Transparent Interconnection of Lots of Links (TRILL): Bidirectional Forwarding Detection (BFD) Support
RFC 7175

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Internet Engineering Task Force (IETF)                         V. Manral
Request for Comments: 7175                                   Ionos Corp.
Category: Standards Track                                D. Eastlake 3rd
ISSN: 2070-1721                                           Huawei R&D USA
                                                                 D. Ward
                                                           Cisco Systems
                                                             A. Banerjee
                                                        Cumulus Networks
                                                                May 2014

         Transparent Interconnection of Lots of Links (TRILL):
            Bidirectional Forwarding Detection (BFD) Support

Abstract

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

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

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7175.

Manral, et al.               Standards Track                    [Page 1]
RFC 7175                    TRILL BFD Support                   May 2014

Copyright Notice

   Copyright (c) 2014 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.

Table of Contents

   1. Introduction ....................................................2
      1.1. Terminology ................................................3
   2. BFD over TRILL ..................................................3
      2.1. Sessions and Initialization ................................4
   3. TRILL BFD Control Protocol ......................................5
      3.1. One-Hop TRILL BFD Control ..................................5
      3.2. BFD Control Frame Processing ...............................5
   4. TRILL BFD Echo Protocol .........................................6
      4.1. BFD Echo Frame Processing ..................................6
   5. Management and Operations Considerations ........................7
   6. Default Authentication ..........................................7
   7. Security Considerations .........................................8
   8. IANA Considerations .............................................9
   9. Acknowledgements ................................................9
   10. References .....................................................9
      10.1. Normative References ......................................9
      10.2. Informative References ...................................10

1. Introduction

   Faster convergence is a critical feature of Transparent
   Interconnection of Lots of Links (TRILL) [RFC6325] networks.  The
   TRILL IS-IS Hellos [RFC7177] [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.

Manral, et al.               Standards Track                    [Page 2]
RFC 7175                    TRILL BFD Support                   May 2014

   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
   there is a failure between two bridges that are in turn between two