Network Working Group D. Papadimitriou
Internet Draft Alcatel-Lucent
Updates: 3471, 3473 January 20, 2010
Intended status: Standards Track
Expires: July 19, 2010
Ethernet Traffic Parameters
draft-ietf-ccamp-ethernet-traffic-parameters-10.txt
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Abstract
This document describes the support of Metro Ethernet Forum (MEF)
Ethernet Traffic Parameters as described in MEF10.1 when using
Generalized Multi-Protocol Label Switching (GMPLS) Resource
ReSerVation Protocol - Traffic Engineering (RSVP-TE) signaling.
1. Introduction
Per [RFC3471], Generalized Multi-Protocol Label Switching (GMPLS)
allows the inclusion of technology specific parameters in
signaling. Ethernet SENDER_TSPEC and FLOWSPEC specific objects
are introduced in this document that supports Metro Ethernet
Forum (MEF) Ethernet traffic parameters as specified in [MEF10.1]
and ITU-T Ethernet Service Switching as discussed in [GMPLS-
ESVCS]. For example:
o For Ethernet Private Line (EPL) services [MEF6], these traffic
parameters are applicable to each Ethernet Virtual Connection
(EVC) crossing a given port.
o For Ethernet Virtual Private Line (EVPL) services [MEF6], these
traffic parameters are applicable per Ethernet Virtual
Connection (EVC) with single or multiple Class of Service
(CoS), independent of its associated (set of) Virtual LAN ID
(VID).
Association between EVC and VIDs is detailed in [MEF10.1]. The
format and encoding of the (set of) VIDs is documented in a
companion document [GMPLS-ESVCS].
This does not preclude broader usage of the Ethernet SENDER_TSPEC
and FLOWSPEC specific objects specified this document. For
instance, they may also be used for signaling Ethernet Label
Switched Paths (LSP): in the Generalized Label Request (see
[RFC3471]), the Switching Type field is set to Layer 2 Switching
Capability (L2SC) and the LSP Encoding Type field to Ethernet.
2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
RFC-2119 [RFC2119].
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Moreover, the reader is assumed to be familiar with the
terminology [MEF10.1] as well as [RFC3471] and [RFC3473].
3. Overview
In GMPLS RSVP-TE [RFC3473] the SENDER_TSPEC object is used on a
Path message to indicate the bandwidth that is requested for the
LSP being established, and the FLOWSPEC object is used on a Resv
message to indicate the bandwidth actually reserved for the LSP.
The Ethernet SENDER_TSPEC/FLOWSPEC object includes the Ethernet
link type (switching granularity) of the requested LSP and the
MTU value for the LSP. Other information about the requested
bandwidth characteristics of the LSP are carried in the Bandwidth
Profile as a TLV within the Ethernet SENDER_TSPEC/FLOWSPEC
object.
The Ethernet SENDER_TSPEC/FLOWSPEC object includes the Ethernet
link type (switching granularity) of the requested LSP and the
MTU value for the LSP.
The Bandwidth Profile defines the set of traffic parameters
applicable to a sequence of Service Frames, referred to as
bandwidth profile parameters (as specified in [MEF10.1]):
o Committed Rate: indicates the rate at which traffic commits to
be sent to the Ethernet LSP. The Committed Rate is described in
terms of the CIR (Committed Information Rate) and CBS
(Committed Burst Size) traffic parameters.
o CIR is defined as the average rate (in bytes per unit of
time) up to which the network is committed to transfer frames
and meets its performance objectives.
o CBS defines a limit on the maximum number of information
units (e.g., bytes) available for a burst of frames sent at
the interface speed to remain CIR-conformant.
o Excess Rate: indicates the extent by which the traffic sent on
an Ethernet LSP exceeds the committed rate. The Excess Rate is
described in terms of the EIR (Excess Information Rate) and EBS
(Excess Burst Size) traffic parameters.
o EIR is defined as the average rate (in bytes per unit of
time), in excess of the CIR, up to which the network may
transfer frames without any performance objectives.
o EBS defines a limit on the maximum number of information unit
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(e.g., bytes) available for a burst of frames sent at the
interface speed to remain EIR-conformant.
o Color mode (CM): indicates whether the "color-aware" or "color-
blind" property is employed by the bandwidth profile.
o Coupling flag (CF): allows the choice between two modes of
operation of the rate enforcement algorithm.
