IGP Extensions for Shorter SRv6 SID
draft-chen-lsr-igp-shorter-srv6-extensions-02
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LSR WG Ran. Chen
Internet-Draft Shaofu. Peng
Intended status: Standards Track ZTE Corporation
Expires: November 9, 2020 May 8, 2020
IGP Extensions for Shorter SRv6 SID
draft-chen-lsr-igp-shorter-srv6-extensions-02
Abstract
This document describes the IGP extensions required to support the
Shorter SRv6 SIDs( Compressing SRv6 SIDs).
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Task Force (IETF). Note that other groups may also distribute
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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 November 9, 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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described in the Simplified BSD License.
Chen & Peng Expires November 9, 2020 [Page 1]
Internet-Draft IGP for Shorter SRv6 SID May 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Advertising Shorter SRv6 SIDs capabilities. . . . . . . . . . 2
2.1. IS-IS Extensions . . . . . . . . . . . . . . . . . . . . 2
2.2. OSPFv3 Extensions . . . . . . . . . . . . . . . . . . . . 4
3. Advertising SRv6 SID Structure Sub-Sub-TLV . . . . . . . . . 5
4. Advertising Endpoint Behaviors with U-Flavor . . . . . . . . 6
5. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8. Normative References . . . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
Segment Routing [RFC8402] leverages the source routing paradigm. An
ingress node steers a packet through an ordered list of
instructions,called segments.
Segment Routing can be directly instantiated on the IPv6 data plane
through the use of the Segment Routing Header defined in [RFC8754].
SRv6 refers to this SR instantiation on the IPv6 dataplane.
However, the size of the SRv6 SID presents a scalabilities challenge
to use topological instructions that define a strict explicitly
routed path in combination with service-based instructions. At the
same time, the size of the SRH/SID may be a challenge for some data
plane processors and traffic overhead.
[I-D.cheng-spring-shorter-srv6-sid-requirement] describes a list of
requirements for the use of a shortened identifier in a segment
routing network with the IPv6 data plane.
[I-D.mirsky-6man-unified-id-sr] proposed an extension of SRH that
enables the use of a shorter segment identifier in dataplane, such as
32-bits Label format SID or 32-bits IP address format SID.
This document defines extensions to IGP in order to to support the
Shorter SRv6 SIDs contained in SID list that installed in dataplane.
2. Advertising Shorter SRv6 SIDs capabilities.
2.1. IS-IS Extensions
A node indicates that it supports the SR Segment Endpoint Node
functionality as specified in [RFC8754] by advertising a new SRv6
Capabilities sub-TLV [I-D.ietf-lsr-isis-srv6-extensions] of the
router capabilities TLV [RFC7981].
Chen & Peng Expires November 9, 2020 [Page 2]
Internet-Draft IGP for Shorter SRv6 SID May 2020
This document extensions the flags field in the SRv6 Capabilities
sub-TLV [I-D.ietf-lsr-isis-srv6-extensions] to indicate the node
supports the Shorter SRv6 SIDs.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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