Interdomain Routing Working Group X. Geng
Internet-Draft M. Chen
Intended status: Standards Track Huawei
Expires: April 25, 2019 Z. Li
China Mobile
October 22, 2018
IGP-TE Extensions for DetNet Information Distribution
draft-geng-detnet-info-distribution-03
Abstract
This document extends the IGP-TE, including OSPF-TE and ISIS-TE, to
support DetNet by specifying new information that can be placed in
Link State Protocol Data Units (LSP). This information describes
additional details regarding the state of the network that are useful
for DetNet computations.
Requirements Language
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].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 25, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. DetNet Extensions to OSPF TE . . . . . . . . . . . . . . . . 4
3.1. DetNet Node Attributes Advertisement . . . . . . . . . . 4
3.1.1. Packet Processing Delay Sub-TLV . . . . . . . . . . . 4
3.1.2. PREOF Capability Sub-TLV . . . . . . . . . . . . . . 5
3.2. DetNet Link Attributtes Advertisement . . . . . . . . . . 6
3.2.1. Max DetNet Reservable Bandwidth Sub-TLV . . . . . . . 7
3.2.2. DetNet Available Bandwidth Sub-TLV . . . . . . . . . 7
3.2.3. PREOF Capability Sub-TLV . . . . . . . . . . . . . . 8
3.2.4. Queuing Algorithm Capability Sub-TLV . . . . . . . . 9
3.2.5. DetNet Queue Sub-TLV . . . . . . . . . . . . . . . . 10
4. DetNet Extensions to ISIS TE . . . . . . . . . . . . . . . . 12
4.1. DetNet Node Attributes Advertisement . . . . . . . . . . 12
4.1.1. DetNet Processing Delay Sub-TLV . . . . . . . . . . . 12
4.1.2. PREOF Capability Sub-TLV . . . . . . . . . . . . . . 13
4.2. DetNet Link Attributes Advertisement . . . . . . . . . . 14
4.2.1. Max DetNet Reservable Bandwidth Sub-TLV . . . . . . . 14
4.2.2. DetNet Available Bandwidth Sub-TLV . . . . . . . . . 15
4.2.3. PREOF Capability Sub-TLV . . . . . . . . . . . . . . 16
4.2.4. Queuing Algorithm Capability Sub-TLV . . . . . . . . 16
4.2.5. DetNet Queue Sub-TLV . . . . . . . . . . . . . . . . 17
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
5.1. Sub-TLVs for OSPF Node Attribute TLV . . . . . . . . . . 19
5.2. Sub-TLVs for OSPF Link TLV . . . . . . . . . . . . . . . 19
5.3. Sub-TLVs for ISIS Router Capability TLV . . . . . . . . . 20
5.4. Sub-TLVs for IS-IS TLVs 22, 23, 141, 222, and 223 . . . 20
6. Security Considerations . . . . . . . . . . . . . . . . . . . 20
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 20
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1. Normative References . . . . . . . . . . . . . . . . . . 20
8.2. Informative References . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 22
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1. Introduction
There are many use cases from diverse industries which have the need
in common for deterministic service, for example: audio video
production, industrial process control and mobile access networks.
The requirements can be summarized as:
Deterministic minimum and maximum end-to-end latency from source
to destination
Extremely low packet loss rate
Deterministic Networking (DetNet) can satisfy the requirements by the
following techniques:
o Congestion Protection by reserving data plane resources for DetNet
flows in intermediate nodes along the path
o Explicit Route that do not rapidly change with the network
topology
o Seamless Redundant which can distribute DetNet flow packets over
multi paths to ensure delivery of each packet spite of the loss of
a path
To make the above techniques work, it's necessary to know the
capabilities (e.g., DetNet capable or not, which congestion
protection algorithms are supported, etc.), resources (e.g, dedicated
bandwidth for DetNet, buffers, etc.), performance (e.g.,
device/queue/link delay etc.) and other relevant information of each
DetNet capable node. Then, a DetNet path computation element (e.g.,
PCE or ingress of a DetNet flow) can use these information to compute
a path that satisfies the requirement of a specific DetNet flow.