4. Ethernet SENDER_TSPEC Object
The Ethernet SENDER_TSPEC object (Class-Num = 12, Class-Type =
TBA by IANA, with recommended value 6) 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length | Class-Num (12)| C-Type (6) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Switching Granularity | MTU |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ TLVs ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Switching Granularity (SG): 16 bits
This field indicates the type of link that comprises the
requested Ethernet LSP.
The permitted Ethernet Link Type values are:
Value Switching Granularity
----- ---------------------
0 Provided in signaling. See [GMPLS-ESVCS]
1 Ethernet Port (for port-based service)
2 Ethernet Frame (for EVC-based service)
255 Reserved value
Values 0 through 239, and 255 are assigned by IANA via IETF
Standards Action. Value 255 is reserved by the
present document.
Values 240 through 254 are reserved for Private Use.
Values 256 through 65535 are not to be assigned at this time.
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MTU: 16 bits
This is a two-octet value indicating the MTU in octets.
The MTU field MUST NOT take a value smaller than 46 bytes for
Ethernet V2 [ETHv2] and 38 bytes for IEEE 802.3 [IEEE802.3].
TLV (Type-Length-Value):
The Ethernet SENDER_TSPEC object MUST include at least one TLV
and MAY include more than one TLV.
Each TLV MUST 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Value ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: 16 bits
Defined values are:
Type Length Format Description
------------------------------------------------------
0 TBD Reserved Reserved value
1 TBD Reserved Reserved value
2 24 see Section 3.1 Ethernet Bandwidth
Profile [MEF10.1]
3 8 [GMPLS-ESVCS] Layer 2 Control
Processing (L2CP)
255 TBD Reserved Reserved value
Values 0 through 239, and 255 are assigned by IANA via IETF
Standards Action. Values 0 and 255 are reserved
by the present document.
Values 240 through 254 are reserved for Private Use.
Values 256 through 65535 are not to be assigned at this
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time.
Length: 16 bits
Indicates the length in bytes of the whole TLV including
the Type and Length fields. A value field whose length is
not a multiple of four MUST be zero-padded (with trailing
zeros) so that the TLV is four-octet aligned.
4.1. Ethernet Bandwidth Profile TLV
The Type 2 TLV specifies the Ethernet Bandwidth Profile (BW
profile). It defines an upper bound on the volume of the expected
service frames belonging to a particular Ethernet service
instance. The Ethernet SENDER_TSPEC object MAY include more than
one Ethernet Bandwidth Profile TLV.
The Type 2 TLV 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Profile | Index | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| CIR |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| CBS |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EIR |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| EBS |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Profile: 8 bits (this field is to be registered by IANA)
This field is defined as a bit vector of binary flags. The
following flags are defined:
Flag 1 (bit 0): coupling flag (CF)
Flag 2 (bit 1): color mode (CM)
Where bit 0 is the low order bit. Other flags are reserved,
they SHOULD be set to zero when sent, and SHOULD be ignored
when received.
A flag is set to value 1 to indicate that the corresponding
metering profile is requested.
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The Flag 1 (CF) allows the choice between two modes of
operation of the rate enforcement algorithm.
The Flag 2 (CM) indicates whether the color-aware or color-
blind property is employed by the bandwidth profile. When Flag
2 is set to value 0 (1), the bandwidth profile algorithm is
said to be in color blind (color aware) mode.
Index: 8 bits
The index field is used to reference bandwidth allocated for a
given traffic class in case a multiple-class LSP is being
requested. The index field value MUST correspond to at least
one of the Class-Type values included either in the CLASSTYPE
object [RFC4124] or in the EXTENDED_CLASSTYPE object [MCOS].
A given index value j can be associated to at most N Class-
Type values CTi (i =< N) of the EXTENDED_CLASSTYPE object.
