Bidirectional Forwarding Detection (BFD) on Multi-chassis Link Aggregation Group (MC-LAG) Interfaces
draft-mtm-rtgwg-bfd-mc-lag-01

Document Type Active Internet-Draft (individual)
Authors Greg Mirsky  , Jeff Tantsura  , Gyan Mishra 
Last updated 2020-11-19
Replaces draft-tanmir-rtgwg-bfd-mc-lag-mpls, draft-tanmir-rtgwg-bfd-mc-lag-ip
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RTG Working Group                                              G. Mirsky
Internet-Draft                                                 ZTE Corp.
Intended status: Standards Track                             J. Tantsura
Expires: May 22, 2021                                             Apstra
                                                               G. Mishra
                                                            Verizon Inc.
                                                       November 18, 2020

     Bidirectional Forwarding Detection (BFD) on Multi-chassis Link
                 Aggregation Group (MC-LAG) Interfaces
                     draft-mtm-rtgwg-bfd-mc-lag-01

Abstract

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

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 22, 2021.

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   Copyright (c) 2020 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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   carefully, as they describe your rights and restrictions with respect

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   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   2
       1.1.1.  Acronyms  . . . . . . . . . . . . . . . . . . . . . .   2
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   3.  BFD on MC-LAG with IP-only Data Plane . . . . . . . . . . . .   3
   4.  BFD on MC-LAG with IP/MPLS Data Plane . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     8.2.  Informative . . . . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The [RFC7130] defines the use of Bidirectional Forwarding Detection
   (BFD) on Link Aggregation Group (LAG) interfaces.  A multi-chassis
   LAG (MC-LAG) is a 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 the LAG case, the fastest link failure detection
   interval is only in a range of single-digit seconds.  This document
   defines how the mechanism defined to work on LAG interfaces [RFC7130]
   can be adapted to the MC-LAG case to enable sub-second detection of
   member link failure.

1.1.  Conventions used in this document

1.1.1.  Acronyms

   BFD: Bidirectional Forwarding Detection

   LAG: Link Aggregation Group

   LACP: Link Aggregation Control Protocol

   MC-LAG: Multi-chassis Link Aggregation Group

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   MPLS: Multi-Protocol Label Switching

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 BCP
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