INTERNET DRAFT Tom Worster, Ennovate Networks
Network Working Group Avri Doria, Nokia
Standards Track Fiffi Hellstrand, Nortel Networks
Kenneth Sundell, Nortel Networks
Expires June 24th 2000
General Switch Management Protocol
<draft-ietf-gsmp-03.txt>
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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Acknowledgement
GSMP was created by P. Newman, W. Edwards, R. Hinden, E. Hoffman,
F. Ching Liaw, T. Lyon, and G. Minshall (see [6] and [7]). This
version of GSMP is based on their work.
Abstract
This memo provides the third draft of the standards track
specification of GSMP. It is a revision of draft-worster-gsmp-00
which itself was based on GSMP V2 [7].
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Table of Contents
1. Introduction ..................................................... 4
2. GSMP Packet Encapsulation ........................................ 7
3. Common Definitions and Procedures ................................ 8
3.1 GSMP Packet Format ........................................... 9
3.2 Failure Response Messages ................................... 12
4. Connection Management Messages .................................. 18
4.1 General Message Definitions ................................. 18
4.2 Add Branch Message .......................................... 27
4.3 Delete Tree Message ......................................... 29
4.4 Verify Tree Message ......................................... 29
4.5 Delete All Input Port Message ............................... 29
4.6 Delete All Output Port Message .............................. 30
4.7 Delete Branches Message ..................................... 31
4.8 Move Branch Message ......................................... 33
5. Port Management Messages ........................................ 37
5.1 Port Management Message ..................................... 37
5.2 Label Range Message ......................................... 42
6. State and Statistics Messages ................................... 49
6.1 Connection Activity Message ................................. 49
6.2 Statistics Messages ......................................... 52
6.2.1 Port Statistics Message ............................... 56
6.2.2 Connection Statistics Message ......................... 56
6.2.3 QoS Class Statistics Message .......................... 56
6.3 Report Connection State Message ............................. 56
7. Configuration Messages .......................................... 63
7.1 Switch Configuration Message ................................ 63
7.1.1 Configuration Message Processing ...................... 65
7.2 Port Configuration Message .................................. 65
7.2.1 PortType Specific Data ................................ 68
7.3 All Ports Configuration Message ............................. 75
7.4 Service Configuration Message ............................... 77
8. Event Messages .................................................. 82
8.1 Port Up Message ............................................. 83
8.2 Port Down Message ........................................... 83
8.3 Invalid Label Message ....................................... 84
8.4 New Port Message ............................................ 84
8.5 Dead Port Message ........................................... 84
8.6 Adjacency Update Message .................................... 84
9. Service Model Definition ........................................ 85
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9.1 Overview .................................................... 85
9.2 Service Model Definitions ................................... 85
9.2.1 Original Specifications ............................... 86
9.2.2 Service Definition, Traffic Parameters, QoS
Parameters and Traffic Controls ....................... 86
9.2.3 Capability Sets ....................................... 87
9.3 Service Model Procedures .................................... 87
9.4 Service Definitions ......................................... 89
9.4.1 ATM Forum Service Categories .......................... 89
9.4.2 Integrated Services ................................... 94
9.4.3 MPLS CR-LDP ........................................... 94
9.4.4 Frame Relay ........................................... 95
9.4.5 Diff-Serv ............................................. 95
9.5 Format and encoding of the Traffic Parameters Block
in connection management messages .......................... 96
9.5.1 Traffic Parameters for ATM Forum Services ............. 96
9.5.2 Traffic Parameters for the Int-Serv Controlled Load
Service ............................................... 96
9.5.3 Traffic Parameters for the CRLDP Service .............. 97
9.5.4 Traffic Parameters for the Frame Relay Service ........ 98
9.6 Traffic Controls (TC) Flags ................................. 99
10. Reservation Management Messages ............................... 102
10.1 Reservation Request Message ............................... 102
10.2 Delete Reservation Message ................................ 104
10.3 Delete All Reservations Message ........................... 105
11. Adjacency Protocol ............................................ 106
11.1 Packet Format ............................................. 106
11.2 Procedure ................................................. 109
11.3 Partition Information State ............................... 112
11.4 Loss of Synchronisation ................................... 113
11.5 Multiple Controllers per switch partition ................. 113
11.5.1 Multiple Controller Adjacency Process ............... 114
12. Summary of Failure Response Codes ............................. 115
13. Summary of Message Set ........................................ 117
14. Security Considerations ....................................... 119
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1. Introduction
The General Switch Management Protocol (GSMP), is a general
purpose protocol to control a label switch. GSMP allows a
controller to establish and release connections across the switch;
add and delete leaves on a multicast connection; manage switch
ports; request configuration information; and request statistics.
It also allows the switch to inform the controller of asynchronous
events such as a link going down. The GSMP protocol is asymmetric,
the controller being the master and the switch being the slave.
Multiple switches may be controlled by a single controller using
multiple instantiations of the protocol over separate control
connections. Also a switch may be controlled by more than one
controller by using the technique of partitioning.
A "physical" switch can be partitioned into several virtual
switches which are referred to as partitions. In this version of
GSMP switch partitioning is static and occurs prior to running
GSMP. The partitions of a physical switch are isolated from each
other by the implementation and the controller assumes that the
resources allocated to a partition are at all times available to
that partition. A partition appears to its controller as a label
switch. Throughout the rest of this document, the term switch (or
equivalently, label switch) is used to refer to either a physical,
unpartitioned switch or to a partition. The resources allocated to
a partition appear to the controller as if they were the actual
physical resources of the partition. For example if the bandwidth
of a port is divided among several partitions, each partition
would appear to the controller to have its own independent port.
GSMP controls a partitioned switch through the use of a partition
identifier which is carried in every GSMP message. Each partition
has a one-to-one control relationship with its own logical
controller entity (which in the remainder of the document is
referred to simply as a controller) and GSMP independently
maintains adjacency between each controller-partition pair.
GSMP may be transported in three ways:
- GSMP may run across an ATM link connecting the controller
to the switch, on a control connection (virtual channel)
established at initialisation.
- GSMP operation across an Ethernet link is specified.
- GSMP operation across an IP network is specified.
A label switch is a frame or cell switch that supports connection
oriented switching using the exact match forwarding algorithm
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based on labels attached to incoming cells or frames. A switch is
assumed to contain multiple "ports". Each port is a combination of
one "input port" and one "output port". Some GSMP requests refer
to the port as a whole whereas other requests are specific to the
input port or the output port. Cells or labelled frames arrive at
the switch from an external communication link on incoming
labelled channels at an input port. Cells or labelled frames
depart from the switch to an external communication link on
labelled channels from an output port.
A switch may support multiple label types, however, each switch
port can support only one label type. The label type supported by
a given port is indicated by the switch to the controller in a
port configuration message. Connections may be established between
ports supporting different label types. Label types include ATM,
Frame Relay and MPLS Generic Labels.
A connection across a switch is formed by connecting an incoming
labelled channel to one or more outgoing labelled channels.
Connections are referenced by the input port on which they arrive
and the Labels values of their incoming labelled channel.
GSMP supports point-to-point and point-to-multipoint connections.
A multipoint-to-point connection is specified by establishing
multiple point-to-point connections each of them specifying the
same output branch. A multipoint-to-multipoint connection is
specified by establishing multiple point-to-multipoint trees each
of them specifying the same output branches.
In general a connection is established with a certain quality of
service (QoS). This version of GSMP includes a default QoS
Configuration and additionally allows the negotiation of
alternative, optional QoS configurations. The default QoS
Configuration includes three QoS Models: a Service Model, a Simple
Abstract Model (strict priorities) and a QoS Profile Model.
The Service Model is based on service definitions found external
to GSMP such as in Integrated Services or ATM Service Categories.
Each connection is assigned a specific service that defines the
handling of the connection by the switch. Additionally, traffic
parameters and traffic controls may be assigned to the connection
depending on the assigned service.
In the Simple Abstract Model a connection is assigned a priority
when it is established. It may be assumed that for connections
that share the same output port, an cell or frame on a connection
with a higher priority is much more likely to exit the switch
before a cell or frame on a connection with a lower priority if
they are both in the switch at the same time. The number of
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priorities that each port of the switch supports may be obtained
from the port configuration message.
The QoS Profile Model provides a simple mechanism that allows
connection to be assigned QoS semantics defined external to GSMP.
All GSMP switches must support the default QoS Configuration. A
GSMP switch may additionally support one or more alternative QoS
Configurations. The QoS models of alternative QoS configurations
are defined outside the GSMP specification. GSMP includes a
negotiation mechanism that allows a controller to select form the
QoS configurations that a switch supports.
GSMP contains an adjacency protocol. The adjacency protocol is
used to synchronise state across the link, to negotiate which
version of the GSMP protocol to use, to discover the identity of
the entity at the other end of a link, and to detect when it
changes.
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2. GSMP Packet Encapsulation
GSMP packets may be transported via any suitable medium. GSMP
packet encapsulations for ATM, Ethernet and TCP are specified in
[15]. Additional encapsulations for GSMP packets may be defined in
separate documents.
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3. Common Definitions and Procedures
GSMP is a master-slave protocol. The controller issues request
messages to the switch. Each request message indicates whether a
response is required from the switch and contains a transaction
identifier to enable the response to be associated with the
request. The switch replies with a response message indicating
either a successful result or a failure. There are five classes of
GSMP request-response message: Connection Management, Port
Management, State and Statistics, Configuration, and Quality of
Service. The switch may also generate asynchronous Event messages
to inform the controller of asynchronous events. The controller
does not acknowledge event messages. There is also an adjacency
protocol message used to establish synchronisation across the link
and maintain a handshake.
For the request-response messages, each message type has a format
for the request message and a format for the success response.
Unless otherwise specified a failure response message is identical
to the request message that caused the failure, with the Code
field indicating the nature of the failure. Event messages have
only a single format defined as they are not acknowledged by the
controller.
Switch ports are described by a 32-bit port number. The switch
assigns port numbers and it may typically choose to structure the
32 bits into subfields that have meaning to the physical structure
of the switch (e.g. slot, port). In general, a port in the same
physical location on the switch will always have the same port
number, even across power cycles. The internal structure of the
port number is opaque to the GSMP protocol. However, for the
purposes of network management such as logging, port naming, and
graphical representation, a switch may declare the physical
location (physical slot and port) of each port. Alternatively,
this information may be obtained by looking up the product
identity in a database.
Each switch port also maintains a port session number assigned by
the switch. A message, with an incorrect port session number must
be rejected. This allows the controller to detect a link failure
and to keep state synchronised.
Except for the adjacency protocol message, no GSMP messages may be
sent across the link until the adjacency protocol has achieved
synchronisation, and all GSMP messages received on a link that
does not currently have state synchronisation must be discarded.
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3.1 GSMP Packet Format
All GSMP messages, except the adjacency protocol message, have the
following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SubMessage Number | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Message Body ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
(The convention in the documentation of Internet Protocols [5] is
to express numbers in decimal. Numbers in hexadecimal format are
specified by prefacing them with the characters "0x". Numbers in
binary format are specified by prefacing them with the characters
"0b". Data is pictured in "big-endian" order. That is, fields are
described left to right, with the most significant octet on the
left and the least significant octet on the right. Whenever a
diagram shows a group of octets, the order of transmission of
those octets is the normal order in which they are read in
English. Whenever an octet represents a numeric quantity the left
most bit in the diagram is the high order or most significant bit.
That is, the bit labelled 0 is the most significant bit.
Similarly, whenever a multi-octet field represents a numeric
quantity the left most bit of the whole field is the most
significant bit. When a multi-octet quantity is transmitted, the
most significant octet is transmitted first. This is the same
coding convention as is used in the ATM layer [1] and AAL-5 [2].)
Version The version number of the GSMP protocol being used in
this session. It should be set by the sender of the
message to the GSMP protocol version negotiated by the
adjacency protocol.
Message Type
The GSMP message type. GSMP messages fall into seven
classes: Connection Management, Port Management, State
and Statistics, Configuration, Quality of Service,
Events and messages belonging to an Abstract or Resource
Model (ARM) extension. Each class has a number of
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different message types. In addition, one Message Type
is allocated to the adjacency protocol.
Result
Field in a Connection Management request message, a Port
Management request message, or a Quality of Service
request message is used to indicate whether a response
is required to the request message if the outcome is
successful. A value of "NoSuccessAck" indicates that the
request message does not expect a response if the
outcome is successful, and a value of "AckAll" indicates
that a response is expected if the outcome is
successful. In both cases a failure response must be
generated if the request fails. For Sate and Statistics,
and Configuration request messages, a value of
"NoSuccessAck" in the request message is ignored and the
request message is handled as if the field were set to
"AckAll". (This facility was added to reduce the control
traffic in the case where the controller periodically
checks that the state in the switch is correct. If the
controller does not use this capability, all request
messages should be sent with a value of "AckAll.")
In a response message the result field can have three
values: "Success," "More," and "Failure". The "Success"
and "More" results both indicate a success response. All
messages that belong to the same success response will
have the same Transaction Identifier. The "Success"
result indicates a success response that may be
contained in a single message or the final message of a
success response spanning multiple messages.
"More" in the result indicates that the message, either
request or repsonse, exceeds the maximum transmission
unit of the data link and that one or more further
messages will be sent to complete the success response.
ReturnReceipt is a results field used in Events to
indicate that an acknowledgement is required for the
message. The default for Events Messages is that the
controller will not acknowledge Events. In the case
where a switch requries acknowledgement, it will set the
EventAck flag in the header of the Event Message.
The encoding of the result field is:
NoSuccessAck: Result = 1
AckAll: Result = 2
Success: Result = 3
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Failure: Result = 4
More: Result = 5
ReturnReceipt Result = 6
The Result field is not used in an adjacency protocol
message.
Code
Field gives further information concerning the result in
a response message. It is mostly used to pass an error
code in a failure response but can also be used to give
further information in a success response message or an
event message. In a request message the code field is
not used and is set to zero. In an adjacency protocol
message the Code field is used to determine the function
of the message.
Partition ID
Field used to associate the command with a specific
switch partition. The format of the Partition ID is not
defined in GSMP. If desired, the Partition ID can be
divided into multiple sub-identifiers within a single
partition. For example: the Partition ID could be
subdivided into a 6 bit partition number and a 2 bit
sub-identifier which would allow a switch to support 64
partitions with 4 available IDs per partition.
Transaction Identifier
Used to associate a request message with its response
message. For request messages the controller may select
any transaction identifier. For response messages the
transaction identifier is set to the value of the
transaction identifier from the message to which it is a
response. For event messages the transaction identifier
should be set to zero. The Transaction Identifier is not
used, and the field is not present, in the adjacency
protocol.
SubMessage Number
When a message is segmented because it exceeds the MTU
of the link layer, each segment will include a
submessage number to indicate its position. All messages
in a segmented message, except for the last segment,
will also have the More bit set.
Length
Message length including header.
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The following fields are frequently found in GSMP messages. They
are defined here to avoid repetition.
Port
Gives the port number of the switch port to which the
message applies.
Port Session Number
Each switch port maintains a Port Session Number
assigned by the switch. The port session number of a
port remains unchanged while the port is continuously in
the Available state and the link status is continuously
Up. When a port returns to the Available state after it
has been Unavailable or in any of the Loopback states,
or when the line status returns to the Up state after it
has been Down or in Test, or after a power cycle, a new
Port Session Number must be generated. Port session
numbers should be assigned using some form of random
number.
If the Port Session Number in a request message does not
match the current Port Session Number for the specified
port, a failure response message must be returned with
the Code field indicating, "Invalid port session
number." The current port session number for a port may
be obtained using a Port Configuration or an All Ports
Configuration message.
Any field in a GSMP message that is unused or defined as
"reserved" must be set to zero by the sender and ignored by the
receiver.
It is not an error for a GSMP message to contain additional data
after the end of the Message Body. This is to support development
and experimental purposes. However, the maximum transmission unit
of the GSMP message, as defined by the data link layer
encapsulation, must not be exceeded.
A success response message must not be sent until the requested
operation has been successfully completed.
3.2 Failure Response Messages
[Editor's note: this section will be updated after the Feb 2
editing session. it is all out of whack right now. personally i
think it ought to go to the end of the document.]
A failure response message is formed by returning the request
message that caused the failure with the Result field in the
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header indicating failure (Result = 4) and the Code field giving
the failure code. The failure code specifies the reason for the
switch being unable to satisfy the request message.
If the switch issues a failure response in reply to a request
message, no change should be made to the state of the switch as a
result of the message causing the failure. (For request messages
that contain multiple requests, such as the Delete Branches
message, the
failure response message will specify which requests were
successful and which failed. The successful requests may result in
changed state.)
If the switch issues a failure response it must choose the most
specific failure code according to the following precedence:
Invalid Message
Failure specific to the particular message type (failure code
16). (The meaning of this failure is dependent upon the
particular message type and is specified in the text
defining the message.)
A failure response specified in the text defining the message
type.
Connection Failures
Virtual Path Connection Failures
Multicast Failures
QoS Failures (QoS failures are specified in Section 9.7.)
General Failures
If multiple failures match in any of the following categories, the
one that is listed first should be returned. The following failure
response messages and failure codes are defined:
Invalid Message
3: The specified request is not implemented on this switch.
The Message Type field specifies a message that is not
implemented on the switch or contains a value that is
not defined in the version of the protocol running in
this session of GSMP.
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5: One or more of the specified ports does not exist.
At least one of the ports specified in the message is
invalid. A port is invalid if it does not exist or if
it has been removed from the switch.
4: Invalid Port Session Number.
The value given in the Port Session Number field does
not match the current Port Session Number for the
specified port.
N1: Invalid Partition ID
The value given in the Partition ID field is not legal
for this partition.
Connection Failures
8: The specified connection does not exist.
An operation that expects a connection to be specified
cannot locate the specified connection. A connection
is specified by the input port and input label on
which it arrives. An ATM virtual path connection is
specified by the input port and input VPI on which it
arrives.