This applies in case a set of one or more CTi maps a single
(shared) BW profile. An example of value setting consists then
in assigning an arbitrary value comprised within the range
[0x08,0xF8[ associated to a set of CTi, the values in the
range [0xF8,0xFF] being selected for reserved sets. This
allows mapping to one of 248 pre-defined CTi sets.
A given index value j can be associated to a single CTi (1:1
correspondence). In this case, the index value setting
consists then in assigning the 3 LSB of the index field itself
to the CTi value itself (comprised in the range [0x00,0x07]).
This applies in case a single CTi maps a single (dedicated) BW
profile or multiple (dedicated) BW profiles. In the former
case (single BW profile), the Ethernet SENDER_TSPEC object
includes a single Ethernet Bandwidth Profile TLV. In the
second case, the Ethernet SENDER_TSPEC includes a set of more
than one Ethernet Bandwidth Profile TLVs (whose respective
Index value is associated to a single CTi value).
Note that the current specification allows for combining
shared and dedicated BW profiles to the same LSP. That is, an
Ethernet SENDER_TSPEC object MAY include multiple Ethernet
Bandwidth Profile TLVs whose respective index can be
associated on a 1:1 basis to a single CTi or to a set of
multiple CTi.
For each subobject of the EXTENDED_CLASSTYPE object [MCOS]:
o Each CTi value SHOULD correspond 1:1 to MEF CE VLAN-CoS
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o The BW requested per CTi field MAY be used for bandwidth
accounting purposes.
By default, the value of the Index field MUST be set to 0.
Reserved: 16 bits
These bits SHOULD be set to zero when sent and MUST be ignored
when received.
CIR (Committed Information Rate): 32 bits
The value of the CIR is in units of bytes per second. The CIR
is encoded as a 32-bit IEEE single-precision floating-point
number (see [RFC4506]).
The CIR value MUST be greater than or equal to 0.
CBS (Committed Burst Size): 32 bits
The value of the CBS is in units of bytes. The CBS is encoded
as a 32-bit IEEE single-precision floating-point number (see
[RFC4506]).
When CIR is strictly greater than 0 (CIR > 0), the CBS MUST be
greater than or equal to the maximum frame size.
EIR (Excess Information Rate): 32 bits
The value of the EIR is in units of bytes per second. The EIR
is encoded as a 32-bit IEEE single-precision floating-point
number (see [RFC4506]).
The EIR value MUST be greater than or equal to 0.
EBS (Excess Burst Size): 32 bits
The value of the EBS is in units of bytes. The EBS is encoded
as a 32-bit IEEE single-precision floating-point number (see
[RFC4506]).
When EIR is strictly greater than 0 (EIR > 0), the EBS MUST be
greater than or equal to the maximum frame size.
5. Ethernet FLOWSPEC Object
The Ethernet FLOWSPEC object (Class-Num = 12, Class-Type = TBA by
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IANA, with recommended value 6) has the same format as the
Ethernet SENDER_TSPEC object.
6. Ethernet ADSPEC Object
There is no ADSPEC object associated with the Ethernet
SENDER_TSPEC object.
Either the ADSPEC object is omitted or an IntServ ADSPEC with the
Default General Characterization Parameters and Guaranteed
Service fragment is used, see [RFC2210].
7. Processing
The Ethernet SENDER_TSPEC and FLOWSPEC objects specified in this
document MAY be used for signaling Ethernet LSP. For signaling
such LSP, in the Generalized LABEL_REQUEST object (see
[RFC3471]), the Switching Type field MUST be set to the value 51
(L2SC) and the LSP Encoding Type field MUST be set to the value 2
(Ethernet).
The Ethernet SENDER_TSPEC object carries the traffic
specification generated by the RSVP session sender. The Ethernet
SENDER_TSPEC object SHOULD be forwarded and delivered unchanged
to both intermediate and egress nodes.
The Ethernet FLOWSPEC object carries reservation request
information generated by receivers. As with any FLOWSPEC object,
Ethernet FLOWSPEC object flows upstream toward the ingress node.