Specifically, according to the requirements stated in DetNet
architecture, the information should include:
o Bandwidth related attributes (e.g., bandwidth reserved for
DetNet);
o Buffer/queue management related attributes (e.g., queue management
algorithm, etc.);
o PREOF (Packet Replication, Ordering and Elimination Function)
capabilities and parameters (e.g., maximum out-of-order packets,
etc.);
o Delay related attributes (e.g., node processing delay, queuing
delay, link delay, etc.);
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This document defines extensions to OSPF and ISIS to distribute the
above DetNet information at node and/or link granularity.
Some of information (e.g., Link delay/loss ) can be distributed and
collected through Traffic Engineering (TE) metric extensions
[RFC7471] and [RFC7810], which are not covered by this document.
2. Terminology
All the DetNet related terminologies used in this document conform to
the DetNet architecture [I-D.ietf-detnet-architecture].
3. DetNet Extensions to OSPF TE
This document defines an extension to OSPF used to advertise DetNet
information.
3.1. DetNet Node Attributes Advertisement
New OSPF DetNet sub-TLVs for Node Attribute TLV[RFC5786] are defined
to distribute the DetNet information of a node. These sub-TLVs
include:
______________________________________________________________
| Type | Length | Value |
|------------------------------------------------------------|
| TBD1 | 8 | DetNet Processing Delay |
| TBD4 | 4 | PREOF Capability |
|________|_______________|___________________________________|
3.1.1. Packet Processing Delay Sub-TLV
In the scope of DetNet, packet processing delay, which begins after
the packet goes into the input port and ends before the packet
arrives the output buffer, can expected in a known range, and the
value of the delay bound is specified in this sub-TLV, including:
o Maximum DetNet packet processing delay
o Minimum DetNet packet processing delay
o Maximum DetNet packet processing delay variation
The format of this sub-TLV is shown in the following diagram:
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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 2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD1) | Length(8) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Minimum DetNet Processing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum DetNet Processing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum DetNet Processing Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD1.
The Length field is 2 octets in length and its value is 8.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
The Minimum DetNet Processing Delay field is 3 octets, and presents
the minimum delay for a DetNet flow in the device, excluding the
queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay field is 3 octets, and presents
the maximum delay for a DetNet flow in the device, excluding the
queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay Variation field is 3 octets in
length, and presents the maximum delay variation for a DetNet flow in
the device, excluding the queuing delay in output port. The units
are microsecond.
3.1.2. PREOF Capability Sub-TLV
PREOF (Packet Replication/Elimination/Ordering Function) is for
DetNet service protection, which includes:
o In-order delivery function: defined in Section 3.2.2.1 of
[I-D.ietf-detnet-architecture]
o Packet replication function: defined in Section 3.2.2.2 of
[I-D.ietf-detnet-architecture]
o Packet elimination function: defined in Section 3.2.2.3 of
[I-D.ietf-detnet-architecture]
This sub-TLV specifies a set of PREOF capabilities and relevant
parameters at node granularity. PREOF can also be advertised as Link
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attribute (section 3.2.3), when not all of the ports in the node
support PREOF.
The format of this sub-TLV is shown in the following diagram:
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(TBD4) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Maximum out-of-order Packet Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD4.
The Length field is 2 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|R|E|O| |
+-+-+-+-+-+-+-+-+
where:
o R-flag: replication-capability flag, which indicates whether a
link has the packet replication capability.
o E-flag: elimination-capability flag, which indicates whether a
link has the packet elimination capability
o O-flag: in-order-capability, which indicates whether a LTP has the
in-order delivery capability
Maximum out-of-order Packet Number field is 3 octet in length, and
presents the maximum number of out-of-order packets that this link
can support, it depends on the reserved buffer size for packet
reordering. This value is valid only when the O-flag is set.