9: The specified branch does not exist.
An operation that expects a branch of an existing
connection to be specified cannot locate the specified
branch. A branch of a connection is specified by the
connection it belongs to and the output port and
output label on which it departs. A branch of an ATM
virtual path connection is specified by the virtual
path connection it belongs to and the output port and
output VPI on which it departs.
18: One or more of the specified input VPIs is invalid.
19: One or more of the specified Input Labels is invalid.
20: One or more of the specified output VPIs is invalid.
21: One or more of the specified Output Labels is invalid.
22: Invalid Service Selector field in a Connection Management
message.
The value of the Service Selector field is invalid.
23: Insufficient resources for QoS Profile.
The resources requested by the QoS Profile in the
Service Selector field are not available.
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ATM Virtual Path Connections
24: ATM virtual path switching is not supported on this input
port.
25: Point-to-multipoint ATM virtual path connections are not
supported on either the requested input port or the
requested output port.
One or both of the requested input and output ports is
unable to support point-to-multipoint ATM virtual path
connections.
26: Attempt to add a ATM virtual path connection branch to an
existing virtual channel connection.
It is invalid to mix branches switched as virtual
channel connections with branches switched as ATM
virtual path connections on the same point-to-
multipoint connection.
27: Attempt to add a virtual channel connection branch to an
existing ATM virtual path connection.
It is invalid to mix branches switched as virtual
channel connections with branches switched as ATM
virtual path connections on the same point-to-
multipoint connection.
XX: ATM Virtual path switching is not supported on non-ATM
ports.
One or both of the requested input and output ports is
not an ATM port. ATM virtual path switching is only
supported on ATM ports.
Multicast Failures
10: A branch belonging to the specified point-to-multipoint
connection is already established on the specified
output port and the switch cannot support more than a
single branch of any point-to-multipoint connection on
the same output port.
11: The limit on the maximum number of point-to-multipoint
connections that the switch can support has been
reached.
12: The limit on the maximum number of branches that the
specified point-to-multipoint connection can support
has been reached.
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17: Cannot label each output branch of a point-to-multipoint
tree with a different label.
Some early designs, and some low-cost switch designs,
require all output branches of a multicast connection
to use the same value of Label.
28: Only point-to-point bi-directional connections may be
established.
It is an error to attempt to add an additional output
branch to an existing connection with the bi-
directional flag set.
13: Unable to assign the requested Label value to the
requested branch on the specified point-to-multipoint
connection.
Although the requested Labels are valid, the switch is
unable to support the request using the specified
Label values for some reason not covered by the above
failure responses. This message implies that a valid
value of Label exists that the switch could support.
For example, some switch designs restrict the number
of distinct Label values available to a point-to-
multipoint connection. (Most switch designs will not
require this message.)
14: General problem related to the manner in which point-to-
multipoint is supported by the switch.
Use this message if none of the more specific
multicast failure messages apply. (Most switch designs
will not require this message.)
General Failures
2: Invalid request message.
There is an error in one of the fields of the message
not covered by a more specific failure message.
6: One or more of the specified ports is down.
A port is down if its Port Status is Unavailable.
Connection Management, Connection State, Port
Management, and Configuration operations are permitted
on a port that is Unavailable. Connection Activity and
Statistics operations are not permitted on a port that
is Unavailable and will generate this failure
response. A Port Management message specifying a Take
Down function on a port already in the Unavailable
state will also generate this failure response.
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15: Out of resources.
The switch has exhausted a resource not covered by a
more specific failure message, for example, running
out of memory.
1: Unspecified reason not covered by other failure codes.
The failure message of last resort.
The following failure response messages are only used by the Label
Range message. [Must come back and revise this --ed]
29: Cannot support requested label range.
The following failure response messages are only used by the Set
Transmit Data Rate function of the Port Management
message.
30: The transmit data rate of this output port cannot be
changed.
31: Requested transmit data rate out of range for this output
port.
The following failure response message range is reserved for the
ARM extension:
128-159. These failure response codes will be interpreted
according to definitions provided by the model
description.
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4. Connection Management Messages
4.1 General Message Definitions
Connection management messages are used by the controller to
establish, delete, modify and verify connections across the
switch. The Add Branch, Delete Tree, and Delete All connection
management messages have the following format for both request and
response messages:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reservation ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|B|x|E| Input Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Input Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Selector |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|QMS|x|E| Output Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Output Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Selector |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Under certain conditions (see below) the Add Branch message has
additional, variable length data block appended to the above
message:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TC Flags | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Traffic Parameters Block ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
Input Port
Identifies a switch input port.
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Flags
M: Multicast
Multicast flag is used as a hint for point-to-
multipoint connections in the Add Branch message. It
is not used in any other connection management
messages and in these messages it should be set to
zero. If set, it indicates that the connection is very
likely to be a point-to-multipoint connection. If
zero, it indicates that this connection is very likely
to be a point-to-point connection or is unknown.
The Multicast flag is only used in the Add Branch
message when establishing the first branch of a new
connection. It is not required to be set when
establishing subsequent branches of a point-to-
multipoint connection and on such connections it
should be ignored by the receiver. (On receipt of the
second and subsequent Add Branch messages the receiver
knows that this is a point-to-multipoint connection.)
If it is known that this is the first branch of a
point-to-multipoint connection this flag should be
set. If it is unknown, or if it is known that the
connection is point-to-point this flag should be zero.
The use of this flag is not mandatory. It may be
ignored by the switch. If unused the flag should be
set to zero. Some switches use a different data
structure for point-to-multipoint connections than for
point-to-point connections. This flag avoids the
switch setting up a point-to-point structure for the
first branch of a point-to-multipoint connection which
must immediately be deleted and reconfigured as point-
to-multipoint when the second branch is established.
QMS: QoS Model Selector
The QoS Model Selector is used to specify a QoS Model
for connection. The value of QMS indicates the value in
the Service Selector should be interpreted as a
priority, a QoS profile or a service specification as
shown:
QMS QoS Model Service Selector
--- --------- ----------------
00 Simple Abstract Model Priority
01 QoS Profile Model QoS Profile
10 Service Model Service Specification
11 Optional ARM ARM Specification
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B: Bi-directional
The Bi-directional flag applies only to the Add Branch
message. In all other Connection Management messages it
is not used. It may only be used when establishing a
point- to-point connection. The Bi-directional flag in
an Add Branch message, if set, requests that two
unidirectional connections be established, one in the
forward direction, and one in the reverse direction. It
is equivalent to two Add Branch messages, one specifying
the forward direction, and one specifying the reverse
direction. The forward direction uses the values of
Input Port, Input Label, Output Port and Output Label as
specified in the Add Branch message. The reverse
direction is derived by exchanging the values specified
in the Input Port and Input Label fields, with those of
the Output Port and Output Label fields respectively.
Thus, a connection in the reverse direction arrives at
the input port specified by the Output Port field, on
the label specified by the Output Label field. It
departs from the output port specified by the Input Port
field, on the label specified by the Input Label field.
The Bi-directional flag is simply a convenience to
establish two unidirectional connections in opposite
directions between the same two ports, with identical
Labels, using a single Add Branch message. In all future
messages the two unidirectional connections must be
handled separately. There is no bi-directional delete
message. However, a single Delete Branches message with
two Delete Branch Elements, one for the forward
connection and one for the reverse, may be used.
E: Extension Label
The Extension Label Flag is used to extend the adjacent
label field by inserting, after the adjacent label, an
additional 32 bit word into the message. A 32 bit word
formatted according to the line marked ** in the message
diagram follows the adjacent label field if and only if
the E Flag is set.
x: Unused
Reservation ID
Identifies the reservation that must be deployed for the
branch being added. Reservations are established using
reservation management messages (see Chapter 10). A
value of zero indicates that no Reservation is being
deployed for the branch. If a reservation with a
corresponding Reservation ID exists then the reserved
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resources must be applied to the branch. If the
numerical value of Reservation ID is greater than the
value of Max Reservations (from the Switch Configuration
message), a failure response is returned indicating
"Reservation ID out of Range." If the value of Input
Port differs from the input port specified in the
reservation or if the value of Output Port differs from
the output port specified in the reservation, a failure
response must be returned indicating "Mismatched
reservation ports." If no reservation corresponding to
Reservation ID exists, a failure response must be
returned indicating "Non-existent reservation."
If a valid Reservation ID is specified and the Service
Model is used (i.e. QMS=0b10) then the Traffic
Parameters Block may be omitted from the Add Branch
message indicating that the Traffic Parameters specified
in the corresponding Reservation Request message are
implied.
Input Label
Identifies an incoming labelled channel arriving at the
switch input port indicated by the Input Port field. The
value in the Input Label field must be interpreted
according to the Label Type attribute of the switch
input port indicated by the Input Port field.
Output Port
Identifies a switch output port.
Output Label
Identifies an outgoing labelled channel departing at the
switch output port indicated by the Output Port field.
The value in the Output Label field must be interpreted
according to the Label Type attribute of the switch
input port indicated by the Output Port field
Service Selector
In the default QoS configuration, this field can contain
either a Priority, a QoS Profile Identifier, or a
Service Specification. When using an alternative QoS
configuration, the format and semantics of data within
the field are defined outside of GSMP.
In the default QoS configuration, if the QoS Model
Selector is set to 0b00, the Service Selector field
contains a Priority. If the QoS Model Selector is set to
0b01, the Service Selector field contains a QoS Profile.
If the QoS Model Selector is set to 0b10, the Service
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Selector field contains a Service Specification. If the
QoS Model Selector is set to 0b11, the Service Selector
field contains a service indicator which has its meaning
defined by the optional ARM being used as indicated in
the MType field of the configuration message. The
Service Selector field is only used in the Add Branch
and Move Branch messages.
Priority specifies the priority of the connection for
Add Branch and Move Branch messages that choose not to
use a QoS profile, or a service specification. The
highest priority is numbered zero and the lowest
priority is numbered "Q-1" where "Q" is the number of
priorities that the output port can support. The ability
to offer different qualities of service to different
connections based upon their priority is assumed to be a
property of the output port of the switch. It is assumed
that for connections that share the same output port, a
cell or frame on a connection with a higher priority is
much more likely to exit the switch before a cell or
frame on a connection with a lower priority, if they are
both in the switch at the same time. The number of
priorities that each output port can support is given in
the Port Configuration message. In order to maintain
backward compatibility with earlier versions of GSMP,
the Priority octets will occupy the 2 right-most octets
of the service selector.
A QoS Profile Identifier is an opaque 16-bit value. It
is used to identify a QoS profile in the switch which
specifies the Quality of Service required by the
connection. QoS profiles are established by a mechanism
external to GSMP.
A Service Specification is an alternative method of
communicating the QoS requirements of a connection. The
Service Specification is defined in Chapter 9.
TC Flags TC (Traffic Control) Flags are used in Add Branch
messages for connections using the Service Model (i.e.
when QMS=0b10). The TC Flags field is defined in Section
9.6.
Traffic Parameters Block
This variable length field is used in Add Branch
messages for connections using the Service Model (i.e.
when QMS=0b10). Traffic Parameters Block is defined in
Section 9.5. The Traffic Parameters Block may be omitted
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if a valid, non-zero Reservation ID is specified, in
which case the Traffic Paramaters of the corresponding
Reservation Request message are implied.
For all connection management messages, except the Delete Branches
message, the success response message is a copy of the request
message returned with the Result field indicating success and the
Number of Branches field indicating the number of branches on the
connection after completion of the operation. The Code field is
not used in a connection management success response message.
The failure response message is a copy of the request message
returned with a Result field indicating failure and the Number of
Branches field indicating the number of branches on the
connection.
Fundamentally, no distinction is made between point-to-point and
point-to-multipoint connections. By default, the first Add Branch
message for a particular Input Port and Input Label will establish
a point-to-point connection. The second Add Branch message with
the same Input Port and Input Label fields will convert the
connection to a point-to-multipoint connection with two branches.
However, to avoid possible inefficiency with some switch designs,
the Multicast Flag is provided. If the controller knows that a new
connection is point-to-multipoint when establishing the first
branch, it may indicate this in the Multicast Flag. Subsequent Add
Branch messages with the same Input Port and Input Label fields
will add further branches to the point-to-multipoint connection.
Use of the Delete Branch message on a point-to-multipoint
connection with two branches will result in a point-to-point
connection. However, the switch may structure this connection as a
point-to-multipoint connection with a single output branch if it
chooses. (For some switch designs this structure may be more
convenient.) Use of the Delete Branch message on a point-to-point
connection will delete the point-to-point connection. There is no
concept of a connection with zero output branches. All connections
are unidirectional, one input labelled channel to one or more
output labelled channels.
GSMP supports point-to-point and point-to-multipoint connections.
A multipoint-to-point connection is specified by establishing
multiple point-to-point connections each of them specifying the
same output branch. (An output branch is specified by an output
port and output label.)
Label stacking is a technique used in MPLS that allows
hierarchical labelling. MPLS label stacking is similar to but
subtly different from the VPI/VCI hierarchy of labels in ATM. ...
[Must add blah --Ed]
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The connection management messages may be issued regardless of the
Port Status of the switch port. Connections may be established or
deleted when a switch port is in the Available, Unavailable, or
any of the Loopback states. However, all connection state on an
input port will be deleted when the port returns to the Available
state from any other state, i.e. when a Port Management message is
received for that port with the Function field indicating either
Bring Up, or Reset Input Port.
ATM Labels
If a port's attribute PortType=ATM then that port's labels
must be interpreted as ATM Labels as shown:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ - - -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | VPI | VCI |
+ - - -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
ATM ports do not support Extension Labels so the VPI and
VCI values always occupy the 28 bits following the flags in
a connection management message. For a virtual path
connection (switched as a single virtual path connection)
or a virtual path (switched as one or more virtual channel
connections within the virtual path) the VCI field is not
used.
ATM distinguishes between virtual path connections and
virtual channel connections. The connection management
messages apply both to virtual channel connections and
virtual path connections. The Add Branch and Move Branch
connection management messages have two Message Types. One
Message Type indicates that a virtual channel connection is
required, and the other Message Type indicates that a
virtual path connection is required. The Delete Branches,
Delete Tree, and Delete All connection management messages
have only a single Message Type because they do not need to
distinguish between virtual channel connections and virtual
path connections. For virtual path connections, neither
Input VCI fields nor Output VCI fields are required. They
should be set to zero by the sender and ignored by the
receiver. Virtual channel branches may not be added to an
existing virtual path connection. Conversely, virtual path
branches may not be added to an existing virtual channel
connection. In the Port Configuration message each switch
input port may declare whether it is capable of supporting
virtual path switching (i.e. accepting connection
management messages requesting virtual path connections).
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Frame Relay Labels
If a port's attribute PortType=FR then that port's labels
must be interpreted as Frame Relay Labels as shown:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+- - - -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |Resv.|Len| DLCI |
+- - - -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Len field specifies the number of bits of the DLCI. The
following values are supported:
Len DLCI bits
0 10
1 17
2 23
DLCI is the binary value of the Frame Relay Label. The
significant number of bits (10, 17, or 23) of the label
value are to be encoded into the Data Link Connection
Identifier (DLCI) field when part of the Frame Relay data
link header [13].
Frame relay ports do not support Extension Labels so the
Len and DLCI values should be right justified with the
Resv. bits set to zero in the 28 bits Label field following
the flags in a connection management message.
MPLS Generic Labels
If a port's attribute PortType=MPLS then that port's labels
are for use on links for which label values are independent
of the underlying link technology. Example of such links
are PPP and Ethernet. On such links the labels are carried
in MPLS label stacks [14]. The labels for this PortType
must be interpreted as MPLS labels as shown:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ - - - - - - - - - - -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | MPLS Label |
+ - - - - - - - - - - -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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MPLS Label
This is a 20-bit label value as specified in [14]
represented as a 20-bit number in a 4 byte field.
4.2 Add Branch Message
The Add Branch message is a connection management message used to
establish a connection or to add an additional branch to an
existing connection. It may also be used to check the connection
state stored in the switch. The connection is specified by the
Input Port and Input Label fields. The output branch is specified
by the Output Port and Output Label fields. The quality of service
requirements of the connection are specified by the QoS Model
Selector and Service Selector fields. To request a connection the
Add Branch message is:
Message Type = 16
If the connection specified by the Input Port and Input Label
fields does not already exist, it must be established with the
single output branch specified in the request message. If the Bi-
directional Flag in the Flags field is set, the reverse connection
must also be established. The output branch should have the QoS
attributes specified by the Class of Service field.
If the connection specified by the Input Port and Input Label
fields already exists, but the specified output branch does not,
the new output branch must be added. The new output branch should
have the QoS attributes specified by the Class of Service field.
If the connection specified by the Input Port and Input Label
fields already exists and the specified output branch also already
exists, the QoS attributes of the connection, specified by the
Class of Service field, if different from the request message,
should be changed to that in the request message. A success
response message must be sent if the Result field of the request
message is "AckAll". This allows the controller to periodically
reassert the state of a connection or to change its priority. If
the result field of the request message is "NoSuccessAck" a
success response message should not be returned. This may be used
to reduce the traffic on the control link for messages that are
reasserting previously established state. For messages that are
reasserting previously established state, the switch must always
check that this state is correctly established in the switch
hardware (i.e. the actual connection tables used to forward cells
or frames).
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If the output branch specified by the Output Port and Output Label
fields is already in use by any connection other than that
specified by the Input Port and Input Label fields, then the
resulting output branch will have multiple input branches. If
multiple point-to-point connections share the same output branch
the result will be a multipoint-to-point connection.
If the connection specified by the Input Port and Input Label
fields already exists, and the Bi-directional Flag in the Flags
field is set, a failure response must be returned indicating:
"Only point-to-point bi-directional connections may be
established."
