TRILL Support of Point to Multipoint BFD
draft-ietf-trill-p2mp-bfd-00

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Document Type Active Internet-Draft (trill WG)
Last updated 2015-10-14 (latest revision 2015-06-09)
Replaces draft-zhang-trill-p2mp-bfd
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TRILL                                                           M. Zhang
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                           S. Pallagatti
Expires: December 11, 2015                              Juniper Networks
                                                             V. Govindan
                                                           Cisco Systems
                                                           June 09, 2015

                TRILL Support of Point to Multipoint BFD
                      draft-ietf-trill-p2mp-bfd-00

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 an RBridge Channel.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on December 11, 2015.

Copyright Notice

   Copyright (c) 2015 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Bootstrapping . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  A New RBridge Channel 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  . . . . . . . . . . . . . . . . . . . . . . .   6

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 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].  When the tail loses
   connectivity from the head, the tail should notify the head of the
   lack of multipoint connectivity with unicast BFD Control packets.
   These packets are transmitted using the existing RBridge Channel
   assigned to BFD Control [RFC7175].

2.  Acronyms and Terminology

2.1.  Acronyms

   Data Label: VLAN or Fine Grained Label [RFC7172].

   BFD: Bidirectional Forwarding Detection

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   P2MP: Point to Multi-Point

   TRILL: Transparent Interconnection of Lots of Links or Tunneled
   Routing in the Link Layer
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