3.2. DetNet Link Attributtes Advertisement
New OSPF DetNet sub-TLVs for Link TLV are defined to distribute
DetNet information of a link. These sub-TLVs include:
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______________________________________________________________
| Type | Length | Value |
|------------------------------------------------------------|
| TBD2 | 4 | Max DetNet Reservable Bandwidth |
| TBD3 | 4 | DetNet Available Bandwidth |
| TBD4 | 4 | PREOF Capability |
| TBD5 | 4 | Queuing Algorithm Capabilities |
| TBD6 | 10 | Queue Parameters |
|________|_______________|___________________________________|
3.2.1. Max DetNet Reservable Bandwidth Sub-TLV
This sub-TLV specifies the maximum amount of bandwidth that is
reserved for DetNet on this link. Note that this value SHOULD be
smaller than the value of Maximum Reservable Bandwidth sub-TLV
[RFC3630]. The value normally depends on the queuing management
algorithm and is user-configurable. In some particular queuing
management algorithm (e.g. Credit Based shaper in AVB), this value
will affect the calculation of maximum queuing delay of the DetNet
flow. The units are bytes per second.
The format of this sub-TLV is shown in the following diagram:
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(TBD2) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum DetNet Reservable Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD2.
The Length field is 2 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
This Maximum DetNet Reservable Bandwidth field is 3 octets in length,
and presents the maximum bandwidth that may be reserved for DetNet.
The units are bytes per second.
3.2.2. DetNet Available Bandwidth Sub-TLV
This sub-TLV specifies the available bandwidth that can be reserved
for DetNet flow on this link for now. Considering that there is no
generally accepted DetNet traffic classification, this value contains
all the available DetNet Bandwidth from different DetNet traffic
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classes (if there is any), which differs from the Unreserved
Bandwidth defined in [RFC3630].
The format of this sub-TLV is shown in the following diagram:
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(TBD3) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Available DetNet Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD3.
The Length field is 2 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
This Available DetNet Bandwidth field is 3 octets in length, and
presents the available bandwidth for DetNet in this link. The units
are bytes per second.
3.2.3. PREOF Capability Sub-TLV
PREOF (Packet Replication/Elimination/Ordering Function) is for
DetNet service protection, which includes :
o In-order delivery function: defined in Section 3.2.2.1 of
[I-D.ietf-detnet-architecture]
o Packet replication function: defined in Section 3.2.2.2 of
[I-D.ietf-detnet-architecture]
o Packet elimination function: defined in Section 3.2.2.3 of
[I-D.ietf-detnet-architecture]
This sub-TLV specifies a set of PREOF capabilities and relevant
parameters at link granularity. PREOF can also be advertised as node
attribute (section 3.1.2), when all of the ports in the node support
PREOF.
The format of this sub-TLV is shown in the following diagram:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD4) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Maximum out-of-order Packet Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD4.
The Length field is 2 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|R|E|O| |
+-+-+-+-+-+-+-+-+
where:
o R-flag: replication-capability flag, which indicates whether a
link has the packet replication capability.
o E-flag: elimination-capability flag, which indicates whether a
link has the packet elimination capability
o O-flag: in-order-capability, which indicates whether a LTP has the
in-order delivery capability
Maximum out-of-order Packet Number field is 3 octet in length, and
presents the maximum number of out-of-order packets that this link
can support, it depends on the reserved buffer size for packet
reordering. This value is valid only when the O-flag is set.
3.2.4. Queuing Algorithm Capability Sub-TLV
This sub-TLV specifies queuing management algorithms capabilities to
gaurante bounded queuing latency [I-D.finn-detnet-bounded-latency].
The format of this sub-TLV is shown in the following diagram:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD5) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD5.