It should be noted that different switches support multicast in
different ways. There will be a limit to the total number of
point- to-multipoint connections any switch can support, and
possibly a limit on the maximum number of branches that a point-
to-multipoint connection may specify. Some switches also impose a
limit on the number of different Label values that may be assigned
to the output branches of a point-to-multipoint connection. Many
switches are incapable of supporting more than a single branch of
any particular point-to-multipoint connection on the same output
port. Specific failure codes are defined for some of these
conditions.
ATM specific procedures:
To request an ATM virtual path connection the ATM Virtual
Path Connection (VPC) Add Branch message is:
Message Type = 26
An ATM virtual path connection can only be established
between ATM ports, i.e. ports with the "ATM" Label Type
attribute. If an ATM VPC Add Branch message is received and
either the switch input port specified by the Input Port
field or the switch output port specified by the Output
Port field is not an ATM port, a failure response message
must be returned indicating, "Virtual path switching is not
supported on non-ATM ports."
If an ATM VPC Add Branch message is received and the switch
input port specified by the Input Port field does not
support virtual path switching, a failure response message
must be returned indicating, "Virtual path switching is not
supported on this input port."
If an ATM virtual path connection already exists on the
virtual path specified by the Input Port and Input VPI
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fields, a failure response message must be returned
indicating, "Attempt to add a virtual channel connection
branch to an existing virtual path connection." For the VPC
Add Branch message, if a virtual channel connection already
exists on any of the virtual channels within the virtual
path specified by the Input Port and Input VPI fields, a
failure response message must be returned indicating,
"Attempt to add a virtual path connection branch to an
existing virtual channel connection."
4.3 Delete Tree Message
The Delete Tree message is a connection management message used to
delete an entire connection. All remaining branches of the
connection are deleted. A connection is specified by the Input
Port and Input Label fields. The Output Port and Output Label
fields are not used in this message. The Delete Tree message is:
Message Type = 18
If the Result field of the request message is "AckAll" a success
response message must be sent upon successful deletion of the
specified connection. The success message must not be sent until
the delete operation has been completed and if possible, not until
all data on the connection, queued for transmission, has been
transmitted. The Number of Branches field is not used in either
the request or response messages of the Delete Tree message.
4.4 Verify Tree Message
The Verify Tree message has been removed from this version of
GSMP. Its function has been replaced by the Number of Branches
field in the success response to the Add Branch message which
contains the number of branches on a connection after successful
completion of an add branch operation.
Message Type = 19 is reserved.
If a request message is received with Message Type = 19 a failure
response must be returned with the Code field indicating: "The
specified request is not implemented in this version of the
protocol."
4.5 Delete All Input Port Message
The Delete All Input Port message is a connection management
message used to delete all connections on a switch input port All
connections that arrive at the specified input port must be
deleted. On completion of the operation all dynamically assigned
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Label values for the specified port must be unassigned, i.e. there
must be no connections established in the Label space that GSMP
controls on this port. The Service Selectors, Output Port, Input
Label and Output Label fields are not used in this message. The
Delete All Input Port message is:
Message Type = 20
If the Result field of the request message is "AckAll" a success
response message must be sent upon completion of the operation.
The Number of Branches field is not used in either the request or
response messages of the Delete All Input Port message. The
success response message must not be sent until the operation has
been completed.
The following failure response messages may be returned to a
Delete All Input Port request.
The specified request is not implemented on this switch.
One or more of the specified ports does not exist.
Invalid Port Session Number.
If any field in a Delete All Input Port message not covered by the
above failure codes is invalid, a failure response must be
returned indicating: "Invalid request message." Else, the Delete
All Input Port operation must be completed successfully and a
success message returned. No other failure messages are permitted.
4.6 Delete All Output Port Message
The Delete All message is a connection management message used to
delete all connections on a switch input port. All connections
that have the specified output port must be deleted. On
completion of the operation all dynamically assigned Label values
for the specified port must be unassigned, i.e. there must be no
connections established in the Label space that GSMP controls on
this port. The Service Selectors, Input Port, Input Label and
Output Label fields are not used in this message. The Delete All
Output Port message is:
Message Type = 21
If the Result field of the request message is "AckAll" a success
response message must be sent upon completion of the operation.
The Number of Branches field is not used in either the request or
response messages of the Delete All Output Port message. The
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success response message must not be sent until the operation has
been completed.
The following failure response messages may be returned to a
Delete All Output Port request.
The specified request is not implemented on this switch.
One or more of the specified ports does not exist.
Invalid Port Session Number.
If any field in a Delete All Output Port message not covered by
the above failure codes is invalid, a failure response must be
returned indicating: "Invalid request message." Else, the delete
all operation must be completed successfully and a success message
returned. No other failure messages are permitted.
4.7 Delete Branches Message
The Delete Branches message is a connection management message
used to request one or more delete branch operations. Each delete
branch operation deletes a branch of a channel, or in the case of
the last branch of a connection, it deletes the connection. The
Delete Branches message is:
Message Type = 17
The request message has the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Number of Elements |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Delete Branch Elements ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Number of Elements
Specifies the number of Delete Branch Elements to follow
in the message. The number of Delete Branch Elements in
a Delete Branches message must not cause the packet
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length to exceed the maximum transmission unit defined
by the encapsulation.
Each Delete Branch Element specifies an output branch to be
deleted and has the following structure:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x|I|O| |
+-+-+-+-+ Input Label ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Error | |
+-+-+-+-+ Output Label ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
I: Input Extension Label
The Input Extension Label flag if zero indicates that
the Input Label field is a 28 bit field. If the Input
Extension Label flag is set then the Input Label field
is a 60 bit field structured as a 28 bit first level
label field followed by a 32 bit second level label
field.
O: Output Extension Label
The Output Extension Label flag if zero indicates that
the Output Label field is a 28 bit field. If the Output
Extension Label flag is set then the Output Label field
is a 60 bit field structured as a 28 bit first level
label field followed by a 32 bit second level label
field.
Error
Is used to return a failure code indicating the reason
for the failure of a specific Delete Branch Element in a
Delete Branches failure response message. The Error
field is not used in the request message and must be set
to zero. A value of zero is used to indicate that the
delete operation specified by this Delete Branch Element
was successful. Values for the other failure codes are
specified in Section 3.2, "Failure Response Messages."
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All other fields of the Delete Branch Element have the
same definition as specified for the other connection
management messages.
In each Delete Branch Element, a connection is specified by the
Input Port and Input Label fields. The specific branch to be
deleted is indicated by the Output Port and Output Label fields.
If the Result field of the Delete Branches request message is
"AckAll" a success response message must be sent upon successful
deletion of the branches specified by all of the Delete Branch
Elements. The success response message must not be sent until all
of the delete branch operations have been completed. The success
response message is only sent if all of the requested delete
branch operations were successful. No Delete Branch Elements are
returned in a Delete Branches success response message and the
Number of Elements field must be set to zero.
If there is a failure in any of the Delete Branch Elements a
Delete Branches failure response message must be returned. The
Delete Branches failure response message is a copy of the request
message with the Code field of the entire message set to, "Failure
specific to the particular message type," and the Error field of
each Delete Branch Element indicating the result of each requested
delete operation. A failure in any of the Delete Branch Elements
must not interfere with the processing of any other Delete Branch
Elements.
4.8 Move Branch Message
The Move Branch message is used to move a branch of an existing
connection from its current output port label to a new output port
label in a single atomic transaction. The Move Branch connection
management message has the following format for both request and
response messages:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x|x|E| Input Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Input Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Selector |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Old Output Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x|E| Old Output Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Old Output Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| New Output Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|QMS|x|E| New Output Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended New Output Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Selector |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
The E, QMS and Service Selector fields are as defined in the Add
Branch message.
The Move Branch message is a connection management message used to
move a single output branch of connection from its current output
port and Output Label, to a new output port and Output Label on
the same connection. None of the connection's other output
branches are modified. When the operation is complete the original
Output Label on the original output port will be deleted from the
connection.
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The Move Branch message is:
Message Type = 22
For the Move Branch message, if the connection specified by the
Input Port and Input Label fields already exists, and the output
branch specified by the Old Output Port and Old Output Label
fields exists as a branch on that connection, the output branch
specified by the New Output Port and New Output Label fields is
added to the connection and the branch specified by the Old Output
Port and Old Output Label fields is deleted. If the Result field
of the request message is "AckAll" a success response message must
be sent upon successful completion of the operation. The success
response message must not be sent until the Move Branch operation
has been completed.
For the Move Branch message, if the connection specified by the
Input Port and Input Label fields already exists, but the output
branch specified by the Old Output Port and Old Output Label
fields does not exist as a branch on that connection, a failure
response must be returned with the Code field indicating, "The
specified branch does not exist."
For the Move Branch message, if the connection specified by the
Input Port and Input Label fields already exists, and the output
branch specified by the Old Output Port and Old Output Label
fields exists as a branch on that connection, the output branch
specified by the New Output Port and New Output Label fields is
added to the connection and the branch specified by the Old Output
Port and Old Output Label fields is deleted. If the Result field
of the request message is "AckAll" a success response message must
be sent upon successful completion of the operation. The success
response message must not be sent until the Move Branch operation
has been completed.
ATM Specific Procedures:
The ATM VPC Move Branch message is a connection management
message used to move a single output branch of a virtual
path connection from its current output port and output
VPI, to a new output port and output VPI on the same
virtual channel connection. None of the other output
branches are modified. When the operation is complete the
original output VPI on the original output port will be
deleted from the connection.
The VPC Move Branch message is:
Message Type = 27
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For the VPC Move Branch message, if the virtual path
connection specified by the Input Port and Input VPI fields
already exists, and the output branch specified by the Old
Output Port and Old Output VPI fields exists as a branch on
that connection, the output branch specified by the New
Output Port and New Output VPI fields is added to the
connection and the branch specified by the Old Output Port
and Old Output VPI fields is deleted. If the Result field
of the request message is "AckAll" a success response
message must be sent upon successful completion of the
operation. The success response message must not be sent
until the Move Branch operation has been completed.
For the VPC Move Branch message, if the virtual path
connection specified by the Input Port and Input VPI fields
already exists, but the output branch specified by the Old
Output Port and Old Output VPI fields does not exist as a
branch on that connection, a failure response must be
returned with the Code field indicating, "The specified
branch does not exist."
If the virtual channel connection specified by the Input
Port and Input Label fields; or the virtual path connection
specified by the Input Port and Input VPI fields; does not
exist, a failure response must be returned with the Code
field indicating, "The specified connection does not
exist."
If the output branch specified by the New Output Port, New
Output VPI, and New Output VCI fields for a virtual channel
connection; or the output branch specified by the New
Output Port and New Output VPI fields for a virtual path
connection; is already in use by any connection other than
that specified by the Input Port and Input Label fields
then the resulting output branch will have multiple input
branches. If multiple point-to-point connections share the
same output branch the result will be a multipoint-to-point
connection. If multiple point-to-multipoint trees share the
same output branches the result will be a multipoint-to-
multipoint connection.
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5. Port Management Messages
5.1 Port Management Message
The Port Management message allows a port to be brought into
service, taken out of service, looped back, reset, or the transmit
data rate changed. Only the Bring Up and the Reset Input Port
functions change the connection state (established connections) on
the input port. Only the Bring Up function changes the value of
the Port Session Number. The port event message is also used as
part of the Event Message flow control mechanism.
If the Result field of the request message is "AckAll" a success
response message must be sent upon successful completion of the
operation. The success response message must not be sent until the
operation has been completed. The Port Management Message is:
Message Type = 32
The Port Management message has the following format for the
request and success response messages:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Event Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Duration | Function |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Event Flags | Flow Control Flags |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transmit Data Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Event Sequence Number
In the success response message gives the current value
of the Event Sequence Number of the switch port
indicated by the Port field. The Event Sequence Number
is set to zero when the port is initialised. It is
incremented by one each time the port detects an
asynchronous event that the switch would normally report
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via an Event message. If the Event Sequence Number in
the success response differs from the Event Sequence
Number of the most recent Event message received for
that port, events have occurred that were not reported
via an Event message. This is most likely to be due to
the flow control that restricts the rate at which a
switch can send Event messages for each port. In the
request message this field is not used.
Duration Is the length of time, in seconds, that any of the
loopback states remain in operation. When the duration
has expired the port will automatically be returned to
service. If another Port Management message is received
for the same port before the duration has expired, the
loopback will continue to remain in operation for the
length of time specified by the Duration field in the
new message. The Duration field is only used in request
messages with the Function field set to Internal
Loopback, External Loopback, or Bothway Loopback.
Function Specifies the action to be taken. The specified action
will be taken regardless of the current status of the
port (Available, Unavailable, or any Loopback state). If
the specified function requires a new Port Session
Number to be generated, the new Port Session Number must
be returned in the success response message. The defined
values of the Function field are:
Bring Up:
Function = 1. Bring the port into service. All
connections that arrive at the specified input port
must be deleted and a new Port Session Number must
be selected using some form of random number. On
completion of the operation all dynamically
assigned Label values for the specified input port
must be unassigned, i.e. no connections will be
established in the Label space that GSMP controls
on this input port. The Port Status of the port
afterwards will be Available.
Take Down:
Function = 2. Take the port out of service. Any
data received at this port will be discarded. No
data will be transmitted from this port. The Port
Status of the port afterwards will be Unavailable.
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The behaviour is undefined if the port is taken
down over which the GSMP session that controls the
switch is running. (In this case the most probable
behaviour would be for the switch either to ignore
the message or to terminate the current GSMP
session and to initiate another session, possibly
with the backup controller, if any.) The correct
method to reset the link over which GSMP is running
is to issue an RSTACK message in the adjacency
protocol.
Internal Loopback:
Function = 3. Data arriving at the output port from
the switch fabric are looped through to the input
port to return to the switch fabric. All of the
functions of the input port above the physical
layer, e.g. header translation, are performed upon
the looped back data. The Port Status of the port
afterwards will be Internal Loopback.
External Loopback:
Function = 4. Data arriving at the input port from
the external communications link are immediately
looped back to the communications link at the
physical layer without entering the input port.
None of the functions of the input port above the
physical layer are performed upon the looped back
data. The Port Status of the port afterwards will
be External Loopback.
Bothway Loopback:
Function = 5. Both internal and external loopback
are performed. The Port Status of the port
afterwards will be Bothway Loopback.
Reset Input Port:
Function = 6. All connections that arrive at the
specified input port must be deleted and the input
and output port hardware re-initialised. On
completion of the operation all dynamically
assigned Label values for the specified input port
must be unassigned, i.e. no connections will be
established in the Label space that GSMP controls
on this input port. The range of labels that may be
controlled by GSMP on this port will be set to the
default values specified in the Port Configuration
message. The transmit data rate of the output port
must be set to its default value. The Port Session
Number is not changed by the Reset Input Port
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function. The Port Status of the port afterwards
will be Unavailable.
Reset Flags:
Function = 7. This function is used to reset the
Event Flags and Flow Control Flags. For each bit
that is set in the Event Flags field, the
corresponding Event Flag in the switch port must be
reset to 0. For each bit that is set in the Flow
Control Flags field, the corresponding Flow Control
Flag in the switch port must toggled; i.e. flow
control for the corresponding event is turned off
if is currently on and it is turned on if it is
currently off. The Port Status of the port is not
changed by this function.
Set Transmit Data Rate:
Function = 8. Sets the transmit data rate of the
output port as close as possible to the rate
specified in the Transmit Data Rate field. In the
success response message the Transmit Data Rate
must indicate the actual transmit data rate of the
output port. If the transmit data rate of the
requested output port cannot be changed, a failure
response must be returned with the Code field
indicating: "The transmit data rate of this output
port cannot be changed." If the transmit data rate
of the requested output port can be changed, but
the value of the Transmit Data Rate field is beyond
the range of acceptable values, a failure response
must be returned with the Code field indicating:
"Requested transmit data rate out of range for this
output port." In the failure response message the
Transmit Data Rate must contain the same value as
contained in the request message that caused the
failure. The transmit data rate of the output port
is not changed by the Bring Up, Take Down, or any
of the Loopback functions. It is returned to the
default value by the Reset Input Port function.
Transmit Data Rate
This field is only used in request and success response
messages with the Function field set to "Set Transmit
Data Rate." It is used to set the output data rate of
the output port. It is specified in cells or frames/s.
If the Transmit Data Rate field contains the value
0xFFFFFFFF the transmit data rate of the output port
should be set to the highest valid value.
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Event Flags
Field in the request message is used to reset the Event
Flags in the switch port indicated by the Port field.
Each Event Flag in a switch port corresponds to a type
of Event message. When a switch port sends an Event
message it sets the corresponding Event Flag on that
port. Depending on the setting in the Flow Control Flag,
a port is either subject to flow control or not. If it
is subject to flow control then it is not permitted to
send another Event message of the same type before the
Event Flag has been reset. To reset an event flag, the
Function field in the request message is set to "Reset
Flags." For each bit that is set in the Event Flags
field, the corresponding Event Flag in the switch port
is reset.
The Event Flags field is only used in a request message
with the Function field set to "Reset Event Flags." For
all other values of the Function field, the Event Flags
field is not used. In the success response message the
Event Flags field must be set to the current value of
the Event Flags for the port, after the completion of
the operation specified by the request message, for all
values of the Function field. Setting the Event Flags
field to all zeros in a "Reset Event Flags" request
message allows the controller to obtain the current
state of the Event Flags and the current Event Sequence
Number of the port without changing the state of the
Event Flags.
The correspondence between the types of Event message
and the bits of the Event Flags field is as follows:
1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|U|D|I|N|Z|A|x x x x x x x x x x|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
U: Port Up Bit 0, (most significant bit)
D: Port Down Bit 1,
I: Invalid Label Bit 2,
N: New Port Bit 3,
Z: Dead Port Bit 4,
A: Adjacency Event Bit 5,
x: Unused Bits 6--15.
