Multicast VPN Fast Upstream Failover
draft-ietf-bess-mvpn-fast-failover-15

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Network Working Group                                      T. Morin, Ed.
Internet-Draft                                                    Orange
Intended status: Standards Track                          R. Kebler, Ed.
Expires: July 25, 2021                                  Juniper Networks
                                                          G. Mirsky, Ed.
                                                               ZTE Corp.
                                                        January 21, 2021

                  Multicast VPN Fast Upstream Failover
                 draft-ietf-bess-mvpn-fast-failover-15

Abstract

   This document defines Multicast Virtual Private Network (VPN)
   extensions and procedures that allow fast failover for upstream
   failures by allowing downstream Provider Edges (PEs) to consider the
   status of Provider-Tunnels (P-tunnels) when selecting the Upstream PE
   for a VPN multicast flow.  The fast failover is enabled by using RFC
   8562 Bidirectional Forwarding Detection (BFD) for Multipoint Networks
   and the new BGP Attribute - BFD Discriminator.  Also, the document
   introduces a new BGP Community, Standby PE, extending BGP Multicast
   VPN routing so that a C-multicast route can be advertised toward a
   Standby Upstream PE.

Status of This Memo

   This Internet-Draft is submitted 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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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   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 July 25, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Morin, et al.             Expires July 25, 2021                 [Page 1]
Internet-Draft         MVPN Fast Upstream Failover          January 2021

   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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions used in this document . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  UMH Selection Based on Tunnel Status  . . . . . . . . . . . .   5
     3.1.  Determining the Status of a Tunnel  . . . . . . . . . . .   6
       3.1.1.  MVPN Tunnel Root Tracking . . . . . . . . . . . . . .   7
       3.1.2.  PE-P Upstream Link Status . . . . . . . . . . . . . .   7
       3.1.3.  P2MP RSVP-TE Tunnels  . . . . . . . . . . . . . . . .   7
       3.1.4.  Leaf-initiated P-tunnels  . . . . . . . . . . . . . .   8
       3.1.5.  (C-S, C-G) Counter Information  . . . . . . . . . . .   8
       3.1.6.  BFD Discriminator Attribute . . . . . . . . . . . . .   9
       3.1.7.  Per PE-CE Link BFD Discriminator  . . . . . . . . . .  13
       3.1.8.  Operational Considerations for Monitoring P-Tunnel's
               Status  . . . . . . . . . . . . . . . . . . . . . . .  13
   4.  Standby C-multicast Route . . . . . . . . . . . . . . . . . .  14
     4.1.  Downstream PE Behavior  . . . . . . . . . . . . . . . . .  15
     4.2.  Upstream PE Behavior  . . . . . . . . . . . . . . . . . .  16
     4.3.  Reachability Determination  . . . . . . . . . . . . . . .  17
     4.4.  Inter-AS  . . . . . . . . . . . . . . . . . . . . . . . .  18
       4.4.1.  Inter-AS Procedures for downstream PEs, ASBR Fast
               Failover  . . . . . . . . . . . . . . . . . . . . . .  18
       4.4.2.  Inter-AS Procedures for ASBRs . . . . . . . . . . . .  19
   5.  Hot Root Standby  . . . . . . . . . . . . . . . . . . . . . .  19
   6.  Duplicate Packets . . . . . . . . . . . . . . . . . . . . . .  20
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
     7.1.  Standby PE Community  . . . . . . . . . . . . . . . . . .  20
     7.2.  BFD Discriminator . . . . . . . . . . . . . . . . . . . .  20
     7.3.  BFD Discriminator Optional TLV Type . . . . . . . . . . .  21