The Length field is 2 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|C|T|H|A| |
+-+-+-+-+-+-+-+-+
where:
o C-flag: CBS flag, which indicates whether a link can support Time
Aware Shaping [IIEEE802.1Qbv].
o T-flag: TAS flag, which indicuate whether a link can support
Credit Based Shaper [IEEE802.1Q-2014]
o H-flag: CQF flag, which indicuate whether a link can support
Cyclic Queuing and Forwarding [IEEE802.1Qch]
o A-flag: ATS flag, which indicuate whether a link can support
Asynchronous Traffic Shaping [IEEE802.1Qcr]
3.2.5. DetNet Queue Sub-TLV
In the context of DetNet, the delay of queuing is bounded, and the
bound depends on what queuing management method is used and how many
buffers are allocated. This sub-TLV specifies the DetNet queue
parameters.
The format of this sub-TLV is shown in the following diagram:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD6) | Length(10) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Queue Identifier | Queue Buffer Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Maximum Queuing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Minimum Queuing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum Queuing Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD6.
The Length field is 2 octets in length and its value is 10.
The Queue Identifier field is 3 octets in length, and specifies the
identifier of a queue. It could be an internal identifier that is
only used within a node. Or it could be used by a centralized
controller to specify in which specific queue a flow/packet is
required to enter.
The Queue Buffer Size field is 3 octets in length, and specifies the
size of a queue with unit of bytes.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|C|T|H|A| |
+-+-+-+-+-+-+-+-+
where:
o C-flag: CBS flag, which indicates whether a link can support Time
Aware Shaping [IIEEE802.1Qbv].
o T-flag: TAS flag, which indicuate whether a link can support
Credit Based Shaper [IEEE802.1Q-2014]
o H-flag: CQF flag, which indicuate whether a link can support
Cyclic Queuing and Forwarding [IEEE802.1Qch]
o A-flag: ATS flag, which indicuate whether a link can support
Asynchronous Traffic Shaping [IEEE802.1Qcr]
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The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
Minimum Queuing Delay is 3 octets in length, and carries minimum
queuing delay value (in microseconds) encoded as an integer value.
Implementations may also add this to the value of Min Delay
Unidirectional Link Delay Sub-TLV [RFC7471] in order to advertise the
minimum delay of this link. Min Queuing Delay can be the same with
the Max Queuing Delay.
Maximum Queuing Delay is 3 octets in length, and carries the maximum
queuing delay value (in microseconds) encoded as an integer value.
Implementations may also add this to the value of Max Delay
Unidirectional Link Delay Sub-TLV [RFC7471]to order to advertise the
maximum delay of this link.
Maximum Queuing Delay variation is 3 octets in length, and carries
the maximum queuing delay variation value (in microseconds) encoded
as an integer value.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
4. DetNet Extensions to ISIS TE
This document defines an extension to IS-IS used to advertise DetNet
information.
4.1. DetNet Node Attributes Advertisement
The DetNet node sub-TLVs are defined within the body of the IS-IS
Router Capability TLV [RFC7981] to carry DetNet information.
4.1.1. DetNet Processing Delay Sub-TLV
This sub-TLV specifies the DetNet packet porcessing parameters. The
reader can know more about this sub-TLV referring to section 3.1.
The format of this sub-TLV is shown in the following diagram:
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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 2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD7) | Length(8) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Minimum DetNet Processing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum DetNet Processing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum DetNet Processing Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD7.
The Length field is 1 octets in length and its value is 8.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
The Minimum DetNet Processing Delay is 3 octets in length and
presents the minimum delay for a DetNet flow in the device, excluding
the queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay is 3 octets in length and
presents the maximum delay for a DetNet flow in the device, excluding
the queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay Variation is 3 octets in length
and presents the maximum delay variation for a DetNet flow in the
device, excluding the queuing delay in output port. The units are
microsecond.
