BGP Extensions for Services in SRv6 and MPLS Coexisting Network
draft-ls-bess-srv6-mpls-coexisting-vpn-01

Document Type Active Internet-Draft (individual)
Authors Liu Yao  , Bing Song 
Last updated 2021-01-07
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BGP Working Group                                                 Y. Liu
Internet-Draft                                                   B. Song
Intended status: Standards Track                         ZTE Corporation
Expires: July 11, 2021                                   January 7, 2021

    BGP Extensions for Services in SRv6 and MPLS Coexisting Network
               draft-ls-bess-srv6-mpls-coexisting-vpn-01

Abstract

   This document proposes a method to achieve VPN/EVPN in a network
   where SRv6 and SR-MPLS/MPLS coexist, including extensions of BGP.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  the Co-existence Scenario . . . . . . . . . . . . . . . . . .   2
   3.  BGP extensions  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Extended SRv6 Service TLVs  . . . . . . . . . . . . . . .   4
     3.2.  Dual-Stack VPN Capability . . . . . . . . . . . . . . . .   6
   4.  Illustration  . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The incremental deployment of SRv6 into existing networks require
   SRv6 to interwork and co-exist with SR-MPLS/MPLS.

   Currently [I-D.agrawal-spring-srv6-mpls-interworking] and
   [I-D.pzm-bess-spring-interdomain-vpn] discuss about the SRv6 and MPLS
   interworking method.

   In the progress of upgrading some network, some of the legacy devices
   that support only MPLS/SR-MPLS will coexist with the new devices
   capable SRv6 for a long time.  The co-existence scenario also need to
   be further addressed.

   This document proposes a method to achieve VPN/EVPN in a network
   where SRv6 and SR-MPLS/MPLS coexist, including extensions of BGP.

2.  the Co-existence Scenario

                      +----R1----R2----+
                      |                | +----+CE21
                      |                | |
            CE1+----+PE1              PE2+
                      |                | |
                      |                | +----+CE22
                      +----R3----R4----+

                      Figure 1: Reference Topology 1

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                      +----R1----R2----+
                      |                |
            CE1+----+PE1               |
                                      PE2+----+CE2
            CE3+----+PE3               |
                      |                |
                      +----R3----R4----+

                      Figure 2: Reference Topology 2

   As shown in Figure 1 and Figure 2, R3 and R4 are capable of SRv6, R1
   and R2 are legacy devices which only support SR-MPLS/MPLS.

   In Figure 1, PE2 is connected to different services with different
   SLA requirements.  Different SLA requirements may correspond to
   different forwarding paths, these paths may be SRv6 capable, or may
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