Bidirectional Forwarding Detection (BFD) on Multi-chassis Ling Aggregation Group (MC-LAG) Interfaces in IP Networks
draft-tanmir-rtgwg-bfd-mc-lag-ip-01

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RTG  Working Group                                             G. Mirsky
Internet-Draft                                                 ZTE Corp.
Updates: 7130 (if approved)                                  J. Tantsura
Intended status: Standards Track                               Indvidual
Expires: September 11, 2017                               March 10, 2017

     Bidirectional Forwarding Detection (BFD) on Multi-chassis Ling
          Aggregation Group (MC-LAG) Interfaces in IP Networks
                  draft-tanmir-rtgwg-bfd-mc-lag-ip-01

Abstract

   This document describes use of Bidirectional Forwarding Detection for
   Multi-chassis Link Aggregation Group to provide faster than Link
   Aggregation Control Protocol convergence.  This specification
   enhances and updates RFC 7130 "Bidirectional Forwarding Detection
   (BFD) on Link Aggregation Group (LAG) Interfaces".

Status of This Memo

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   This Internet-Draft will expire on September 11, 2017.

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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   2
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   2
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   2
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   3.  BFD on MC-LAG with IP only data plane . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   The [RFC7130] defines use of Bidirectional Forwarding Detection (BFD)
   on Link Aggregation Group (LAG) interfaces.  Multi-chassis LAG (MC-
   LAG) is type of LAG [IEEE.802.1AX.2008] with member links terminated
   on separate chassis.  [IEEE.802.1AX.2008] does not specify MC-LAG but
   doesn't preclude it either.  Link Aggregation Control Protocol
   (LACP), also defined in [IEEE.802.1AX.2008], can work with MC-LAG
   but, as in LAG case, can detect link failure only in range of single
   seconds.  This document defines how mechanism defined to work on LAG
   interfaces [RFC7130] can be adapted to MC-LAG case to enable sub-
   second detection of member link failure.

1.1.  Conventions used in this document

1.1.1.  Terminology

   BFD: Bidirectional Forwarding Detection

   LAG: Link Aggregation Group

   LACP: Link Aggregation Control Protocol

   MC-LAG: Multi-chassis Link Aggregation Group

1.1.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

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