Flow Control Flags Field
This flags in this field are used to indicate whether
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the flow control mechanism described in the Events Flag
field is turned on or not. If the Flow Control Flag is
on, then the flow control mechanism for that event on
that port is activated. To toggle flow control, the
Function field in the request message is set to "Reset
Flags." For each bit that is set in the Flow Control
Flags field, the flow control corresponding Event in the
switch port is toggled.
The correspondence between the Flow Control applied to
the Events messages and the bits of the flow Control
Flags field is as follows:
1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|U|D|I|N|Z|A|x x x x x x x x x x|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
U: Port Up Bit 0, (most significant bit)
D: Port Down Bit 1,
I: Invalid Label Bit 2,
N: New Port Bit 3,
Z: Dead Port Bit 4,
A: Adjacency Event Bit 5,
x: Unused Bits 6--15.
5.2 Label Range Message
The default label range, Min Label to Max Label, is specified for
each port by the Port Configuration or the All Ports Configuration
messages. When the protocol is initialised, before the
transmission of any Label Range messages, the label range of each
port will be set to the default label range. (The default label
range is dependent upon the switch design and configuration and is
not specified by the GSMP protocol.) The Label Range message
allows the range of labels supported by a specified port, to be
changed. Each switch port must declare whether it supports the
Label Range message in the Port Configuration or the All Ports
Configuration messages. The Label Range message is:
Message Type = 33
The Label Range message has the following format for the request
and success response messages:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|V|x x| Min Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x x| Max Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Remaining Labels |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Flags
Q: Query
If the Query flag is set in a request message, the
switch must respond with the current range of valid
labels. The current label range is not changed by a
request message with the Query flag set. If the Query
flag is zero, the message is requesting a label change
operation.
V: Label
The Label flag use is port type specific.
x: Unused
The success response to a Label Range message requesting a change
of label range is a copy of the request message with the Remaining
Label Range fields updated to the new values after the Label Range
operation.
If the switch is unable to satisfy a request to change the Label
range, it must return a failure response message with the Code
field set to "Cannot support requested label range." In this
failure response message the switch must use the Min Label and Max
Label fields to suggest a label range that it would be able to
satisfy.
A Label Range request message may be issued regardless of the Port
Status or the Line Status of the target switch port. If the Port
field of the request message contains an invalid port (a port that
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does not exist or a port that has been removed from the switch) a
failure response message must be returned with the Code field set
to, "One or more of the specified ports does not exist."
If the Query flag is set in the request message, the switch must
reply with a success response message containing the current range
of valid labels that are supported by the port. The Min Label and
Max Label fields are not used in the request message.
ATM Labels:
If PortType=ATM the label range fields have following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|V|x x| Min VPI | Min VCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x x| Max VPI | Max VCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Remaining VPIs | Remaining VCIs |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
V: Label If the Label flag is set, the message refers to a range
of VPIs only. The Min VCI and Max VCI fields are unused.
If the Label flag is zero the message refers to a range
of VCIs on either one VPI or on a range of VPIs.
Min VPI
Max VPI Specify a range of VPI values, Min VPI to Max VPI
inclusive. A single VPI may be specified with a Min VPI
and a Max VPI having the same value. In a request
message, if the value of the Max VPI field is less than
or equal to the value of the Min VPI field, the
requested range is a single VPI with a value equal to
the Min VPI field. Zero is a valid value. In a request
message, if the Query flag is set, and the Label flag is
zero, the Max VPI field specifies a single VPI and the
Min VPI field is not used. The maximum valid value of
these fields for both request and response messages is
0xFFF.
Min VCI
Max VCI Specify a range of VCI values, Min VCI to Max VCI
inclusive. A single VCI may be specified with a Min VCI
and a Max VCI having the same value. In a request
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message, if the value of the Max VCI field is less than
or equal to the value of the Min VCI field, the
requested range is a single VCI with a value equal to
the Min VCI field. Zero is a valid value. (However,
VPI=0, VCI=0 is not available as a virtual channel
connection as it is used as a special value in ATM to
indicate an unassigned cell.)
Remaining VPIs
Remaining VCIs
These fields are unused in the request message. In the
success response message and in the failure response
message these fields give the maximum number of
remaining VPIs and VCIs that could be requested for
allocation on the specified port (after completion of
the requested operation in the case of the success
response). It gives the switch controller an idea of how
many VPIs and VCIs it could request. The number given is
the maximum possible given the constraints of the switch
hardware. There is no implication that this number of
VPIs and VCIs is available to every switch port.
If the Query flag and the Label flag are set in the request
message, the switch must reply with a success response message
containing the current range of valid VPIs that are supported by
the port. The Min VPI and Max VPI fields are not used in the
request message.
If the Query flag is set and the Label flag is zero in the request
message, the switch must reply with a success response message
containing the current range of valid VCIs that are supported by
the VPI specified by the Max VPI field. If the requested VPI is
invalid, a failure response must be returned indicating: "One or
more of the specified input VPIs is invalid." The Min VPI field is
not used in either the request or success response messages.
If the Query flag is zero and the Label flag is set in the request
message, the Min VPI and Max VPI fields specify the new range of
VPIs to be allocated to the input port specified by the Port
field. Whatever the range of VPIs previously allocated to this
port it should be increased or decreased to the specified value.
If the Query flag and the Label flag are zero in the request
message, the Min VCI and Max VCI fields specify the range of VCIs
to be allocated to each of the VPIs specified by the VPI range.
Whatever the range of VCIs previously allocated to each of the
VPIs within the specified VPI range on this port, it should be
increased or decreased to the specified value. The allocated VCI
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range must be the same on each of the VPIs within the specified
VPI range.
If the switch is unable to satisfy a request to change the label
range, it must return a failure response message with the Code
field set to "Cannot support requested label range." If the switch
is unable to satisfy a request to change the VPI the switch must
use the Min VPI and Max VPI fields to suggest a VPI range that it
would be able to satisfy and set the VCI fields to zero or if the
switch is unable to satisfy a request to change the VCI range on
all VPIs within the requested VPI range, the switch must use the
Min VPI, Max VPI, Min VCI, and Max VCI fields to suggest a VPI and
VCI range that it would be able to satisfy.
In all other failure response messages for the label range
operation the switch must return the values of Min VPI, Max VPI,
Min VCI, and Max VCI from the request message.
While switches can typically support all 256 or 4096 VPIs the VCI
range that can be supported is often more constrained. Often the
Min VCI must be 0 or 32. Typically all VCIs within a particular
VPI must be contiguous. The hint in the failure response message
allows the switch to suggest a label range that it could satisfy
in view of its particular architecture.
While the Label Range message is defined to specify both a range
of VPIs and a range of VCIs within each VPI, the most likely use
is to change either the VPI range or the range of VCIs within a
single VPI. It is possible for a VPI to be valid but to be
allocated no valid VCIs. Such a VPI could be used for a virtual
path connection but to support virtual channel connections it
would need to be allocated a range of VCIs.
Frame Relay Labels:
If PortType=FR the label range fields have following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|V|x x|x x|Len| Min DLCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x x x x x x| Max DLCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Remaining DLCIs |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
V: Label The Label flag is not used.
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Len
This field specifies the number of bits of the DLCI. The
following values are supported:
Len DLCI bits
0 10
1 17
2 23
Min DLCI
Max DLCI Specify a range of DLCI values, Min DLCI to Max DLCI
inclusive. The values should be right justified in the
23 bit fields and the preceding bits should be set to
zero. A single DLCI may be specified with a Min DLCI and
a Max DLCI having the same value. In a request message,
if the value of the Max DLCI field is less than or equal
to the value of the Min DLCI field, the requested range
is a single DLCI with a value equal to the Min DLCI
field. Zero is a valid value.
Remaining DLCIs
This field is unused in the request message. In the
success response message and in the failure response
message this field gives the maximum number of remaining
DLCIs that could be requested for allocation on the
specified port (after completion of the requested
operation in the case of the success response). It gives
the switch controller an idea of how many DLCIs it could
request. The number given is the maximum possible given
the constraints of the switch hardware. There is no
implication that this number of DLCIs is available to
every switch port.
MPLS Generic Labels:
The Label Range field for PortTypes using MPLS labels (e.g.
Ethernet, SONET etc.) has the following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x x x x x x x x x x| Min MPLS Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x x x x x x x x x x| Max MPLS Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Remaining MPLS Labels |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Min MPLS Label:
Max MPLS Label:
Specify a range of MPLS label values, Min MPLS Label to
Max MPLS Label inclusive. The Max and Min MPLS label
fields are 20 bits each.
Remaining MPLS Labels:
This field is unused in the request message. In the
success response message and in the failure response
message this field gives the maximum number of remaining
MPLS Labels that could be requested for allocation on
the specified port (after completion of the requested
operation in the case of the success response). It gives
the switch controller an idea of how many MPLS Labels it
could request. The number given is the maximum possible
given the constraints of the switch hardware. There is
no implication that this number of Labels is available
to every switch port.
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6. State and Statistics Messages
The state and statistics messages permit the controller to request
the values of various hardware counters associated with the switch
input and output ports and connections. They also permit the
controller to request the connection state of a switch input port.
The Connection Activity message is used to determine whether one
or more specific connections have recently been carrying traffic.
The Statistics message is used to query the various port and
connection traffic and error counters.
The Report Connection State message is used to request an input
port to report the connection state for a single connection, a
single ATM virtual path connection, or for the entire input port.
6.1 Connection Activity Message
The Connection Activity message is used to determine whether one
or more specific connections have recently been carrying traffic.
The Connection Activity message contains one or more Activity
Records. Each Activity Record is used to request and return
activity information concerning a single connection. Each
connection is specified by its input port and Input Label which
are specified in the Input Port and Input Label fields of each
Activity Record.
Two forms of activity detection are supported. If the switch
supports per connection traffic accounting, the current value of
the traffic counter for each specified connection must be
returned. The units of traffic counted are not specified but will
typically be either cells or frames. The controller must compare
the traffic counts returned in the message with previous values
for each of the specified connections to determine whether each
connection has been active in the intervening period. If the
switch does not support per connection traffic accounting, but is
capable of detecting per connection activity by some other
unspecified means, the result may be indicated for each connection
using the Flags field. The Connection Activity message is:
Message Type = 48
The Connection Activity request and success response messages have
the following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Records | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Activity Records ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Number of Records
Field specifies the number of Activity Records to
follow. The number of Activity records in a single
Connection Activity message must not cause the packet
length to exceed the maximum transmission unit defined
by the encapsulation.
Each Activity Record has the following format:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V|C|A|E| Input Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Input Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Traffic Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
Input Port
Identifies the port number of the input port on which
the connection of interest arrives in order to identify
the connection (regardless of whether the traffic count
for the connection is maintained on the input port or
the output port).
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Input Label
Fields identify the specific connection for which
statistics are being requested.
Flags
V: Valid Record
In the success response message the Valid Record flag is
used to indicate an invalid Activity Record. The flag
must be zero if any of the fields in this Activity
Record are invalid, if the input port specified by the
Input Port field does not exist, or if the specified
connection does not exist. If the Valid Record flag is
zero in a success response message, the Counter flag,
the Activity flag, and the Traffic Count field are
undefined. If the Valid Record flag is set, the Activity
Record is valid, and the Counter and Activity flags are
valid. The Valid Record flag is not used in the request
message.
C: Counter
In a success response message, if the Valid Record flag
is set, the Counter flag, if zero, indicates that the
value in the Traffic Count field is valid. If set, it
indicates that the value in the Activity flag is valid.
The Counter flag is not used in the request message.
A: Activity
In a success response message, if the Valid Record and
Counter flags are set, the Activity flag, if set,
indicates that there has been some activity on this
connection since the last Connection Activity message
for this connection. If zero, it indicates that there
has been no activity on this connection since the last
Connection Activity message for this connection. The
Activity flag is not used in the request message.
E: Extension Label
The Extension Label Flag is used to extend the adjacent
label field by inserting, after the adjacent label, an
additional 32 bit word into the message. A 32 bit word
formatted according to the line marked ** in the message
diagram follows the adjacent label field if and only if
the E Flag is set.
Traffic Count
Field is not used in the request message. In the success
response message, if the switch supports per connection
traffic counting, the Traffic Count field must be set to
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the value of a free running, connection specific, 64-bit
traffic counter counting traffic flowing across the
specified connection. The value of the traffic counter
is not modified by reading it. If per connection traffic
counting is supported, the switch must report the
Connection Activity result using the traffic count
rather than using the Activity flag.
The format of the failure response is the same as the request
message with the Number of Records field set to zero and no
Connection Activity records returned in the message. If the switch
is incapable of detecting per connection activity, a failure
response must be returned indicating, "The specified request is
not implemented on this switch."
6.2 Statistics Messages
The Statistics messages are used to query the various port and
connection and error counters.
The Statistics request messages have the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x|E| Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
E: Extension Label
The Extension Label Flag is used to extend the adjacent
label field by inserting, after the adjacent label, an
additional 32 bit word into the message. A 32 bit word
formatted according to the line marked ** in the message
diagram follows the adjacent label field if and only if
the E Flag is set.
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Label
The Label Field identifies the specific connection for
which statistics are being requested.
The success response for the Statistics message has the following
format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x|E| Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Input Cell Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Input Frame Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Input Cell Discard Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Input Frame Discard Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ ATM HEC Error Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Input Invalid Label Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Output Cell Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Output Frame Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Output Cell Discard Count +
| |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Output Frame Discard Count +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
E
Port
Label
Fields are the same as those of the request message.
Input Cell Count
Output Cell Count
Give the value of a free running 64-bit counter counting
cells arriving at the input or departing from the output
respectively.
Input Frame Count
Output Frame Count
Give the value of a free running 64-bit counter counting
frames (packets) arriving at the input or departing from
the output respectively.
Input Cell Discard Count
Output Cell Discard Count
Give the value of a free running 64-bit counter counting
cells discarded due to queue overflow on an input port
or on an output port respectively.
Input Frame Discard Count
Output Frame Discard Count
Give the value of a free running 64-bit counter counting
frames discarded due to congestion on an input port or
on an output port respectively.
ATM HEC Error Count
Gives the value of a free running 64-bit counter
counting ATM cells discarded due to header checksum
errors on arrival at an input port.
Invalid Label Count
Gives the value of a free running 64-bit counter
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counting cells or frames discarded because their Label
is invalid on arrival at an input port.
6.2.1 Port Statistics Message
The Port Statistics message requests the statistics for the switch
port specified in the Port field. The contents of the Label field
in the Port Statistics request message is ignored. All of the
count fields in the success response message refer to per-port
counts regardless of the connection to which the cells or frames
belong. Any of the count fields in the success response message
not supported by the port must be set to zero. The Port Statistics
message is:
Message Type = 49
6.2.2 Connection Statistics Message
The Connection Statistics message requests the statistics for the
connection specified in the Label field that arrives on the switch
input port specified in the Port field. All of the count fields in
the success response message refer only to the specified
connection. The ATM HEC Error Count and Invalid Label Count fields
are not connection specific and must be set to zero. Any of the
other count fields not supported on a per connection basis must be
set to zero in the success response message. The Connection
Statistics message is:
Message Type = 50
6.2.3 QoS Class Statistics Message
The QoS Class Statistics message is not supported in this version
of GSMP.
Message Type = 51 is reserved.
6.3 Report Connection State Message
The Report Connection State message is used to request an input
port to report the connection state for a single connection or for
the entire input port. The Report Connection State message is:
Message Type = 52
The Report Connection State request message has the following
format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A|V|x|E| Input Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Input Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
Input Port
Identifies the port number of the input port for which
the connection state is being requested.
Flags
A: All Connections
If the All Connections flag is set, the message requests
the connection state for all connections that arrive at
the input port specified by the Input Port field. In
this case the Input Label field and the Label flag are
unused.
V: ATM VPI
The ATM VPI flag may only be set for ports with
PortType=ATM. If the switch receives a Report Connection
State message in which the ATM VPI flag set and in which
the input port specified by the Input Port field does
not have PortType=ATM, the switch must return an Error
Message "xxxxxx".
If the All Connections flag is zero and the ATM VPI flag
is also zero, the message requests the connection state
for the connection that arrives at the input port
specified by the Port and Input Label fields.
ATM specific procedures:
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If the All Connections flag is zero and the ATM VPI
flag is set and the input port specified by the Input
Port field has LabelType=ATM, the message requests
the connection state for the virtual path connection
that arrives at the input port specified by the Input
Port and Input VPI fields. If the specified Input VPI
identifies an ATM virtual path connection (i.e. a
single switched virtual path) the state for that
connection is requested. If the specified Input VPI
identifies a virtual path containing virtual channel
connections, the message requests the connection
state for all virtual channel connections that belong
to the specified virtual path.
x: Unused.
E: Extension Label
The Extension Label Flag is used to extend the adjacent
label field by inserting, after the adjacent label, an
additional 32 bit word into the message. A 32 bit word
formatted according to the line marked ** in the message
diagram follows the adjacent label field if and only if
the E Flag is set.
Input Label
Field identifies the specific connection for which
connection state is being requested. For requests that
do not require a connection to be specified, the Input
Labelfield is not used.
The Report Connection State success response message has the
following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Connection Records ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Input Port
Is the same as the Input Port field in the request
message. It identifies the port number of the input port
for which the connection state is being reported.
Sequence Number
In the case that the requested connection state cannot
be reported in a single success response message, each
successive success response message in reply to the same
request message must increment the Sequence Number. The
Sequence Number of the first success response message,
in response to a new request message, must be zero.
Connection Records
Each success response message must contain one or more
Connection Records. Each Connection Record specifies a
single point-to-point or point-to-multipoint connection.
The number of Connection Records in a single Report
Connection State success response must not cause the
packet length to exceed the maximum transmission unit
defined by the encapsulation. If the requested
connection state cannot be reported in a single success
response message, multiple success response messages
must be sent. All success response messages that are
sent in response to the same request message must have
the same Input Port and Transaction Identifier fields as
the request message. A single Connection Record must not
be split across multiple success response messages. The
More flag of the last Connection Record in a success
response message indicates whether the response to the
request has been completed or whether one or more
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further success response messages should be expected in
response to the same request message.
