L3DL based PE-CE Control Plane for EVPN
draft-malhotra-bess-evpn-l3dl-00

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Last updated 2019-07-02
Replaces draft-malhotra-bess-evpn-lsoe
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INTERNET-DRAFT                                          N. Malhotra, Ed.
                                                                K. Patel
                                                                  Arrcus
Intended Status: Proposed Standard                                      
                                                              J. Rabadan
                                                                   Nokia

Expires: Jan 3, 2020                                        July 2, 2019

                L3DL based PE-CE Control Plane for EVPN
                    draft-malhotra-bess-evpn-l3dl-00

Abstract

   In an EVPN network, EVPN PEs provide VPN bridging and routing service
   to connected CE devices based on BGP EVPN control plane. At present,
   there is no PE-CE control plane defined for an EVPN PE to learn CE
   MAC, IP, and any other routes from a CE that may be distributed in
   EVPN control plane to enable unicast flows between CE devices. As a
   result, EVPN PEs rely on data plane based gleaning of source MACs for
   CE MAC learning, ARP/ND snooping for CE IPv4/IPv6 learning, and in
   some cases, local configuration for learning prefix routes behind a
   CE. A PE-CE control plane alternative to this traditional learning
   approach, where applicable, offers certain distinct advantages that
   in turn result in simplified EVPN operation. 

   This document defines a PE-CE control plane as an optional
   alternative to traditional non-control-plane based PE-CE learning in
   an EVPN network. It defines PE-CE control plane procedures and TLVs
   based on L3DL as the base protocol, enumerates advantages that may be
   achieved by using this PE-CE control plane, and discusses in detail
   EVPN use cases that are simplified as a result.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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malhotra et al.            Expires Jan 3 2020                   [Page 1]
INTERNET DRAFT  L3DL based PE-CE Control Plane for EVPN                 

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Copyright and License Notice

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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  5
   2. PE <-> CE Control Plane Overview  . . . . . . . . . . . . . . .  7
   3. TLVs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1 Overlay IPv4 Encapsulation PDU . . . . . . . . . . . . . . .  9
     3.2 Overlay IPv6 Encapsulation PDU . . . . . . . . . . . . . . . 10
     3.3 Overlay IPv4 Prefix Encapsulation PDU  . . . . . . . . . . . 12
     3.4 Overlay IPv6 Prefix Encapsulation PDU  . . . . . . . . . . . 13
   4. CE MAC/IP Learning on a PE AC . . . . . . . . . . . . . . . . . 14
     4.1 PE <-> CE L3DL Session Establishment . . . . . . . . . . . . 14
     4.2 CE MAC/IP Learning . . . . . . . . . . . . . . . . . . . . . 14
   5. PE Any-cast GW MAC/IP Learning on CE  . . . . . . . . . . . . . 14
   6. Remote CE MAC/IP Learning on CE . . . . . . . . . . . . . . . . 15
   7. PE <-> CE Control Plane with EVPN All-active Multi-Homing . . . 16
     7.1 All-active Multi-Homing Mode . . . . . . . . . . . . . . . . 16
     7.2 Source MAC . . . . . . . . . . . . . . . . . . . . . . . . . 17
     7.3 CE MAC/IP Learning with EVPN All-active Multi-Homing . . . . 17
     7.4 LAG Member Link Failure  . . . . . . . . . . . . . . . . . . 18
       7.4.1 Session Re-establishment . . . . . . . . . . . . . . . . 18
       7.4.2 TLV Retention  . . . . . . . . . . . . . . . . . . . . . 18
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