4.1.2. PREOF Capability Sub-TLV
This sub-TLV specifies a set of PREOF capabilities and relevant
parameters in sub-TLV. The reader can know more about this sub-TLV
referring to section 3.4.
The format of this sub-TLV is shown in the following diagram:
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(TBD10) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Maximum out-of-order Packet Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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The Type field is 1 octets in length, and the value is TBD10.
The Length field is 1 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|R|E|O| |
+-+-+-+-+-+-+-+-+
where:
o R-flag: replication-capability flag, which indicates whether a
link has the packet replication capability.
o E-flag: elimination-capability flag, which indicates whether a
link has the packet elimination capability
o O-flag: in-order-capability, which indicates whether a LTP has the
in-order delivery capability
Maximum out-of-order Packet Number field is 3 octets in length and
presents the maximum number of out-of-order packets that this link
can support, it depends on the reserved buffer size for packet
reordering. This value is valid only when the O-flag is set.
4.2. DetNet Link Attributes Advertisement
This document defines new IS-IS TE sub-TLVs that can be announced in
the TLVs 22, 23, 141, 222, and 223 in order to distribute DetNet
information. The sub-TLV extensions below build on the ones provided
in [RFC5305], [RFC5316]and [RFC7310]
4.2.1. Max DetNet Reservable Bandwidth Sub-TLV
This sub-TLV specifies the maximum amount of bandwidth that is
reserved for DetNet on this link. Note that this value SHOULD be
smaller than the value of Maximum Reservable Link Bandwidth
[RFC5305]. The reader can know more about this sub-TLV referring to
section 3.2.
The format of this sub-TLV is shown in the following diagram:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD8) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum DetNet Reservable Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD8.
The Length field is 1 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
This Maximum DetNet Reservable Bandwidth field is 3 octets in length
and presents the maximum bandwidth that may be reserved for DetNet.
The units are bytes per second.
4.2.2. DetNet Available Bandwidth Sub-TLV
This sub-TLV specifies the available bandwidth that can be reserved
for DetNet flow on this link for now. It is different from the
Unreserved Bandwidth sub-TLV defined in [RFC5305] referring to
section 3.3.
The format of this sub-TLV is shown in the following diagram:
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(TBD9) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Available DetNet Bandwidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD9.
The Length field is 1 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
This Available DetNet Bandwidth field is 3 octets in length and
presents the available bandwidth for DetNet in this link. The units
are bytes per second.
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4.2.3. PREOF Capability Sub-TLV
This sub-TLV specifies a set of PREOF capabilities and relevant
parameters in sub-TLV. The reader can know more about this sub-TLV
referring to section 3.4.
The format of this sub-TLV is shown in the following diagram:
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(TBD10) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Maximum out-of-order Packet Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD10.
The Length field is 1 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|R|E|O| |
+-+-+-+-+-+-+-+-+
where:
o R-flag: replication-capability flag, which indicates whether a
link has the packet replication capability.
o E-flag: elimination-capability flag, which indicates whether a
link has the packet elimination capability
o O-flag: in-order-capability, which indicates whether a LTP has the
in-order delivery capability
Maximum out-of-order Packet Number field is 3 octets in length and
presents the maximum number of out-of-order packets that this link
can support, it depends on the reserved buffer size for packet
reordering. This value is valid only when the O-flag is set.
4.2.4. Queuing Algorithm Capability Sub-TLV
This sub-TLV specifies queuing management algorithms capabilities to
gaurante bounded queuing latency [I-D.finn-detnet-bounded-latency].
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The format of this sub-TLV is shown in the following diagram:
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(TBD11) | Length(4) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD11.