Each Connection Record has the following format:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A|V|P|M| Input Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Output Branch Records ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
[Editor's note: help, where do i put the extension label flag?]
Flags
A: All Connections
V: ATM VPI
For the first Connection Record in each success response
message the All Connections and the ATM VPI flags must
be the same as those of the request message. For
successive Connection Records in the same success
response message these flags are not used.
P: ATM VPC
The ATM VPC flag may only be set for ports with
PortType=ATM. The ATM VPC flag, if set and only if set,
indicates that the Connection Record refers to an ATM
virtual path connection.
M: More
If the More flag is set, it indicates that another
Connection Record, in response to the same request
message, will follow either in the same success response
message or in a successive success response message. If
the More flag is zero it indicates that this is the last
Connection record in this success response message and
that no further success response messages will be sent
in response to the current request message. It indicates
that the response to the request message is now
complete.
Input Label
The input label of the connection specified in this
Connection Record.
Output Branch Records
Each Connection Record must contain one or more Output
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Branch Records. Each Output Branch Record specifies a
single output branch belonging to the connection
identified by the Input Label field of the Connection
Record and the Input Port field of the Report Connection
State message. A point-to-point connection will require
only a single Output Branch Record. A point-to-
multipoint connection will require multiple Output
Branch Records. The last Output Branch Record of each
Connection Record is indicated by the Last Branch flag
of the Output Branch Record. If a point-to-multipoint
connection has more output branches than can fit in a
single Connection Record contained within a single
success response message, that connection may be
reported using multiple Connection Records in multiple
success response messages.
Each Output Branch Record has the following format:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|L|x x|E| Output Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Output Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
Output Port
The output port of the switch to which this output
branch is routed.
Flags
L: Last Branch
The Last Branch flag, if set, indicates that this is the
last Output Branch Record of this Connection Record. If
zero, it indicates that one or more further Output
Branch Records are to follow. If this is the last Output
Branch Record in the message and the Last Branch flag is
zero, further output branches belonging to the same
connection will be given in another Connection Record.
This Connection Record will be the first Connection
Record in the next success response message. This
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Connection Record must have the same Input Label value
as the current Connection Record.
E: Extension Label
The Extension Label Flag is used to extend the adjacent
label field by inserting, after the adjacent label, an
additional 32 bit word into the message. A 32 bit word
formatted according to the line marked ** in the message
diagram follows the adjacent label field if and only if
the E Flag is set.
x: Unused.
Output Label
The output label of the output branch specified in this
Output Branch Record.
ATM specific procedures:
If this Output Branch Record is part of a
Connection Record that specifies a virtual path
connection (the ATM VPC flag is set) the Output VCI
field is unused.
A Report Connection State request message may be issued regardless
of the Port Status or the Line Status of the target switch port.
If the Input Port of the request message is valid, and the All
Connections flag is set, but there are no connections established
on that port, a failure response message must be returned with the
code field set to, "Failure specific to the particular message
type." For the Report Connection State message, this failure code
indicates that no connections matching the request message were
found. This failure message should also be returned if the Input
Port of the request message is valid, the All Connections flag is
zero, and no connections are found on that port matching the
specified connection.
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7. Configuration Messages
The configuration messages permit the controller to discover the
capabilities of the switch. Three configuration request messages
have been defined: Switch, Port, and All Ports.
7.1 Switch Configuration Message
The Switch Configuration message requests the global (non port-
specific) configuration for the switch. The Switch Configuration
message is:
Message Type = 64
The Port field is not used in the switch configuration message.
The Switch Configuration message has the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MType | MType | MType | MType |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Firmware Version Number | Window Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Switch Type | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| Switch Name |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Reservations |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
MType
Represents an alternative QoS Configuration type.
In the request message the requested MType is in the
most significant (leftmost) MType octet; the other three
MType octets are unused. The reply message will either
accept the MType request by including the requested
MType in the leftmost MType field of the response
message or it will reject the MType request by
responding with MType=0, the default MType, in the first
MType field. Optionally, in the case of a rejection,
the switch reply can include up to 3 additional MType
values in the rightmost 3 octets of the reply message
respectively, each of which indicates an available
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alternative QoS Configurations. A switch that supports
on the default QoS Configuration always returns MType=0
in all four MType fields. MType negotiation is discussed
in section 7.1.1.
0 ¡ Indicates use of the default GSMP model
1 ¡ Indicates use of IEEE qGSMP model
2 - 200 - Reserved
201 - 255 - Experimental
Firmware Version Number
The version number of the switch control firmware
installed.
Window Size
The maximum number of unacknowledged request messages
that may be transmitted by the controller without the
possibility of loss. This field is used to prevent
request messages being lost in the switch because of
overflow in the receive buffer. The field is a hint to
the controller. If desired, the controller may
experiment with higher and lower window sizes to
determine heuristically the best window size.
[editor's note: some text may be added here with regard
to the tcp/ip encapsulation since if tcp is used then
the switch may adjust the receiver window size.]
Switch Type
A 16-bit field allocated by the manufacturer of the
switch. (For these purposes the manufacturer of the
switch is assumed to be the organisation identified by
the OUI in the Switch Name field.) The Switch Type
identifies the product. When the Switch Type is combined
with the OUI from the Switch Name the product is
uniquely identified. Network Management may use this
identification to obtain product related information
from a database.
Switch Name
A 48-bit quantity that is unique within the operational
context of the device. A 48-bit IEEE 802 MAC address, if
available, may be used as the Switch Name. The most
significant 24 bits of the Switch Name must be an
Organisationally Unique Identifier (OUI) that identifies
the manufacturer of the switch.
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Max Reservations
The maximum number of Reservations that the switch can
support (see Chapter 10). A value of 0 indicates that
the switch does not support Reservations.
7.1.1 Configuration Message Processing
After adjacency between a controller and a switch is first
established the controller that opts to use a QoS Configuration
other then the default would send the Switch Configuration request
including the requested QoS Configuration's MType value in the
request message. This request must be sent before any connection
messages are exchanged. If the switch can support the requested
QoS configuration then the switch includes the requested MType
value in the response message as an indication that it accepts the
request. If the switch cannot support the requested QoS
Configuration, it replaces the MType value in the request message
with that of the default QoS Configuration, i.e. MType=0.
The switch configuration response messages may additionally
include the MType values of up to three alternative QoS
Configurations that the switch supports and that the controller
may choose between.
The exchange continues until the controller sends a requested
MType that the switch accepts or until it sends a connection
request message. If the exchange ends without confirmation of an
alternate switch model, then the default Mtype=0 is be used.
Once a MType has been established for the switch, it cannot be
changed without full restart; that is the re-establishment of
adjacency with the resetting of all connections.
7.2 Port Configuration Message
The Port Configuration message requests the switch for the
configuration information of a single switch port. The Port field
in the request message specifies the port for which the
configuration is requested. The Port Configuration message is:
Message Type = 65.
The Port Configuration success response message has the following
format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PortType |S|x x x x x x x| Data Fields Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ PortType Specific Data ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Service Specs | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
~ Service Specs List ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Port
The switch port to which the configuration information
refers. Configuration information relating to both the
input and the output sides of the switch port is given.
Port numbers are 32 bits wide and allocated by the
switch. The switch may choose to structure the 32 bits
into subfields that have meaning to the physical
structure of the switch hardware (e.g. physical slot and
port). This structure may be indicated in the Physical
Slot Number and Physical Port Number fields.
PortType [Editor's note: words to be written. also, somewhere in
chapter 1 or so we will need text that explains that
certain protocol elements depend on the PortType value.]
PortType = 0d01 = ATM
PortType = 0d02 = FR
PortType = 0d03 = MPLS
S: Service Model
If set, indicates that Service Model data follows the
PortSpecific port configuration data.
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Data Fields Length
The total length in bytes of the combined PortType
Specific Data and Service Model Data fields. The length
of each of these fields may be derived from the other
data so the value of Data Fields Length serves primarily
as a check and to assist parsing of the All Ports
Configuration message success response.
PortType Specific Data
This field contains the configuration data specific to
the particular port type as specified by the PortType
field. The field format and length depends also on the
value of PortType. PortType Specific Data is defined
below.
Number of Service Specs
Field contains the total number of Service Specs
following in the remainder of the Port Configuration
message response or Port Configuration Record.
Service Specs List
Field contains a sequence of 1 or more Service Specs
(defined below). If the Number of Service Specs is an
even number then 16 bits of padding is inserted after
the last Service Spec in order to justify the end of the
Service Specs List at a 32bit word boundary.
Service Spec
The format of the Service Spec field is given below:
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service ID |Capability Set ID|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Each Service Spec identifies a Service supported by the
switch together with the Capability Set ID that
identifies the parameters of that instance of the
Service. The Service Spec List may contain more than one
Service Spec that share the same Service ID. However,
each Service Spec in the Service Specs List must be
unique.
Service ID
Field contains the Service ID of a Service
supported on the port. Service ID values are
defined as part of the Service definition in
Chapter 8.6.
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Capability Set ID
Field identifies a Capability Set ID of the Service
specified by the Service ID that is supported on
the port. Capability Set ID values are defined by
the Switch in the Service Configuration response
message (see Section 7.4). The switch must not
return a {Service ID, Capability Set ID} pair that
is not reported in a Service Configuration response
message.
7.2.1 PortType Specific Data
The length, format and semantics of the PortType Specific Data field
in the Port Configuration message success response and in the Port
Records of the All Port Configuration message success response all
depend on the PortType value of the same message or record
respectively. The specification of the PortType Specific Data field
is given below. For each defined PortType value the Min and Max
Label fields are given in the subsequent subsections.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V|M|L|R| Min Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|x x x| Max Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Data Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transmit Data Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Status | Line Type | Line Status | Priorities |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Physical Slot Number | Physical Port Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Flags
V: VP Switching
The ATM VPC flag may only be set for ports with
PortType=ATM. The VP Switching flag, if set, indicates
that this input port is capable of supporting virtual
path switching. Else, if zero, it indicates that this
input port is only capable of virtual channel switching.
M: Multicast Labels
The Multicast Labels flag, if set, indicates that this
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output port is capable of labelling each output branch
of a point-to-multipoint tree with a different label. If
zero, it indicates that this output port is not able to
label each output branch of a point-to-multipoint tree
with a different label.
L: Logical Multicast
The Logical Multicast flag, if set, indicates that this
output port is capable of supporting more than a single
branch from any point-to-multipoint connection. This
capability is often referred to as logical multicast. If
zero, it indicates that this output port can only
support a single output branch from each point-to-
multipoint connection.
R: Label Range
The Label Range flag, if set, indicates that this switch
port is capable of reallocating its label range and
therefore accepts the Label Range message. Else, if
zero, it indicates that this port does not accept Label
Range messages.
Q: QoS
The QoS flag, if set, indicates that this switch port is
capable of handling the Quality of Service messages
defined in section 9 of this specification. Else, if
zero, it indicates that this port does not accept the
Quality of Service messages.
x: Unused
Min Label The specification of the Min Label field for each
defined PortType value is given in the subsequent
subsections. The default minimum value of dynamically
assigned incoming label that the connection table on the
input port supports and that may be controlled by GSMP.
This value is not changed as a result of the Label Range
message.
Max Label The specification of the Max Label field for each
defined PortType value is given in the subsequent
subsections. The default maximum value of dynamically
assigned incoming label that the connection table on the
input port supports and that may be controlled by GSMP.
This value is not changed as a result of the Label Range
message.
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Receive Data Rate
The maximum rate of data that may arrive at the input
port in;
cells/s for PortType=ATM
bytes/s for PortType=FR
bytes/s for PortType=MPLS.
Transmit Data Rate
The maximum rate of data that may depart from the output
port in;
cells/s for PortType=ATM
bytes/s for PortType=FR
bytes/s for PortType=MPLS
(The transmit data rate of the output port may be
changed by the Set Transmit Data Rate function of the
Port Management message.)
Port Status
Gives the administrative state of the port. The defined
values of the Port Status field are:
Available:
Port Status = 1. The port is available to both send
and receive cells or frames. When a port changes to
the Available state from any other administrative
state, all dynamically assigned connections must be
cleared and a new Port Session Number must be
generated.
Unavailable:
Port Status = 2. The port has intentionally been
taken out of service. No cells or frames will be
transmitted from this port. No cells or frames will
be received by this port.
Internal Loopback:
Port Status = 3. The port has intentionally been
taken out of service and is in internal loopback:
cells or frames arriving at the output port from
the switch fabric are looped through to the input
port to return to the switch fabric. All of the
functions of the input port above the physical
layer, e.g. header translation, are performed upon
the looped back cells or frames.
External Loopback:
Port Status = 4. The port has intentionally been
taken out of service and is in external loopback:
cells or frames arriving at the input port from the
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external communications link are immediately looped
back to the communications link at the physical
layer without entering the input port. None of the
functions of the input port above the physical
layer are performed upon the looped back cells or
frames.
Bothway Loopback:
Port Status = 5. The port has intentionally been
taken out of service and is in both internal and
external loopback.
The Port Status of the port over which the GSMP session
controlling the switch is running, must be declared
Available. The controller will ignore any other Port
status for this port. The Port Status of switch ports
after power-on initialisation is not defined by GSMP.
Line Type [Note: what about other port types? Fiffi]
Only applicable for PortType=ATM. The type of physical
transmission interface for this port. The values for
this field are defined by the atmIfType object specified
in the Ipsilon IP Switch MIB [4].
Line Status
The status of the physical transmission medium connected
to the port. The defined values of the Line Status field
are:
Up: Line Status = 1. The line is able to both send and
receive. When the Line Status changes to Up from
either the Down or Test states, a new Port Session
Number must be generated.
Down: Line Status = 2. The line is unable either to send
or receive or both.
Test: Line Status = 3. The port or line is in a test
mode, for example, power-on test.
Priorities
The number of different priority levels that this output
port can assign to connections. Zero is invalid in this
field. If an output port is able to support "Q"
priorities, the highest priority is numbered zero and
the lowest priority is numbered "Q-1". The ability to
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offer different qualities of service to different
connections based upon their priority is assumed to be a
property of the output port of the switch. It may be
assumed that for connections that share the same output
port, a cell or frame on a connection with a higher
priority is much more likely to exit the switch before a
cell or frame on a connection with a lower priority if
they are both in the switch at the same time.
Physical Slot Number
The physical location of the slot in which the port is
located. It is an unsigned 16-bit integer that can take
any value except 0xFFFF. The value 0xFFFF is used to
indicate "unknown." The Physical Slot Number is not used
by the GSMP protocol. It is provided to assist network
management in functions such as logging, port naming,
and graphical representation.
Physical Port Number
The physical location of the port within the slot in
which the port is located. It is an unsigned 16-bit
integer that can take any value except 0xFFFF. The value
0xFFFF is used to indicate "unknown." The Physical Port
Number is not used by the GSMP protocol. It is provided
to assist network management in functions such as
logging, port naming, and graphical representation.
There must be a one to one mapping between Port Number
and the Physical Slot Number and Physical Port Number
combination. Two different Port Numbers must not yield
the same Physical Slot Number and Physical Port Number
combination. The same Port Number must yield the same
Physical Slot Number and Physical Port Number within a
single GSMP session. If both Physical Slot Number and
Physical Port Number indicate "unknown" the physical
location of switch ports may be discovered by looking up
the product identity in a database to reveal the
physical interpretation of the 32-bit Port Number.
7.2.1.1 PortType Specific data for PortType=ATM
If PortType=ATM the label range fields have following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V|M|L|R| Min VPI | Min VCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|x x x| Max VPI | Max VCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Min VPI The default minimum value of dynamically assigned
incoming VPI that the connection table on the input port
supports and that may be controlled by GSMP.
Max VPI The default maximum value of dynamically assigned
incoming VPI that the connection table on the input port
supports and that may be controlled by GSMP.
At power-on, after a hardware reset, and after the Reset
Input Port function of the Port Management message, the
input port must handle all values of VPI within the
range Min VPI to Max VPI inclusive and GSMP must be able
to control all values within this range. It should be
noted that the range Min VPI to Max VPI refers only to
the incoming VPI range that can be supported by the
associated port. No restriction is placed on the values
of outgoing VPIs that may be written into the cell
header. If the switch does not support virtual paths it
is acceptable for both Min VPI and Max VPI to specify
the same value, most likely zero.
Use of the Label Range message allows the range of VPIs
supported by the port to be changed. However, the Min
VPI and Max VPI fields in the Port Configuration and All
Ports Configuration messages always report the same
default values regardless of the operation of the Label
Range message.
Min VCI The default minimum value of dynamically assigned
incoming VCI that the connection table on the input port
can support and may be controlled by GSMP. This value is
not changed as a result of the Label Range message.
Max VCI The default maximum value of dynamically assigned
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incoming VCI that the connection table on the input port
can support and may be controlled by GSMP.
At power-on, after a hardware reset, and after the Reset
Input Port function of the Port Management message, the
input port must handle all values of VCI within the
range Min VCI to Max VCI inclusive, for each of the
virtual paths in the range Min VPI to Max VPI inclusive,
and GSMP must be able to control all values within this
range. It should be noted that the range Min VCI to Max
VCI refers only to the incoming VCI range that can be
supported by the associated port on each of the virtual
paths in the range Min VPI to Max VPI. No restriction is
placed on the values of outgoing VCIs that may be
written into the cell header.
Use of the Label Range message allows the range of VCIs
to be changed on each VPI supported by the port.
However, the Min VCI and Max VCI fields in the Port
Configuration and All Ports Configuration messages
always report the same default values regardless of the
operation of the Label Range message.
For a port over which the GSMP protocol is operating,
the VCI of the GSMP control channel may or may not be
reported as lying within the range Min VCI to Max VCI. A
switch should honour a connection request message that
specifies the VCI value of the GSMP control channel even
if it lies outside the range Min VCI to Max VCI.