Intermediate and egress nodes MUST verify that the node itself
and the interfaces on which the LSP will be established can
support the requested Switching Granularity, MTU and values
included in sub-object TLVs. These nodes MUST be configured with
the same pre-defined CT sets as the index value signaled as part
of the index field of the Ethernet Bandwidth Profile TLV (see
Section 4.1). If the requested value(s) can not be supported, the
receiver node MUST generate a PathErr message with the error code
"Traffic Control Error" and the error value "Service unsupported"
(see [RFC2205]).
In addition, if the MTU field is received with a value smaller
than the minimum transfer unit size of the Ethernet frame (e.g.
46 bytes for Ethernet V2, 38 bytes for IEEE 802.3), the node MUST
generate a PathErr message with the error code "Traffic Control
Error" and the error value "Bad Tspec value" (see [RFC2205]).
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Error processing of the CLASSTYPE object follows rules defined in
[RFC4124]. Error processing of the EXTENDED_CLASSTYPE object
follows rules defined in [MCOS]. Moreover, an LSR receiving a
Path message with the EXTENDED_CLASSTYPE object, which recognizes
the object and the particular Class-Type but does detect a
mismatch in the index values, MUST send a PathErr message towards
the sender with the error code "Extended Class-Type Error" and
the error value "Class-Type mismatch" (see [RFC2205]).
8. Security Considerations
This document introduces no new security considerations to either
[RFC3473].
GMPLS security is described in section 11 of [RFC3471] and refers
to [RFC3209] for RSVP-TE. Further details of MPLS-TE and GMPLS
security can be found in [MPLS-SEC].
9. IANA Considerations
IANA maintain registries and sub-registries for RSVP-TE as used
by GMPLS. IANA is requested to make allocations from these
registries as set out in the following sections.
9.1. RSVP Objects Class Types
This document introduces two new Class Types for existing RSVP
objects. IANA is requested to make allocations from the "Resource
ReSerVation Protocol (RSVP) Parameters" registry using the "Class
Names, Class Numbers, and Class Types" sub-registry.
Class Number Class Name Reference
------------ ----------------------- ---------
9 FLOWSPEC [RFC2205]
Class Type (C-Type):
6 Ethernet SENDER_TSPEC [This.I-D]
Class Number Class Name Reference
------------ ----------------------- ---------
12 SENDER_TSPEC [RFC2205]
Class Type (C-Type):
6 Ethernet SENDER_TSPEC [This.I-D]
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9.2. Ethernet Switching Granularities
IANA maintains a registry of GMPLS parameters called "Generalized
Multi-Protocol Label Switching (GMPLS) Signaling Parameters".
IANA is requested to create a new sub-registry called "Ethernet
Switching Granularities" to contain the values that may be
carried in the Switching Granularity field of the Ethernet
SENDER_TSPEC object.
Values shall be assigned as follows:
000-239,255 Assigned by IANA via IETF Standards Action
240-254 Reserved for Vendor Specific Usage
256-65535 Not assigned at this point in time
Values 256 through 65535 are not to be assigned at this time.
Before any assignments can be made in this range, there MUST be a
Standards Action that specifies IANA Considerations that covers
the range being assigned.
Initial entries in this sub-registry are as follows:
Value Switching Granularity Reference
----- -------------------------------------- ----------
0 Provided in signaling. [GMPLS-ESVCS]
1 Ethernet Port (for port-based service) [This.I-D]
2 Ethernet Frame (for EVC-based service) [This.I-D]
255 Reserved Value [This.I-D]
9.3. Ethernet Sender TSpec TLVs
IANA maintains a registry of GMPLS parameters called "Generalized
Multi-Protocol Label Switching (GMPLS) Signaling Parameters".
IANA is requested to create a new sub-registry called "Ethernet
SENDER_TSPEC TLVs" to contain the TLV type values for TLVs
carried in the Ethernet SENDER_TSPEC object.
Values shall be assigned as follows:
000-239,255 Assigned by IANA via IETF Standards Action
240-254 Reserved for Private Use
256-65535 Not assigned at this point in time
Values 256 through 65535 are not to be assigned at this time.
