Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces
draft-ietf-bfd-on-lags-00

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Last updated 2013-05-10
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Network Working Group                                     M. Bhatia, Ed.
Internet-Draft                                            Alcatel-Lucent
Intended status: Standards Track                            M. Chen, Ed.
Expires: November 11, 2013                           Huawei Technologies
                                                         S. Boutros, Ed.
                                                    M. Binderberger, Ed.
                                                           Cisco Systems
                                                            J. Haas, Ed.
                                                        Juniper Networks
                                                            May 10, 2013

Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG)
                               Interfaces
                       draft-ietf-bfd-on-lags-00

Abstract

   This document proposes a mechanism to run BFD on Link Aggregation
   Group (LAG) interfaces.  It does so by running an independent
   Asynchronous mode BFD session on every LAG member link.

   This mechanism allows the verification of member link continuity,
   either in combination with, or in absence of, LACP.  It provides a
   shorter detection time than what LACP offers.  The continuity check
   can also cover elements of layer 3 bidirectional forwarding.

   This mechanism utilizes a well-known UDP port distinct from that of
   single-hop BFD over IP.  This new UDP port removes the ambiguity of
   BFD over LAG packets from BFD over single-hop IP.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months

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   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 November 11, 2013.

Copyright Notice

   Copyright (c) 2013 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
   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.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  BFD on LAG member links  . . . . . . . . . . . . . . . . . . .  4
     2.1.  Micro BFD session address family . . . . . . . . . . . . .  5
     2.2.  Micro BFD session negotiation  . . . . . . . . . . . . . .  5
     2.3.  Micro BFD session Ethernet details . . . . . . . . . . . .  6
   3.  LAG Management Module  . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Interaction between LAG and BFD  . . . . . . . . . . . . .  6
     3.2.  Handling Exceptions  . . . . . . . . . . . . . . . . . . .  7
   4.  BFD on LAG members and layer-3 applications  . . . . . . . . .  8
   5.  Detecting a member link failure  . . . . . . . . . . . . . . .  8
   6.  Security Consideration . . . . . . . . . . . . . . . . . . . .  8
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   9.  Contributing authors . . . . . . . . . . . . . . . . . . . . .  9
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 10
     10.2. Informative References . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10

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