7.2.1.2 PortType Specific data for PortType=FR
If PortType=FR the label range fields have following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V|M|L|R|x x|Len| Min DLCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|x x x x x x x| Max DLCI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Len
This field specifies the number of bits of the DLCI. The
following values are supported:
Len DLCI bits
0 10
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1 17
2 23
Min DLCI
Max DLCI Specify a range of DLCI values, Min DLCI to Max DLCI
inclusive. The values should be right justified in the
23 bit fields and the preceding bits should be set to
zero. A single DLCI may be specified with a Min DLCI and
a Max DLCI having the same value. In a request message,
if the value of the Max DLCI field is less than or equal
to the value of the Min DLCI field, the requested range
is a single DLCI with a value equal to the Min DLCI
field. Zero is a valid value.
7.2.1.3 PortType Specific data for PortType=MPLS
The Label Range field for PortTypes using MPLS labels (e.g.
Ethernet, SONET etc.) has the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V|M|L|R|x x x x x x x x| Min MPLS Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q x x x|x x x x x x x x| Max MPLS Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Min MPLS Label:
Max MPLS Label:
Specify a range of MPLS label values, Min MPLS Label to
Max MPLS Label inclusive. The Max and Min MPLS label
fields are 20 bits each.
7.3 All Ports Configuration Message
The All Ports Configuration message requests the switch for the
configuration information of all of its ports. The All Ports
Configuration message is:
Message Type = 66
The Port field is not used in the request message.
The All Ports Configuration success response message has the
following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Records | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Port Records ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Number of Records
Field gives the total number of Port Records to be
returned in response to the All Ports Configuration
request message. The number of port records in a single
All Ports Configuration success response must not cause
the packet length to exceed the maximum transmission
unit defined by the encapsulation. If a switch has more
ports than can be sent in a single success response
message it must send multiple success response messages.
All success response messages that are sent in response
to the same request message must have the same
Transaction Identifier as the request message and the
same value in the Number of Records field. All success
response messages that are sent in response to the same
request message, except for the last message, must have
the result field set to "More." The last message, or a
single success response message, must have the result
field set to "Success." All Port records within a
success response message must be complete, i.e. a single
Port record must not be split across multiple success
response messages.
Port Records
Follow in the remainder of the message. Each port record
has the following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PortType |S|x x x x x x x| Data Fields Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ PortType Specific Data ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Service Specs | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
~ Service Specs List ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The definition of the fields in the Port Record is exactly the
same as that of the Port Configuration message.
7.4 Service Configuration Message
The Service Configuration message requests the switch for the
configuration information of the Services that are supported. The
Service Configuration message is:
Message Type = 67
The Service Configuration success response message has the
following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Service Records | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Service Records ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Number of Service Records
Field gives the total number of Service Records to be
returned in the Service model Data field.
Service Records
A sequence of zero or more Service Records. The switch
returns one Service Record for each Service that it
supports any of its ports. A Service record contains the
configuration data of the specified Service. Each
Service Record has the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service ID | Reserved | Number of Cap. Set. Records |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Capability Set Records ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Service ID The Service ID Field identifies the Service supported by
the port. The Services are defined with their Service ID
values in Chapter 8.6.
Number of Cap. Set. Records
Field gives the total number of Capability Set Records
to be returned in the Service Record field.
Capability Set Records
The switch returns one or more Capability Set Records in
each Service Record. A Capability Set contains a set of
parameters that describe the QoS parameter values and
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traffic controls that apply to an instance of the
Service. Each Capability Set record has the following
format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cap. Set ID | Reserved | Traffic Controls |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| CLR | CTD |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Frequency | CDV |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Capability Set ID
The value in this Field defines a Capability Set ID
supported by the switch. The values of a Capability Set
ID is assigned by the switch and used in Port
Configuration messages to identify Capability Sets
supported by individual ports. Each Capability Set
Record within a Service Record must have a unique
Capability Set ID.
Traffic Controls
Field identifies the availability of Traffic Controls within
the Capability Set. Traffic Controls are defined as part of the
respective Service definition, see Chapter 8.6. Some or all of
the Traffic Controls may be undefined for a given Service, in
which case the corresponding Flag is ignored by the controller.
The Traffic Controls field is formatted into Traffic Control
Sub-fields as follows:
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| U | D | I | E | S | V | Res |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Traffic Control Sub-fields have the following encoding:
0b00 Indicates that the Traffic Control is not available in
the Capability Set.
0b01 Indicates that the Traffic Control is applied to all
connections that use the Capability Set.
0b10 Indicates that the Traffic Control is available for
application to connections that use the Capability Set
on a per connection basis.
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0b11 Reserved
Traffic Control Sub-fileds:
U: Usage Parameter Control
The Usage Parameter Control sub-field indicates the
availability of Usage Parameter Control for the
specified Service and Capability Set.
D: Packet Discard
The Packet Discard sub-field indicates the availability
of Packet Discard for the specified Service and
Capability Set.
I: Ingress Shaping
The Ingress Shaping sub-field indicates the availability
of Ingress Traffic Shaping to the Peak Cell Rate and
Cell Delay Variation Tolerance for the specified Service
and Capability Set.
E: Egress Shaping, Peak Rate
The Egress Shaping, Peak Rate sub-field indicates the
availability of Egress Shaping to the Peak Cell Rate and
Cell Delay Variation Tolerance for the specified Service
and Capability Set.
S: Egress Traffic Shaping, Sustainable Rate
The Egress Shaping, Sustainable Rate sub-field, if set,
indicates that Egress Traffic Shaping to the Sustainable
Cell Rate and Maximum Burst Size is available for the
specified Service and Capability Set.
V: VC Merge
The VC Merge sub-field indicates the availability of ATM
Virtual Channel Merge (i.e. multipoint to point ATM
switching with a traffic control to avoid AAL5 PDU
interleaving) capability for the specified Service and
Capability Set.
Res: Reserved
QoS Parameters
The remaining four fields in the Capability Set Record contain
the values of QoS Parameters. QoS Parameters are defined as
part of the respective Service definition, see Chapter 8.6.
Some or all of the QoS Parameters may be undefined for a given
Service, in which case the corresponding field is ignored by
the controller.
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CLR: Cell Loss Ratio
The Cell Loss Ratio parameter indicates the CLR
guaranteed by the switch for the specified Service. A
cell loss ratio is expressed as an order of magnitude n,
where the CLR takes the value 10exp(n). The value n is
coded as a binary integer, having a range of 1 <= n <=
15. In addition, the value 0b1111 1111 indicates that no
CLR guarantees is given.
Frequency
The frequency field is coded as an 8 bit unsigned
integer. Frequency applies to the MPLS CR-LDP Service
(see Section 9.4.3). Valid values of Frequency are:
0 - Very frequent
1 - Frequent
2 - Unspecified
CTD: Cell Transfer delay
The CTD value is expressed in units of microseconds. It
is coded as a 24-bit binary integer.
CDV: Peak-to-peak Cell Delay Variation
The CDV value is expressed in units of microseconds. It
is coded as a 24-bit binary integer.
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8. Event Messages
Event messages allow the switch to inform the controller of
certain asynchronous events. By default the controller does not
acknowledge event messages unless ReturnReceipt is set in the
Result field. The Code field is only used in case of Adjacency
Update message, otherwise it is not used and should be set to
zero. Event messages are not sent during initialisation. Event
messages have the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Event Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|x x x|E| Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
Event Sequence Number
The current value of the Event Sequence Number for the
specified port. The Event Sequence Number is set to zero
when the port is initialised. It is incremented by one
each time the port detects an asynchronous event that
the switch would normally report via an Event message.
The Event Sequence Number must be incremented each time
an event occurs even if the switch is prevented from
sending an Event message due to the action of the flow
control.
E: Extension Label
The Extension Label Flag is used to extend the adjacent
label field by inserting, after the adjacent label, an
additional 32 bit word into the message. A 32 bit word
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formatted according to the line marked ** in the message
diagram follows the adjacent label field if and only if
the E Flag is set.
Label
Field gives the Label to which the event message refers.
If this field is not required by the event message it is
set to zero.
Each switch port must maintain an Event Sequence Number and a set
of Event Flags, one Event Flag for each type of Event message.
When a switch port sends an Event message it must set the Event
Flag on that port corresponding to the type of the event. The port
is not permitted to send another Event message of the same type
until the Event Flag has been reset. Event Flags are reset by the
"Reset Event Flags" function of the Port Management message. This
is a simple flow control preventing the switch from flooding the
controller with event messages. The Event Sequence Number of the
port must be incremented every time an event is detected on that
port even if the port is prevented from reporting the event due to
the action of the flow control. This allows the controller to
detect that it has not been informed of some events that have
occurred on the port due to the action of the flow control.
8.1 Port Up Message
The Port Up message informs the controller that the Line Status of
a port has changed from either the Down or Test state to the Up
state. When the Line Status of a switch port changes to the Up
state from either the Down or Test state a new Port Session Number
must be generated, preferably using some form of random number.
The new Port Session Number is given in the Port Session Number
field. The Label field is not used and is set to zero. The Port Up
message is:
Message Type = 80
8.2 Port Down Message
The Port Down message informs the controller that the Line Status
of a port has changed from the Up state to the Down state. This
message will be sent to report link failure if the switch is
capable of detecting link failure. The port session number that
was valid before the port went down is reported in the Port
Session Number field. The Label field is not used and is set to
zero. The Port Down message is:
Message Type = 81
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8.3 Invalid Label Message
The Invalid Label message is sent to inform the controller that
one or more cells or frames have arrived at an input port with a
Label that is currently not allocated to an assigned connection.
The input port is indicated in the Port field, and the Label in
the Label field. The Invalid Label message is:
Message Type = 82
8.4 New Port Message
The New Port message informs the controller that a new port has
been added to the switch. The port number of the new port is given
in the Port field. A new Port Session Number must be assigned,
preferably using some form of random number. The new Port Session
Number is given in the Port Session Number field. The state of the
new port is undefined so the Label field is not used and is set to
zero. The New Port message is:
Message Type = 83
8.5 Dead Port Message
The Dead Port message informs the controller that a port has been
removed from the switch. The port number of the port is given in
the Port field. The Port Session Number that was valid before the
port was removed is reported in the Port Session Number field. The
Label fields are not used and are set to zero. The Dead Port
message is:
Message Type = 84
8.6 Adjacency Update Message
The Adjacency Update message informs the controller when
adjacencies, i.e. other controllers controlling a specific
partition, are joining or leaving. When a new adjacency has been
established, the switch sends an Adjacency Update message to every
controller with an established adjacency to that partition. The
Adjacency Update message is also sent when adjacency is lost
between the partition and a controller, provided that there are
any remaining adjacencies with that partition. The Code field is
used to indicate the number of adjacencies known by the switch
partition. The label field is not used and should be set to zero.
The Adjacency Update message is:
Message Type = 85
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9. Service Model Definition
9.1 Overview
In the GSMP Service Model a controller may request the switch to
establish a connection with a given Service. The requested Service
is identified by including a Service ID in the Add Branch message.
The Service ID refers to a Service Definition provided in this
chapter of the GSMP specification.
A switch that implements one or more of the Services, as defined
below, advertises the availability of these Services in the
Service Configuration message response (see Section 7.4). Details
of the switch's implementation of a given Service that are
important to the controller (e.g. the value of delay or loss
bounds or the availability of traffic controls such as policers or
shapers) are reported in the form of a Capability Set in the
Service Configuration message response.
Thus a switch's implementation of a Service is defined in two
parts: the Service Definition, which is part of the GSMP
specification, and the Capability Set, which describes attributes
of the Service specific to the switch. A switch may support more
than one Capability Set for a given Service. For example if a
switch supports one Service with two different values of a delay
bound it could do this by reporting two Capability Sets for that
Service.
The Service Definition is identified in GSMP messages by the
Service ID, an eight bit identifier. Assigned numbers for the
Service ID are given with the Service Definitions in Section 9.4.
The Capability Set is identified in GSMP messages by the
Capability Set ID, an eight bit identifier. Numbers for the
Capability Set ID are assigned by the switch and are advertised in
the Service Configuration message response.
The switch reports all its supported Services and Capability Sets
in the Service Configuration message response. The subset of
Services and Capability Sets supported on an individual port is
reported in the Port Configuration message response or in the All
Ports Configuration message response. In these messages the
Services and Capability Sets supported on the specified port are
indicated by a list of {Service ID, Capability Set ID} number
pairs.
9.2 Service Model Definitions
Terms and objects defined for the GSMP Service Model are given in
this section.
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9.2.1 Original Specifications
Services in GSMP are defined largely with reference to Original
Specifications, i.e. the standards or implementation agreements
published by organisations such as ITU-T, IETF, and ATM Forum that
originally defined the Service. This version of GSMP refers to 4
Original specifications: [8], [9], [10], and [11].
9.2.2 Service Definition, Traffic Parameters, QoS Parameters and
Traffic Controls
Each Service Definition in GSMP includes definition of:
Traffic Parameters
Traffic Parameter definitions are associated with Services
while Traffic Parameter values are associated with
connections.
Traffic Parameters quantitatively describe a connection's
requirements on the Service. For example, Peak Cell Rate is
a Traffic Parameter of the Service defined by the ATM Forum
Constant Bit Rate Service Category.
Some Traffic Parameters are mandatory and some are
optional, depending on the Service.
Semantics of Traffic Parameters are defined by reference to
Original Specifications.
QoS Parameters
QoS Parameters and their values are associated with
Services.
QoS Parameters express quantitative characteristics of a
switch's support of a Service. They include, for example,
quantitative bounds on switch induced loss and delay.
Some QoS Parameters will be mandatory and some will be
optional.
Semantics of QoS Parameters are defined by reference to
Original Specifications.
Traffic Controls
The implementation of some Services may include the use of
Traffic Controls. Traffic Controls include for example
functions such as policing, input shaping, output shaping,
tagging and marking, frame vs. cell merge, frame vs. cell
discard.
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Switches are not required to support Traffic Controls. Any
function that is always required in the implementation of a
Service is considered part of the Service and is not
considered a Traffic Control.
If a switch supports a Traffic Control then the control may
be applied either to all connections that use a given
Capability Set (see below) or to individual connections.
The definition of a Traffic Control is associated with a
Service. Traffic Controls are defined, as far as possible,
by reference to Original Specifications.
9.2.3 Capability Sets
For each Service that a switch supports the switch must also
support at least one Capability Set. A Capability Set establishes
characteristics of a switch's implementation of a Service. It may
be appropriate for a switch to support more than one Capability
Set for a given Service.
A Capability Set may contain, depending on the Service definition,
QoS Parameter values and indication of availability of Traffic
Controls.
If a switch reports QoS Parameter values in a Capability Set then
these apply to all the connections that use that Capability Set.
For each Traffic Control defined for a given Service the switch
reports availability of that control as one of the following:
Not available in the Capability Set,
Applied to all connections that use the Capability Set, or
Available for application to connections that use the
Capability Set on a per connection basis. In this case a
controller may request application of the Traffic Control
in connection management messages.
9.3 Service Model Procedures
A switch's Services and Capability Sets are reported to a
controller in a Service Configuration messages. A Service
Configuration message response includes the list of Services
defined for GSMP that the switch supports and, for each Service, a
specification of the Capability Sets supported for the Service.
Services are referred to by numbers standardised in the GSMP
specification. Capability Sets are referred to by a numbering
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system reported by the switch. Each Capability Set within a given
Service includes a unique identifying number together with the
switch's specification of QoS Parameters and Traffic Controls.
A switch need not support all the defined Services and Capability
Sets on every port. The supported Services and Capability Sets are
reported to the controller on a per port basis in port
configuration messages. Port configuration response messages list
the supported Services using the standardised identifying numbers
and the Capability Sets by using the identifying numbers
established in the switch Service configuration messages.
GSMP does not provide a negotiation mechanism by which a
controller may establish or modify Capability Sets.
When a controller establishes a connection, the connection
management message includes indication of the Service and the
Capability Set. Depending on these the connection management
message may additionally include Traffic Parameter values and
Traffic Control flags.
A connection with a given Service can only be established if both
the requested Service and the requested Capability Set are
available on all of the connection's input and output ports.
Refresh of an extant connection is permitted but the add branch
message requesting the message must not include indication of
Service, Capability Sets or Traffic Parameters.
An extant connection's Traffic Parameters may be changed without
first deleting the connection. The Service and Capability Sets of
an extant connection cannot be changed. Either the one stage or
two stage connection set-up procedure may be used to change an
extant connection's Traffic Parameters.
Move branch messages may be refused on the grounds of resource
depletion. In the case of a one stage set-up the connection state
does not change if a move branch request is thus refused.
A switch may support a bandwidth allocation function. If it does,
a controller may choose to use it or not to use it. A controller
indicates whether or not switch bandwidth allocation is requested
using a bandwidth allocation (BA) flag in connection management
messages. A switch indicates that it is honouring the bandwidth
allocation request, and thus the QoS commitments indicated in the
QoS of its Capability Sets, by responding with the BA flag set. If
the switch does not have a bandwidth allocation function then it
will always respond with the BA flag zeroed. If the controller
ever sends a request with a zeroed BA flag, the switch is not
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obliged to honour the QoS commitments for the requested
connection, other extant connections or future connections. If the
switch receives a request with the BA flag set it must not reject
the connection based on a lack of bandwidth. If, after the
controller has issued a request with the BA flag zeroed, the
switch is still able to track whether or not it is honouring the
QoS commitments then it may indicate that QoS commitments are
honoured using the BA flag in its responses. The controller may
poll the switch with connection refresh messages to determine if
the switch is still honouring QoS.
9.4 Service Definitions
This section sets forth the definition of Services. Each Service
will be defined in its own subsection. Each Service definition
includes the following definitions:
Service Identifier
The reference number used to identify the Service in GSMP
messages.
Service Characteristics
A definition of the Service.
Traffic Parameters
A definition of the Traffic Parameters used in connection
management messages.