The Length field is 1 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|C|T|H|A| |
+-+-+-+-+-+-+-+-+
where:
o C-flag: CBS flag, which indicates whether a link can support Time
Aware Shaping [IIEEE802.1Qbv].
o T-flag: TAS flag, which indicuate whether a link can support
Credit Based Shaper [IEEE802.1Q-2014]
o H-flag: CQF flag, which indicuate whether a link can support
Cyclic Queuing and Forwarding [IEEE802.1Qch]
o A-flag: ATS flag, which indicuate whether a link can support
Asynchronous Traffic Shaping [IEEE802.1Qcr]
4.2.5. DetNet Queue Sub-TLV
In the context of DetNet, the delay of queuing is bounded, and the
bound depends on what queuing management method is used and how many
buffers are allocated. This sub-TLV specifies the DetNet queue
parameters.
The format of this sub-TLV is shown in the following diagram:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type(TBD12) | Length(10) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Queue Identifier | Queue Buffer Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Maximum Queuing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Minimum Queuing Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Maximum Queuing Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD12.
The Length field is 1 octets in length and its value is 10.
The Queue Identifier field specifies the identifier of a queue. It
could be an internal identifier that is only used within a node. Or
it could be used by a centralized controller to specify in which
specific queue a flow/packet is required to enter.
The Queue Buffer Size field specifies the size of a queue with unit
of bytes.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8
+-+-+-+-+-+-+-+-+
|C|T|H|A| |
+-+-+-+-+-+-+-+-+
where:
o C-flag: CBS flag, which indicates whether a link can support Time
Aware Shaping [IIEEE802.1Qbv].
o T-flag: TAS flag, which indicuate whether a link can support
Credit Based Shaper [IEEE802.1Q-2014]
o H-flag: CQF flag, which indicuate whether a link can support
Cyclic Queuing and Forwarding [IEEE802.1Qch]
o A-flag: ATS flag, which indicuate whether a link can support
Asynchronous Traffic Shaping [IEEE802.1Qcr]
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The RESERVED field is reserved for future use. It MUST be set to 0
when sent and MUST be ignored when received.
Minimum Queuing Delay is 3 octets in length and presents minimum
queuing delay value (in microseconds) encoded as an integer value.
Implementations may also add this to the value of Min Delay
Unidirectional Link Delay Sub-TLV [RFC7471] in order to advertise the
minimum delay of this link. Min Queuing Delay can be the same with
the Max Queuing Delay.
Maximum Queuing Delay is 3 octets in length and presents the maximum
queuing delay value (in microseconds) encoded as an integer value.
Implementations may also add this to the value of Max Delay
Unidirectional Link Delay Sub-TLV [RFC7471]to order to advertise the
maximum delay of this link.
Maximum Queuing Delay variation is 3 octets in length and presents
the maximum queuing delay variation value (in microseconds) encoded
as an integer value.
5. IANA Considerations
5.1. Sub-TLVs for OSPF Node Attribute TLV
IANA is requested to register the OSPF sub-TLVs defined in this
document in the sub-TLVs for Node Attribute TLV registry.
Type Description
---- ------------------------------
TBD1 Packet Processing Delay
TBD2 PREOF Capability
5.2. Sub-TLVs for OSPF Link TLV
IANA is requested to register the OSPF sub-TLVs defined in this
document in the sub-TLVs for Link TLV registry.
Type Description
---- ------------------------------
TBD3 Maximum DetNet Reservable Bandwidth
TBD4 DetNet Available Bandwidth
TBD5 PREOF Capability
TBD6 Queuing Algorithm Capabilities
TBD7 Queue Parameters
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5.3. Sub-TLVs for ISIS Router Capability TLV
IANA is requested to register the ISIS sub-TLVs defined in this
document in the sub-TLVs for Router Capability TLV registry.
Type Description
---- ------------------------------
TBD8 Packet Processing Delay
TBD9 PREOF Capability
5.4. Sub-TLVs for IS-IS TLVs 22, 23, 141, 222, and 223
IANA is requested to register the ISIS sub-TLVs defined in this
document in the Sub-TLVs for TLVs 22, 23, 141, 222, and 223 registry.
