TRILL Support of Point to Multipoint BFD
draft-ietf-trill-p2mp-bfd-05

Document Type Active Internet-Draft (trill WG)
Last updated 2017-05-07
Replaces draft-zhang-trill-p2mp-bfd
Stream IETF
Intended RFC status Proposed Standard
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TRILL                                                           M. Zhang
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                           S. Pallagatti
Updates: 7175, 7177                                                     
                                                             V. Govindan
                                                           Cisco Systems
Expires: November 9, 2017                                    May 8, 2017

                TRILL Support of Point to Multipoint BFD
                      draft-ietf-trill-p2mp-bfd-05

Abstract

   Point to multipoint (P2MP) BFD is designed to verify multipoint
   connectivity.  This document specifies the support of P2MP BFD in
   TRILL.  Similar to TRILL point-to-point BFD, BFD Control packets in
   TRILL P2MP BFD are transmitted using RBridge Channel message. This
   document updates RFC 7175 and RFC 7177.

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 http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 December 11, 2015.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://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
 

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   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 . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Acronyms and Terminology . . . . . . . . . . . . . . . . . . .  2
     2.1.  Acronyms . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Bootstrapping  . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  A New RBridge Channel Message for P2MP BFD . . . . . . . . . .  3
   5.  Discriminators and Packet Demultiplexing . . . . . . . . . . .  4
   6.  Tracking Active Tails  . . . . . . . . . . . . . . . . . . . .  4
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  4
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  5
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  5
   10.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  5
     10.1.  Normative References  . . . . . . . . . . . . . . . . . .  5
     10.2.  Informative References  . . . . . . . . . . . . . . . . .  6
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  7

1.  Introduction

   TRILL supports multicast forwarding.  Applications based on TRILL
   multicast may need quick detection of multicast failures using P2MP
   BFD.  This document specifies TRILL support of P2MP BFD.

   To use P2MP BFD, the head end needs to periodically transmit BFD
   Control packets to all tails using TRILL multicast.  A new RBridge
   Channel message is allocated for this purpose.

   In order to execute the global protection of distribution used for
   multicast forwarding [I-D.ietf-trill-resilient-trees], the head needs
   to track the active status of tails
   [I-D.ietf-bfd-multipoint-active-tail].  If the tail loses
   connectivity as detected by not receiving the new RBridge Channel
   message from the head, the tail should notify the head of the lack of
   multipoint connectivity with unicast BFD Control packets.  These
   unicast BFD Control packets are transmitted using the existing
   RBridge Channel message assigned to BFD Control [RFC7175].

   This document updates [RFC7177] as specified in Section 3 and updates
   [RFC7175] as specified in Section 4.

2.  Acronyms and Terminology
 

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