SRv6 Point-to-Multipoint Path
draft-chen-pim-srv6-p2mp-path-00

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Last updated 2020-07-12
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Network Working Group                                            H. Chen
Internet-Draft                                                M. McBride
Intended status: Standards Track                               Futurewei
Expires: January 13, 2021                                         Y. Fan
                                                            Casa Systems
                                                                  M. Toy
                                                                 Verizon
                                                                 A. Wang
                                                           China Telecom
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                           July 12, 2020

                     SRv6 Point-to-Multipoint Path
                    draft-chen-pim-srv6-p2mp-path-00

Abstract

   This document describes a solution for a SRv6 Point-to-Multipoint
   (P2MP) Path/Tree to deliver the traffic from the ingress of the path
   to the multiple egresses/leaves of the path in a SR domain.  There is
   no state stored in the core of the network for a SR P2MP path like a
   SR Point-to-Point (P2P) path in this solution.

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].

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   provisions of BCP 78 and BCP 79.

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Chen, et al.            Expires January 13, 2021                [Page 1]
Internet-Draft               SRv6 P2MP Path                    July 2020

   This Internet-Draft will expire on January 13, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Overview of P2MP Multicast Tree . . . . . . . . . . . . . . .   3
   3.  Encoding P2MP Multicast Tree  . . . . . . . . . . . . . . . .   5
   4.  Procedures/Behaviors  . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Procedure/Behavior on Ingress Node  . . . . . . . . . . .   7
     4.2.  Procedure/Behavior on Transit Node  . . . . . . . . . . .   8
     4.3.  Procedure/Behavior on Egress Node . . . . . . . . . . . .   9
   5.  Protection  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Global Protection . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Local Protection  . . . . . . . . . . . . . . . . . . . .  10
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   The Segment Routing (SR) for unicast or Point-to-Point (P2P) path is
   described in [RFC8402].  For SR multicast or Point-to-Multipoint
   (P2MP) path/tree, it may be implemented through using multiple SR P2P
   paths.  The function of a SR P2MP path/tree from an ingress node to
   multiple (say n) egress/leaf nodes is implemented by n SR P2P paths.
   These n P2P paths are from the ingress to those n egress/leaf nodes
   of the P2MP path/tree.  This solution may waste some network
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