Type Description
---- ------------------------------
TBD10 Maximum DetNet Reservable Bandwidth
TBD11 DetNet Available Bandwidth
TBD12 PREOF Capability
TBD13 Queuing Algorithm Capabilities
TBD14 Queue Parameters
6. Security Considerations
This document does not introduce security issues beyond those
discussed in [RFC7471] and [RFC7810].
7. Acknowledgements
8. References
8.1. Normative References
[I-D.finn-detnet-bounded-latency]
Finn, N., Boudec, J., Mohammadpour, E., Varga, B., and J.
Farkas, "DetNet Bounded Latency", draft-finn-detnet-
bounded-latency-01 (work in progress), July 2018.
[I-D.ietf-detnet-architecture]
Finn, N., Thubert, P., Varga, B., and J. Farkas,
"Deterministic Networking Architecture", draft-ietf-
detnet-architecture-08 (work in progress), September 2018.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
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[RFC5786] Aggarwal, R. and K. Kompella, "Advertising a Router's
Local Addresses in OSPF Traffic Engineering (TE)
Extensions", RFC 5786, DOI 10.17487/RFC5786, March 2010,
<https://www.rfc-editor.org/info/rfc5786>.
[RFC7471] Giacalone, S., Ward, D., Drake, J., Atlas, A., and S.
Previdi, "OSPF Traffic Engineering (TE) Metric
Extensions", RFC 7471, DOI 10.17487/RFC7471, March 2015,
<https://www.rfc-editor.org/info/rfc7471>.
[RFC7810] Previdi, S., Ed., Giacalone, S., Ward, D., Drake, J., and
Q. Wu, "IS-IS Traffic Engineering (TE) Metric Extensions",
RFC 7810, DOI 10.17487/RFC7810, May 2016,
<https://www.rfc-editor.org/info/rfc7810>.
[RFC7981] Ginsberg, L., Previdi, S., and M. Chen, "IS-IS Extensions
for Advertising Router Information", RFC 7981,
DOI 10.17487/RFC7981, October 2016,
<https://www.rfc-editor.org/info/rfc7981>.
8.2. Informative References
[IEEE802.1Q-2014]
"MAC Bridges and VLANs (IEEE 802.1Q-2014)", 2014.
[IEEE802.1Qch]
"Cyclic Queuing and Forwarding", 2016.
[IEEE802.1Qcr]
"Asynchronous Traffic Shaping", 2016.
[IIEEE802.1Qbv]
"Enhancements for Scheduled Traffic", 2016.
[RFC3630] Katz, D., Kompella, K., and D. Yeung, "Traffic Engineering
(TE) Extensions to OSPF Version 2", RFC 3630,
DOI 10.17487/RFC3630, September 2003,
<https://www.rfc-editor.org/info/rfc3630>.
[RFC5305] Li, T. and H. Smit, "IS-IS Extensions for Traffic
Engineering", RFC 5305, DOI 10.17487/RFC5305, October
2008, <https://www.rfc-editor.org/info/rfc5305>.
[RFC5316] Chen, M., Zhang, R., and X. Duan, "ISIS Extensions in
Support of Inter-Autonomous System (AS) MPLS and GMPLS
Traffic Engineering", RFC 5316, DOI 10.17487/RFC5316,
December 2008, <https://www.rfc-editor.org/info/rfc5316>.
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[RFC7310] Lindsay, J. and H. Foerster, "RTP Payload Format for
Standard apt-X and Enhanced apt-X Codecs", RFC 7310,
DOI 10.17487/RFC7310, July 2014,
<https://www.rfc-editor.org/info/rfc7310>.
Authors' Addresses
Xuesong Geng
Huawei
Email: gengxuesong@huawei.com
Mach(Guoyi) Chen
Huawei
Email: mach.chen@huawei.com
Zhenqiang
China Mobile
Email: lizhenqiang@chinamobile.com
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