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TRILL (Transparent Interconnetion of Lots of Links): Bidirectional Forwarding Detection (BFD) Support
draft-ietf-trill-rbridge-bfd-07

TRILL Working Group                                            V. Manral
INTERNET-DRAFT                                       Hewlett Packard Co.
Intended status: Proposed Standard                           D. Eastlake
                                                          Huawei R&D USA
                                                                 D. Ward
                                                           Cisco Systems
                                                             A. Banerjee
                                                        Cumulus Networks
Expires: January 15, 2013                                  July 16, 2012

          TRILL (Transparent Interconnetion of Lots of Links):
            Bidirectional Forwarding Detection (BFD) Support
                 <draft-ietf-trill-rbridge-bfd-07.txt>

Abstract

   This document specifies use of the BFD (Bidirectional Forwarding
   Detection) protocol in RBridge campuses based on the Rbridge Channel
   extension to the the TRILL (TRansparent Interconnection of Lots of
   Links) protocol.

   BFD is a widely deployed OAM (Operations, Administration, and
   Maintenance) mechanism in IP and MPLS (Multi Protocol Label
   Switching) networks, using UDP and ACH (Associated Channel Header)
   encapsulation respectively.  This document specifies the BFD
   encapsulation over TRILL.

Status of This Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.  Distribution of this document is
   unlimited. Comments should be sent to the TRILL working group mailing
   list: <rbridge@postel.org>.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   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."

V. Manral, et al                                                [Page 1]
INTERNET-DRAFT                                   BFD TRILL Encapsulation

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/1id-abstracts.html. The list of Internet-Draft
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V. Manral, et al                                                [Page 2]
INTERNET-DRAFT                                   BFD TRILL Encapsulation

Table of Contents

      1. Introduction............................................4
      1.1 Terminology............................................4

      2.  BFD over TRILL.........................................6
      2.1 Sessions and Initialization............................6

      3. TRILL BFD Control Protocol..............................8
      3.1 One-Hop TRILL BFD Control..............................8
      3.2 BFD Control Frame Processing...........................8

      4. TRILL BFD Echo Protocol.................................9
      4.1  BFD Echo Frame Processing.............................9

      5. Management and Operations Considerations...............11
      6. Default Authentication.................................12
      7. Security Considerations................................14
      8. IANA Considerations....................................15
      9. Acknowledgements.......................................15
      Normative References......................................16
      Informative References....................................16
      Recent Changes Record.....................................18

V. Manral, et al                                                [Page 3]
INTERNET-DRAFT                                   BFD TRILL Encapsulation

1. Introduction

   Faster convergence is a critical feature of TRILL (Transparent
   Interconnection of Lots of Links [RFC6325]) networks.  The TRILL IS-
   IS Hellos [RFC6327] [IS-IS] used between RBridges provide a basic
   neighbor and continuity check for TRILL links.  However, failure
   detection by non- receipt of such Hellos is based on the holding time
   parameter that is commonly set to a value of tens of seconds and, in
   any case, has a minimum expressible value of one second.

   Some applications, including voice over IP, may wish, with high
   probability, to detect interruptions in continuity within a much
   shorter time period.  In some cases physical layer failures can be
   detected very rapidly but this is not always possible, such as when

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