QoS Parameters
A definition of the QoS Parameters that are included in the
Capability Set for instances of the Service.
Traffic Controls
A definition of the Traffic Controls that may be supported
by an instance of the Service.
Descriptive text is avoided wherever possible in order to minimise
any possibility of semantic conflict with the Original
Specifications.
9.4.1 ATM Forum Service Categories
9.4.1.1 CBR
Service Identifier:
CBR.1 - Service ID = 1
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Service Characteristics:
Equivalent to ATM Forum CBR.1 Service, see [8].
Traffic Parameters:
- Peak Cell Rate
- Cell Delay Variation Tolerance
QoS Parameters:
- Cell Loss Ratio
- Maximum Cell Transfer Delay
- Peak-to-peak Cell Delay Variation
Traffic Controls:
- (U) Usage Parameter Control
- (I) Ingress Traffic Shaping to the Peak Cell Rate
- (E) Egress Traffic Shaping to the Peak Cell Rate and Cell
Delay Variation Tolerance
- (D) Packet Discard
9.4.1.2 rt-VBR
Service Identifier:
rt-VBR.1 - Service ID = 2
rt-VBR.2 - Service ID = 3
rt-VBR.3 - Service ID = 4
Service Characteristics:
Equivalent to ATM Forum rt-VBR Service, see [8].
Traffic Parameters:
- Peak Cell Rate
- Cell Delay Variation Tolerance
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- Sustainable Cell Rate
- Maximum Burst Size
QoS Parameters:
- Cell Loss Ratio
- Maximum Cell Transfer Delay
- Peak-to-peak Cell Delay Variation
Traffic Controls:
- (U) Usage Parameter Control
- (I) Ingress Traffic Shaping to the Peak Cell Rate
- (E) Egress Traffic Shaping to the Peak Cell Rate and Cell
Delay Variation Tolerance
- (S) Egress Traffic Shaping to the Sustainable Cell Rate and
Maximum Burst Size
- (P) Packet Discard
- (V) VC Merge
9.4.1.3 nrt-VBR
Service Identifier:
nrt-VBR.1 - Service ID = 5
nrt-VBR.2 - Service ID = 6
nrt-VBR.3 - Service ID = 7
Service Characteristics:
Equivalent to ATM Forum nrt-VBR Service, see [8].
Traffic Parameters:
- Peak Cell Rate
- Cell Delay Variation Tolerance
- Sustainable Cell Rate
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- Maximum Burst Size
QoS Parameter:
- Cell Loss Ratio
Traffic Controls:
- (U) Usage Parameter Control
- (I) Ingress Traffic Shaping to the Peak Cell Rate
- (E) Egress Traffic Shaping to the Peak Cell Rate and Cell
Delay Variation Tolerance
- (S) Egress Traffic Shaping to the Sustainable Cell Rate and
Maximum Burst Size
- (P) Packet Discard
- (V) VC Merge
9.4.1.4 UBR
Service Identifier:
UBR.1 - Service ID = 8
UBR.2 - Service ID = 9
Service Characteristics:
Equivalent to ATM Forum UBR Service, see [8].
Traffic Parameters:
- Peak Cell Rate
- Cell Delay Variation Tolerance
QoS Parameter:
None
Traffic Controls:
- (U) Usage Parameter Control
- (I) Ingress Traffic Shaping to the Peak Cell Rate
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- (E) Egress Traffic Shaping to the Peak Cell Rate and Cell
Delay Variation Tolerance
- (P) Packet Discard
- (V) VC Merge
9.4.1.5 ABR
ABR is not supported in this version of GSMP.
9.4.1.6 GFR
Service Identifier:
GFR.1 - Service ID = 12
GFR.2 - Service ID = 13
Service Characteristics:
Equivalent to ATM Forum GFR Service, see [8].
Traffic Parameters:
- Peak Cell Rate
- Cell Delay Variation Tolerance
- Minimum Cell Rate
- Maximum Burst Size
- Maximum Frame Size
QoS Parameter:
- Cell Loss Ratio
Traffic Controls:
- (U) Usage Parameter Control
- (I) Ingress Traffic Shaping to the Peak Cell Rate
- (E) Egress Traffic Shaping to the Peak Cell Rate and Cell
Delay Variation Tolerance
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- (V) VC Merge
9.4.2 Integrated Services
9.4.2.1 Controlled Load
Service Identifier:
Int-Serv Controlled Load - Service ID = 20
Service Characteristics:
See [9].
Traffic Parameters:
- Token bucket rate (r)
- Token bucket depth (b)
- Peak rate (p)
- Minimum policed unit (m)
- Maximum packet size (M)
QoS Parameter:
None.
Traffic Controls:
None.
9.4.3 MPLS CR-LDP
Service Identifier:
MPLS CR-LDP QoS - Service ID = 25
Service Characteristics:
See [10].
Traffic Parameters:
- Peak Data Rate
- Peak Burst Size
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- Committed Data Rate
- Committed Burst Size
- Excess Burst Size
- Weight
QoS Parameter:
- Frequency
Traffic Controls:
None currently defined.
9.4.4 Frame Relay
Service Identifier:
Frame Relay Service - Service ID = 30
Service Characteristics:
Equivalent to Frame Relay Bearer Service, see [11].
Traffic Parameters:
- Committed Information Rate
- Committed Burst Rate
- Excess Burst Rate
QoS Parameters:
None
Traffic Controls:
- Usage Parameter Control
- Egress Traffic Shaping to the Committed Information Rate
and Committed Burst Size
9.4.5 Diff-Serv
For future study.
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9.5 Format and encoding of the Traffic Parameters Block in
connection management messages
Connection management messages that use the GSMP Service Model
(i.e. those that have QMS=0b10) include the Traffic Parameters
Block that specifies the Traffic Parameter values of a connection.
The required Traffic Parameters of a given Service are given in
Section 9.4. The format and encoding of these parameters are given
below.
9.5.1 Traffic Parameters for ATM Forum Services
The Traffic Parameters:
- Peak Cell Rate
- Cell Delay Variation Tolerance
- Sustainable Cell Rate
- Maximum Burst Size
- Minimum Cell Rate
- Maximum Frame Size
are defined in [8]. These Parameters are encoded as 24 bit
unsigned integers. Peak Cell Rate, Sustainable Cell Rate, and
Minimum Cell Rate are in units of cells per second. Cell Delay
Variation Tolerance is in units of microseconds. Maximum Burst
Size and Maximum Frame Size are in units of cells. In GSMP
messages the individual Traffic Parameters are encoded as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | 24 bit unsigned integer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The format of the Traffic Parameters Block in connection
management messages depends on the Service. It is a sequence of
the 32 bit words (as shown above) corresponding to the Traffic
Parameters as specified in the Service Definitions given in
Section 9.4.1 in the order given there.
9.5.2 Traffic Parameters for the Int-Serv Controlled Load Service
The Traffic Parameters:
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- Token bucket rate (r)
- Token bucket size (b)
- Peak rate (p)
are defined in [9]. They are encoded as 32 bit IEEE single-
precision floating point numbers. The Traffic Parameters Token
bucket rate (r) and Peak rate (p) are in units of bytes per
seconds. The Traffic Parameter Token bucket size (b) is in units
of bytes.
The Traffic Parameters:
- Minimum policed unit (m)
- Maximum packet size (M)
are defined in [9]. They are encoded as 32 integer in units of
bytes.
The Traffic Parameters Block for the Int-Serv Controlled Load
Service is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Token bucket rate (r) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Token bucket size (b) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Peak rate (p) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Minimum policed unit (m) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Maximum packet size (M) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
9.5.3 Traffic Parameters for the CRLDP Service
The Traffic Parameters:
- Peak Data Rate,
- Peak Burst Size,
- Committed Data Rate,
- Committed Burst Size, and
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- Excess Burst Size
are defined in [10] to be encoded as a 32 bit IEEE single-
precision floating point number. A value of positive infinity is
represented as an IEEE single-precision floating-point number
with an exponent of all ones (255) and a sign and mantissa of all
zeros. The values Peak Data Rate and Committed Data Rate are in
units of bytes per second. The values Peak Burst Size, Committed
Burst Size and Excess Burst Size are in units of bytes.
The Traffic Parameter
- Weight
is defined in [10] to be an 8 bit unsigned integer indicating the
weight of the CRLSP. Valid weight values are from 1 to 255. The
value 0 means that weight is not applicable for the CRLSP.
The Traffic Parameters Block for the CRLDP Service is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Peak Data Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Peak Burst Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Committed Data Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Committed Burst Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Excess Burst Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Weight |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
9.5.4 Traffic Parameters for the Frame Relay Service
The Traffic Parameters:
Committed Information Rate
Committed Burst Size
Excess Burst Size
are defined in [11]. Format and encoding of these parameters for
frame relay signalling messages are defined in [12]. (Note than in
[12] the Committed Information Rate is called "Throughput".) GSMP
uses the encoding defined in [12] but uses a different format.
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The format of the Traffic Parameters Block for Frame Relay Service
is a follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Mag | Reserved| CIR Multiplier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Mag |Res| CBS Multiplier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Mag |Res| EBS Multiplier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Mag This field is an unsigned integer in the range from 0 to
6. The value 7 is not allowed. Mag is the decimal
exponent for the adjacent multiplier field (which itself
functions as a mantissa).
CIR Multiplier
This field is an unsigned integer. It functions as the
mantissa of the Committed Information Rate Traffic
Parameter.
CBS Multiplier
EBS Multiplier
These fields are unsigned integers. They function as the
mantissas of the Committed Burst Size and Excess Burst
Size Traffic Parameters respectively.
The Traffic Parameter Values are related to their encoding in GSMP
messages as follows:
Committed Information Rate = 10^(Mag) * (CIR Multiplier)
Committed Burst Size = 10^(Mag) * (CBS Multiplier)
Excess Burst Size = 10^(Mag) * (EBS Multiplier)
9.6 Traffic Controls (TC) Flags
The TC Flags field in Add Branch messages for connections using
the Service Model are set by the controller to indicate that
specific traffic controls are requested for the requested
connection. The TC Flags field is shown below:
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0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|U|D|I|E|S|V|P|x|
+-+-+-+-+-+-+-+-+
U: Usage Parameter Control
When set, this flag indicates that Usage Parameter
Control is requested.
D: Packet Discard
When set, this flag indicates that Packet Discard is
requested.
I: Ingress Shaping
When set, this flag indicates the availability of
Ingress Traffic Shaping to the Peak Rate and Delay
Variation Tolerance is requested.
E: Egress Shaping, Peak Rate
When set, this flag indicates that Egress Shaping to the
Peak Rate and Delay Variation Tolerance is requested.
S: Egress Traffic Shaping, Sustainable Rate
When set, this flag indicates that Egress Traffic
Shaping to the Sustainable Rate and Maximum Burst Size
is requested.
V: VC Merge
When set, this flag indicates that ATM Virtual Channel
Merge (i.e. multipoint to point ATM switching with a
traffic control to avoid AAL5 PDU interleaving) is
requested.
P: Port
When set indicates that traffic block pertains to
Ingress Port.
x: Reserved
The controller may set (to one) the flag corresponding to the
requested Traffic Control if the corresponding Traffic Control has
been indicated in the Service Configuration response message
(Section 7.4) as available for application to connections that use
the requested Capability Set on a per connection basis. (The
requested Capability Set is indicated by the Capability Set ID the
least significant byte of the Service Selector field of the Add
Branch message.) If the Traffic Control has been indicated in the
Service Configuration response message as either not available in
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the Capability Set or applied to all connections that use the
Capability Set then the controller sets the flag to zero and the
switch ignores the flag.
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10. Reservation Management Messages
GSMP allows switch resources (e.g. bandwidth, buffers, queues,
labels, etc.) to be reserved for connections before the
connections themselves are established. This is achieved through
the manipulation of Reservations in the switch.
Reservations are hard state objects in the switch that can be
created by the controller by sending a Reservation Request
message. Each Reservation is uniquely identified by an identifying
number called a Reservation ID. Reservation objects can be deleted
with the Delete Reservation message or the Delete All Reservations
message. A reservation object is also deleted when the Reservation
is Deployed by specifying a Reservation ID in an Add Branch
message.
The reserved resources must remain reserved until either the
Reservation is deployed, in which case the resources are applied
to a branch, or the Reservation is explicitly deleted (with a
Delete Reservation message or a Delete All Reservations message),
in which case the resources are freed. Reservations and reserved
resources are deleted if the switch is reset.
A Reservation object includes its Reservation ID plus all the
switch state associated with a branch with the exception that the
branch's input label and/or output label may be unspecified. The
Request Reservation message is therefore almost identical to the
Add Branch message.
The switch established the maximum number of reservations it can
store by setting the value of Max Reservations in the Switch
Configuration response message. The switch indicates that it does
not support reservations by setting Max Reservations to 0. The
valid range of Reservation IDs is 1 to Max Reservations).
10.1 Reservation Request Message
The Reservation Request message creates a Reservation in the
switch and reserves switch resources for a connection that may
later be established using an Add Branch message.The Reservation
Request Message is:
Message Type = 70
The Port Management message has the following format for the
request message:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reservation ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|B|U|E| Input Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Input Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Selector |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|QMS|U|E| Output Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** ~x x x|E| Extended Output Label ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Selector |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
When the value of QMS is set to 0b10 then the following Traffic
Parameters Block is appended to the above message:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TC Flags | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Traffic Parameters Block ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
** Note: There can be zero or more 32 bit words containing
Extended Labels (like those marked **) following an Input
or Output Label field. A 32 bit word containing an Extended
Label follows the previous label field if and only if the E
Flag immediately preceding the previous label is set.
All the fields of the Reservation Request message have the same
meanings as they do in the Add Branch message with the following
exceptions:
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Reservation ID
Specifies the Reservation ID of the Reservation. If the
numerical value of Reservation ID is greater than the value
of Max Reservations (from the Switch Configuration
message), a failure response is returned indicating
"Reservation ID out of Range." If the value of Reservation
ID matches that of an extant Reservation, a failure
response is returned indicating "Reservation ID in use."
Flags
U: Unspecified Label
If Unspecified Label flag is set then the adjacent
Label field is unused and the adjacent Extension
Label flag must be set to zero. If Unspecified
Label flag is zero then the adjacent Label field
and Extension Label flag have the same meaning as
in the Add Branch message.
When the switch receives a valid Reservation Request it reserves
all the appropriate switch resources needed to establish a branch
with corresponding attributes. If sufficient resources are not
available, a failure response is returned indicating "Insufficient
Resources." Other failure responses are as defined for the Add
Branch message.
10.2 Delete Reservation Message
The Delete Reservation message deletes a Reservation object in the
switch and frees the reserved switch resources of the reservation.
The Reservation Request Message is:
Message Type = 71
The Delete Reservation message has the following format:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Session Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reservation ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
If the Reservation ID matches that of an extant Reservation then
the reservation is deletes and corresponding switch resources are
freed. If the numerical value of Reservation ID is greater than
the value of Max Reservations (from the Switch Configuration
message), a failure response is returned indicating "Reservation
ID out of Range." If the value of Reservation ID does not match
that of any extant Reservation, a failure response is returned
indicating "Non-existent Reservation ID."
10.3 Delete All Reservations Message
The Delete Reservation message deletes all extant Reservation
objects in the switch and frees the reserved switch resources of
these reservations. The Reservation Request Message is:
Message Type = 72
The Delete Reservation message has the following format:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Result | Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partition ID | Transaction Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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11. Adjacency Protocol
The adjacency protocol is used to synchronise state across the
link, to agree on which version of the protocol to use, to
discover the identity of the entity at the other end of a link,
and to detect when it changes. GSMP is a hard state protocol. It
is therefore important to detect loss of contact between switch
and controller, and to detect any change of identity of switch or
controller. No GSMP messages other than those of the adjacency
protocol may be sent across the link until the adjacency protocol
has achieved synchronisation.
11.1 Packet Format
All GSMP messages belonging to the adjacency protocol have the
following structure:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Message Type | Timer |M| Code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Name |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| Receiver Name |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receiver Port |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Ptype | PFlag | Sender Instance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Partiton Id | Receiver Instance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Version In the adjacency protocol the Version field is used for
version negotiation. In a SYN message the Version field
always contains the highest version understood by the
sender. A receiver receiving a SYN message with a
version higher than understood will ignore that message.
A receiver receiving a SYN message with a version lower
than its own highest version, but a version that it
understands, will reply with a SYNACK with the version
from the received SYN in its GSMP Version field. This
defines the version of the GSMP protocol to be used
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while the adjacency protocol remains synchronised. All
other messages will use the agreed version in the
Version field.
The version number for the version of the GSMP protocol
defined by this specification is Version = 2.
Message Type
The adjacency protocol is:
Message Type = 10
Timer
The Timer field is used to inform the receiver of the
timer value used in the adjacency protocol of the
sender. The timer specifies the nominal time between
periodic adjacency protocol messages. It is a constant
for the duration of a GSMP session. The timer field is
specified in units of 100ms.
M-Flag The M-Flag is used in the SYN message to indicate
whether the sender is a master or a slave. If the M-Flag
is set in the SYN message, the sender is a master. If
zero, the sender is a slave. The GSMP protocol is
asymmetric, the controller being the master and the
switch being the slave. The M-Flag prevents a master
from synchronising with another master, or a slave with
another slave. If a slave receives a SYN message with a
zero M-Flag, it must ignore that SYN message. If a
master receives a SYN message with the M-Flag set, it
must ignore that SYN message. In all other messages the
M-Flag is not used.
Code
Field specifies the function of the message. Four Codes
are defined for the adjacency protocol:
SYN: Code = 1
SYNACK: Code = 2
ACK: Code = 3
RSTACK: Code = 4.