Before any assignments can be made in this range, there MUST be a
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Standards Action that specifies IANA Considerations that covers
the range being assigned.
Initial entries in this sub-registry are as follows:
Type Description Reference
----- -------------------------------- ---------
0 Reserved Value [This.I-D]
1 Reserved Value [This.I-D]
2 Ethernet Bandwidth Profile [This.I-D]
3 Layer 2 Control Processing (L2CP) [This.I-D]
255 Reserved Value [This.I-D]
9.4. Ethernet Bandwidth Profiles
IANA maintains a registry of GMPLS parameters called "Generalized
Multi-Protocol Label Switching (GMPLS) Signaling Parameters".
IANA is requested to create a new sub-registry called "Ethernet
Bandwidth Profiles" to contain bit flags carried in the Ethernet
Bandwidth Profile TLV of the Ethernet SENDER_TSPEC object.
Bits are to be allocated by IETF Standards Action. Bits are
numbered from bit 0 as the low order bit.
Bit Hex Description Reference
--- ---- -------------------------- -------------
0 0x01 Coupling flag (CF) [This.I-D]
1 0x02 Color mode (CM) [This.I-D]
10. Acknowledgments
Many thanks to Adrian Farrel for his comments. Lou Berger
provided the input on control traffic processing.
11. References
11.1. Normative References
[GMPLS-ESVCS] Berger, L., et al., "Generalized MPLS (GMPLS)
Support for Metro Ethernet Forum and G.8011
Ethernet Services", draft-berger-ccamp-gmpls-
ether-svcs, work in progress.
[RFC2205] Braden, R., Zhang, L., Berson, S., Herzog, S., and S.
Jamin, "Resource ReSerVation Protocol (RSVP) --
Version 1 Functional Specification", RFC 2205,
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September 1997.
[RFC2210] Wroclawski, J., "The Use of RSVP with IETF Integrated
Services", RFC 2210, September 1997.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan,
V., and G. Swallow, "RSVP-TE: Extensions to RSVP for
LSP Tunnels", RFC 3209, December 2001.
[RFC3471] Berger, L., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Functional Description",
RFC 3471, January 2003.
[RFC3473] Berger, L., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Resource ReserVation
Protocol-Traffic Engineering (RSVP-TE) Extensions",
RFC 3473, January 2003.
[RFC4124] Le Faucheur, F. et al, "Protocol extensions for
support of Diff-Serv-aware MPLS Traffic Engineering",
RFC 4124, June 2005.
[RFC4506] Eisler, M., Ed. "XDR: External Data Representation
Standard", RFC 4506, STD 67, May 2006.
11.2. Informative References
[ETHv2] Digital, Intel, and Xerox, "The Ethernet -- A Local
Area Network: Data Link Layer and Physical Layer
Specifications", Version 2.0, November 1982.
[IEEE802.3] IEEE 802.3 LAN/MAN CSMA/CD (Ethernet) Access
Method, IEEE Standard for Information technology-
Specific requirements - Part 3: Carrier Sense
Multiple Access with Collision Detection (CMSA/CD)
Access Method and Physical Layer Specifications,
IEEE 802.3-2008.
[MEF10.1] The MEF Technical Specification, "Ethernet Services
Attributes Phase 2", MEF 10.1, November 2006.
[MEF6] The Metro Ethernet Forum, "Ethernet Services
Definitions - Phase I", MEF 6, June 2004.
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[MCOS] Minei, I., et al., "Extensions for Differentiated
Services-aware Traffic Engineered LSPs", draft-minei-
diffserv-te-multi-class, work in progress.
[MPLS-SEC] Fang, L. et al., "Security Framework for MPLS and
GMPLS Networks", draft-ietf-mpls-mpls-and-gmpls-
security-framework, work in progress.
Author's Addresses
Dimitri Papadimitriou
Alcatel-Lucent Bell
Copernicuslaan 50
B-2018 Antwerpen, Belgium
Phone: +32 3 2408491
E-mail: dimitri.papadimitriou@alcatel-lucent.be
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