Advertising SRv6 SIDs for Layer 2 Bundle Member Links in IGP
draft-dong-lsr-l2bundle-srv6-00

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LSR Routing Working Group                                        J. Dong
Internet-Draft                                                     Z. Hu
Intended status: Standards Track                     Huawei Technologies
Expires: August 24, 2021                               February 20, 2021

      Advertising SRv6 SIDs for Layer 2 Bundle Member Links in IGP
                    draft-dong-lsr-l2bundle-srv6-00

Abstract

   There are deployments where the Layer-3 interface on which IGP
   operates is a Layer-2 interface bundle.  Existing IGP advertisements
   only support advertising link attributes of the Layer-3 interface.
   If entities external to IGP wish to control traffic flows on the
   individual physical links that comprise the Layer-2 interface bundle,
   link attribute information about the bundle members is advertised by
   IGP extensions for Layer-2 (L2) bundle.

   When Segment Routing over IPv6 (SRv6) is used with Layer-2 interface
   bundle to control traffic flows on the individual member links, the
   SRv6 SIDs which represent the Layer 2 member links of the L2 bundle
   needs to be advertised in IGP.

   This document proposes the IGP extensions to advertise the SRv6 SIDs
   of the Layer 2 (L2) bundle member links.

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.

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Dong & Hu                Expires August 24, 2021                [Page 1]
Internet-Draft           IGP L2 bundle for SRv6            February 2021

   This Internet-Draft will expire on August 24, 2021.

Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  SRv6 Function for L2 Bundle Member Links  . . . . . . . . . .   3
   4.  Advertising SRv6 SIDs for L2 Bundle Members . . . . . . . . .   3
     4.1.  SRv6 SIDs Encodings for IS-IS L2 Bundle . . . . . . . . .   3
       4.1.1.  L2 Bundle Member SRv6 End.XU SID Sub-TLV  . . . . . .   4
       4.1.2.  L2 Bundle Member SRv6 LAN End.XU SID Sub-TLV  . . . .   5
     4.2.  SRv6 SIDs Encodings for OSPF L2 Bundle  . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   There are deployments where the Layer-3 interface on which an IGP
   adjacency is established is a Layer-2 interface bundle, for instance,
   a Link Aggregation Group (LAG) [IEEE802.1AX].  This reduces the
   number of adjacencies that need to be maintained by the routing
   protocol in cases where there are parallel links between the
   neighbors.  Entities external to IS-IS such as Path Computation
   Elements (PCEs) [RFC4655] may wish to control traffic flows on
   individual members of the underlying Layer-2 bundle.  In order to do
   so, link attribute information about individual bundle members is
   required.

Dong & Hu                Expires August 24, 2021                [Page 2]
Internet-Draft           IGP L2 bundle for SRv6            February 2021

   [RFC8668] and [I-D.ietf-lsr-ospf-l2bundles] specify the IGP