Sender Name
For the SYN, SYNACK, and ACK messages, is the name of
the entity sending the message. The Sender Name is a 48-
bit quantity that is unique within the operational
context of the device. A 48-bit IEEE 802 MAC address, if
available, may be used for the Sender Name. If the
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Ethernet encapsulation is used the Sender Name must be
the Source Address from the MAC header. For the RSTACK
message, the Sender Name field is set to the value of
the Receiver Name field from the incoming message that
caused the RSTACK message to be generated.
Receiver Name
For the SYN, SYNACK, and ACK messages, is the name of
the entity that the sender of the message believes is at
the far end of the link. If the sender of the message
does not know the name of the entity at the far end of
the link, this field should be set to zero. For the
RSTACK message, he Receiver Name field is set to the
value of the Sender Name field from the incoming message
that caused the RSTACK message to be generated.
Sender Port
For the SYN, SYNACK, and ACK messages, is the local port
number of the link across which the message is being
sent. For the RSTACK message, the Sender Port field is
set to the value of the Receiver Port field from the
incoming message that caused the RSTACK message to be
generated.
Receiver Port
For the SYN, SYNACK, and ACK messages, is what the
sender believes is the local port number for the link,
allocated by the entity at the far end of the link. If
the sender of the message does not know the port number
at the far end of the link, this field should be set to
zero. For the RSTACK message, the Receiver Port field is
set to the value of the Sender Port field from the
incoming message that caused the RSTACK message to be
generated.
PTYPE
Type of partition being requested.
0 No Partition Request
1 Fixed Partition
PFLAG
Used to indicate type of partition request.
1 - New Adjacency. In the case of a new adjacency, the
state of the switch will be reset.
2 - Recovered Adjacency. In the case of a recovered
adjacency, the state of the switch will remain, and the
Switch Controller will be responsible for confirming
that the state of the switch matches the desired state.
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Sender Instance
For the SYN, SYNACK, and ACK messages, is the sender's
instance number for the link. It is used to detect when
the link comes back up after going down or when the
identity of the entity at the other end of the link
changes. The instance number is a 32-bit number that is
guaranteed to be unique within the recent past and to
change when the link or node comes back up after going
down. Zero is not a valid instance number. For the
RSTACK message, the Sender Instance field is set to the
value of the Receiver Instance field from the incoming
message that caused the RSTACK message to be generated.
Partition ID
Field used to associate the message with a specific
switch partition.
Receiver Instance
For the SYN, SYNACK, and ACK messages, is what the
sender believes is the current instance number for the
link, allocated by the entity at the far end of the
link. If the sender of the message does not know the
current instance number at the far end of the link, this
field should be set to zero. For the RSTACK message, the
Receiver Instance field is set to the value of the
Sender Instance field from the incoming message that
caused the RSTACK message to be generated.
11.2 Procedure
The adjacency protocol is described by the following rules and
state tables.
The rules and state tables use the following operations:
o The "Update Peer Verifier" operation is defined as storing the
values of the Sender Instance, Sender Port, and Sender Name
fields from a SYN or SYNACK message received from the entity at
the far end of the link.
o The procedure "Reset the link" is defined as:
1. Generate a new instance number for the link
2. Delete the peer verifier (set to zero the values of
Sender Instance, Sender Port, and Sender Name previously
stored by the Update Peer Verifier operation)
3. Send a SYN message
4. Enter the SYNSENT state.
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o The state tables use the following Boolean terms and operators:
A The Sender Instance in the incoming message matches the
value stored from a previous message by the "Update Peer
Verifier" operation.
B The Sender Instance, Sender Port, Sender Name and Sender
Partition ID fields in the incoming message match the
values stored from a previous message by the "Update
Peer Verifier" operation.
C The Receiver Instance, Receiver Port, Receiver Name and
Receiver Partition ID fields in the incoming message
match the values of the Sender Instance, Sender Port,
Sender Name and Sender Partition ID currently sent in
outgoing SYN, SYNACK, and ACK messages.
"&&" Represents the logical AND operation
"||" Represents the logical OR operation
"!" Represents the logical negation (NOT) operation.
o A timer is required for the periodic generation of SYN, SYNACK,
and ACK messages. The value of the timer is announced in the
Timer field. The period of the timer is unspecified but a value
of one second is suggested.
There are two independent events: the timer expires, and a
packet arrives. The processing rules for these events are:
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Timer Expires: Reset Timer
If state = SYNSENT Send SYN
If state = SYNRCVD Send SYNACK
If state = ESTAB Send ACK
Packet Arrives:
If incoming message is an RSTACK:
If (A && C && !SYNSENT) Reset the link
Else Discard the message.
If incoming message is a SYN, SYNACK, or ACK:
Response defined by the following State Tables.
If incoming message is any other GSMP message and
state != ESTAB:
Discard incoming message.
If state = SYNSENT Send SYN (Note 1)
If state = SYNRCVD Send SYNACK (Note 1)
Note 1: No more than two SYN or SYNACK messages should
be sent within any time period of length defined by
the timer.
o State synchronisation across a link is considered to be
achieved when the protocol reaches the ESTAB state. All GSMP
messages, other than adjacency protocol messages, that are
received before synchronisation is achieved will be discarded.
State Tables
State: SYNSENT
+======================================================================+
| Condition | Action | New State |
+====================+=====================================+===========+
| SYNACK && C | Update Peer Verifier; Send ACK | ESTAB |
+--------------------+-------------------------------------+-----------+
| SYNACK && !C | Send RSTACK | SYNSENT |
+--------------------+-------------------------------------+-----------+
| SYN | Update Peer Verifier; Send SYNACK | SYNRCVD |
+--------------------+-------------------------------------+-----------+
| ACK | Send RSTACK | SYNSENT |
+======================================================================+
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State: SYNRCVD
+======================================================================+
| Condition | Action | New State |
+====================+=====================================+===========+
| SYNACK && C | Update Peer Verifier; Send ACK | ESTAB |
+--------------------+-------------------------------------+-----------+
| SYNACK && !C | Send RSTACK | SYNRCVD |
+--------------------+-------------------------------------+-----------+
| SYN | Update Peer Verifier; Send SYNACK | SYNRCVD |
+--------------------+-------------------------------------+-----------+
| ACK && B && C | Send ACK | ESTAB |
+--------------------+-------------------------------------+-----------+
| ACK && !(B && C) | Send RSTACK | SYNRCVD |
+======================================================================+
State: ESTAB
+======================================================================+
| Condition | Action | New State |
+====================+=====================================+===========+
| SYN || SYNACK | Send ACK (note 2) | ESTAB |
+--------------------+-------------------------------------+-----------+
| ACK && B && C | Send ACK (note 3) | ESTAB |
+--------------------+-------------------------------------+-----------+
| ACK && !(B && C) | Send RSTACK | ESTAB |
+======================================================================+
Note 2: No more than two ACKs should be sent within any time
period of length defined by the timer. Thus, one ACK must be sent
every time the timer expires. In addition, one further ACK may be
sent between timer expirations if the incoming message is a SYN or
SYNACK. This additional ACK allows the adjacency protocol to reach
synchronisation more quickly.
Note 3: No more than one ACK should be sent within any time period
of length defined by the timer.
11.3 Partition Information State
Each instance of a [switch controller ¡ switch partition] pair
will need to establish adjacency synchronisation independently.
Part of the process of establishing synchronisation when using
partition will be to establish the assignment of partition
identifiers. Two scenarios are provided for:
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- A controller can request a specific partition identifier
with the switch having the option to either accept or to
reject the request. In this case the adjacency message
will include Partition ID != 0.
- The switch can assign partition identifiers to controllers
based on its on pre-established mechanisms. In this case
the adjacency message will include Partition ID = 0.
The assignment is determined by the following behaviour:
- An adjacency message from the controller with SYN || SYNACK
&& PTYPE is treated as a partition request
- An adjacency message from the switch with SYNACK || ACK &&
PTYPE is treated as a partition assignment
- An adjacency message from the switch with RSTACK && PTYPE
is treated as partition unavailability.
11.4 Loss of Synchronisation
If after synchronisation is achieved, no valid GSMP messages are
received in any period of time in excess of three times the value
of the Timer field announced in the incoming adjacency protocol
messages, loss of synchronisation may be declared.
While re-establishing synchronisation with a controller, a switch
should maintain its state, deferring the decision about resetting
the state until after synchronisation is re-established.
Once synchronisation is re-established the decision about
resetting the state should be made on the following basis:
- If PFLAG = 1, then a new adjacency has been established and
the state should be reset
- If PFLAG = 2, then adjacency has been re-established and
the switch state should be retained. Verification that
controller and switch state are the same is the
responsibility of the controller.
11.5 Multiple Controllers per switch partition
Multiple switch controllers may jointly control a single switch
partition. The controllers may control a switch partition either
in a master/standby fashion or as part of multiple controllers
providing load-sharing for the same partition. It is the
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responsibility of the controller to co-ordinate their interactions
with the switch partition. In order to assist the controllers in
tracking multiple controller adjacencies to a single switch
partition, the Adjacency Update message is used to inform a
controller that there are other controllers interacting the same
partition. It should be noted that the GSMP will not co-ordinate
cache synchronization information among controllers; i.e. the
switch partition will service each command it receives in turn as
if it were interacting with a single controller. Implementations
without controller entity synchronisation are advised against
using multiple controllers with a single switch partition.
11.5.1 Multiple Controller Adjacency Process
The first adjacency for a specific partition is determined by the
procedures described in chapter Partition Information State. The
next adjacencies to the partition are identified by a new
partition request with same Partition id as the first one but with
different Sender Name. Adjacency loss is defined in the section on
the Loss of Synchronization (Error! Reference source not found.).
Example:
A switch partition has never been used. When the first controller
(A) achieves adjacency, an adjacency count will be initiated and
(A) will get an Adjacency Update message about itself with Code
field = 1. Since (A) receives an adjacency count of 1 this
indicates that it only controller for that partition.
When a second adjacency (B), using the same Partition ID, achieves
adjacency, the adjacency counter will be increased by 1.Both (A)
and (B) will receive an Adjacency Update message indicating
adjacency count of 2 in the Code field. Since the count is greater
than 1, this will indicate to both (A) and (B) that there is
another controller interacting with the switch; indentification of
the other controller will not be provided by GSMP, but will be the
responsibility of the controllers. .
If (A) looses adjacency, the adjacency count will be decreased and
an Adjacency Update message will be sent to (B) indicating
adjacency count of 1 in the Code field. If (B) leaves as well, the
partition is regarded as idle and the adjacency count may be
reset.
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12. Summary of Failure Response Codes
[Editor's note: this section is currently out of whack w.r.t. the
rest of the spec and will be updated in a future revision of the
draft.]
The following list gives a summary of the failure codes defined
for failure response messages:
1: Unspecified reason not covered by other failure codes.
2: Invalid request message.
3: The specified request is not implemented on this switch.
4: Invalid Port Session Number.
N1: Invalid Partition ID
5: One or more of the specified ports does not exist.
6: One or more of the specified ports is down.
7: Unused. (This failure code has been replaced by failure
codes 18--21.)
8: The specified connection does not exist.
9: The specified branch does not exist.
10: A branch belonging to the specified point-to-multipoint
connection is already established on the specified
output port and the switch cannot support more than a
single branch of any point-to-multipoint connection on
the same output port.
11: The limit on the maximum number of point-to-multipoint
connections that the switch can support has been
reached.
12: The limit on the maximum number of branches that the
specified point-to-multipoint connection can support has
been reached.
13: Unable to assign the requested Label value to the
requested branch on the specified point-to-multipoint
connection.
14: General problem related to the manner in which point-to-
multipoint is supported by the switch.
15: Out of resources (e.g. memory exhausted, etc.).
16: Failure specific to the particular message type. (The
meaning of this failure code depends upon the Message
Type. It is defined within the description of any
message that uses it.)
17: Cannot label each output branch of a point-to-multipoint
tree with a different label.
18: One or more of the specified input VPIs is invalid.
19: One or more of the specified input VCIs is invalid.
20: One or more of the specified output VPIs is invalid.
21: One or more of the specified output VCIs is invalid.
22: Invalid Class of Service field in a Connection Management
message.
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23: Insufficient resources for QoS Profile.
24: Virtual path switching is not supported on this input
port.
25: Point-to-multipoint virtual path connections are not
supported on either the requested input port or the
requested output port.
26: Attempt to add a virtual path connection branch to an
existing virtual channel connection.
27: Attempt to add a virtual channel connection branch to an
existing virtual path connection.
28: Only point-to-point bi-directional connections may be
established.
29: Cannot support requested VPI range.
30: Cannot support requested VCI range on all requested VPIs.
31: The transmit cell rate of this output port cannot be
changed.
32: Requested transmit cell rate out of range for this output
port.
128: Weighted scheduling within this waiting room is
unavailable.
129: This waiting room is unable to offer weighted sharing for
a QoS class.
130: This waiting room is unable to offer weighted sharing for
a connection.
131: Scheduler Identifier still in use.
132: QoS Class Identifier still in use.
133: Invalid QoS parameter.
134: Insufficient QoS resources.
135: Any point-to-multipoint connection arriving on this input
port must use the same QoS parameters for all output
branches.
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13. Summary of Message Set
[Editor's note: this section is currently out of whack w.r.t. the
rest of the spec and will be updated in a future revision of the
draft.]
The following table gives a summary of the messages defined in
this version of the specification. It also indicates which
messages must be supported in a minimal implementation of the
protocol. Those messages marked as "Required" must be supported by
the switch for an implementation to be considered to conform to
this specification. (While the controller should also implement
those messages marked "Required," conformance cannot be tested for
the controller due to the Master-Slave nature of the protocol.)
Message Name Message Type Status
Connection Management Messages
Add Branch VCC....................16 Required
VPC....................26
Delete Tree.......................18
Delete All........................20
Delete Branches...................17 Required
Move Branch VCC...................22
VPC...................27
Port Management Messages
Port Management...................32 Required
Label Range.......................33
State and Statistics Messages
Connection Activity...............48
Port Statistics...................49 Required
Connection Statistics.............50
Report Connection State...........52
Configuration Messages
Switch Configuration..............64 Required
Port Configuration................65 Required
All Ports Configuration...........66 Required
Service Configuration.............N2
Reservation Messages
Reservation Request.............. 70
Delete Reservation................71
Delete All Reservations...........72
Event Messages
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Port Up...........................80
Port Down.........................81
Invalid Label.....................82
New Port..........................83
Dead Port.........................84
Abstract and Resource Model Extension Messages
Reserved..........................200-249
Adjacency Protocol....................10 Required
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14. Security Considerations
The security of GSMP's TCP/IP control channel has been addressed
in [15]. Any potential remaining security considerations are not
addressed in the current revision of this draft.
References
[1] "B-ISDN ATM Layer Specification," International
Telecommunication Union, ITU-T Recommendation I.361, Mar.
1993.
[2] "B-ISDN ATM Adaptation Layer (AAL) Specification,"
International Telecommunication Union, ITU-T
Recommendation I.363, Mar. 1993.
[3] IEEE/WG 1520, Adam, C; Lazar, A; Nanadikesan, M; "Proposal
for Standaridizing the qGSMP protocol", P1520/TS/ATM-002,
http://comet.columbia.edu/pin-atm/docs/P1520-TS-ATM-
002R1.pdf, 19 Jan, 1999
[4] Sjostrand, H., "Definitions of Managed Objects for the
General Switch Management Protocol (GSMP)," Internet-Draft
draft-ietf-gsmp-mib-00, September 1999.
[5] Reynolds, J., and J. Postel, "Assigned Numbers," STD 2,
RFC 1700, October 1994.
[6] Newman, P, Edwards, W., Hinden, R., Hoffman, E. Ching
Liaw, F., Lyon, T. and Minshall, G., "Ipsilon's General
Switch Management Protocol Specification," Version 1.1,
RFC 1987, August 1996.
[7] Newman, P, Edwards, W., Hinden, R., Hoffman, E., Ching
Liaw, F., Lyon, T. and Minshall, G., "Ipsilon's General
Switch Management Protocol Specification," Version 2.0,
RFC 2397, March 1998.
[8] ATM Forum Technical Committee, "Traffic Management
Specification Version 4.1," af-tm-0121.000, xxx 1999.
[9] J. Wroclawski, "Specification of the Controlled-Load
Network Element Service," RFC2211, Sep 1997.
[10] B. Jamoussi, et. al. "Constraint-Based LSP Setup using
LDP," Internet Draft draft-ietf-mpls-cr-ldp-03.txt, Feb
1999.
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[11] ITU-T Recommendation I.233 Frame Mode Bearer Services
1992.
[12] ITU-T Recommendation Q.933, Integrated Services Digital
Network (ISDN) Digital Subscriber Signalling System No. 1
(DSS 1) ¡ Signalling Specifications For Frame Mode
Switched And Permanent Virtual Connection Control And
Status Monitoring, 1995.
[13] ITU-T Recommendation Q.922, Integrated Services Digital
Network (ISDN) Data Link Layer Specification For Frame
Mode Bearer Services, 1992
[14] E. Rosen, et al, "MPLS Label Stack Encoding" Internet-
Draft draft-ietf-mpls-label-encaps-07.txt, Sep 1999.
[15] T. Worster, "GSMP Packet Encapsulations for ATM, Ethernet
and TCP," Internet-Draft draft-ietf-gsmp-encaps-00, Jan
2000.
Authors' Addresses
Avri Doria
Nokia Telecommunications
5 Wayside Road
Burlington MA 01803
Phone: +1 781 993 4656
avri.doria@nokia.com
Fiffi Hellstrand
Nortel Networks AB
S:T Eriksgatan 115 A
P.O. Box 6701
SE-113 85 Stockholm Sweden
fiffi@nortelnetworks.com
Kenneth Sundell
Nortel Networks AB
S:T Eriksgatan 115 A
P.O. Box 6701
SE-113 85 Stockholm Sweden
ksundell@nortelnetworks.com
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Tom Worster (Editor)
Ennovate Networks
60 Codman Hill Rd
Boxboro MA 01719 USA
Tel +1 978-263-2002
fsb@thefsb.org
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