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IS-IS Extensions Supporting IEEE 802.1aq Shortest Path Bridging
RFC 6329

Internet Engineering Task Force (IETF)                     D. Fedyk, Ed.
Request for Comments: 6329                                Alcatel-Lucent
Category: Standards Track                          P. Ashwood-Smith, Ed.
ISSN: 2070-1721                                                   Huawei
                                                                D. Allan
                                                                Ericsson
                                                                N. Bragg
                                                           Ciena Limited
                                                            P. Unbehagen
                                                                   Avaya
                                                              April 2012

    IS-IS Extensions Supporting IEEE 802.1aq Shortest Path Bridging

Abstract

   802.1aq Shortest Path Bridging (SPB) has been standardized by the
   IEEE as the next step in the evolution of the various spanning tree
   and registration protocols.  802.1aq allows for true shortest path
   forwarding in a mesh Ethernet network context utilizing multiple
   equal cost paths.  This permits it to support much larger Layer 2
   topologies, with faster convergence, and vastly improved use of the
   mesh topology.  Combined with this is single point provisioning for
   logical connectivity membership, which includes point-to-point,
   point-to-multipoint, and multipoint-to-multipoint variations.  This
   memo documents the IS-IS changes required to support this IEEE
   protocol and provides some context and examples.

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/rfc6329.

Fedyk, et al.                Standards Track                    [Page 1]
RFC 6329              IS-IS Support of IEEE 802.1aq           April 2012

Copyright Notice

   Copyright (c) 2012 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.

Fedyk, et al.                Standards Track                    [Page 2]
RFC 6329              IS-IS Support of IEEE 802.1aq           April 2012

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................4
   3. Conventions Used in This Document ...............................5
   4. 802.1aq Overview ................................................6
      4.1. Multi-Topology Support .....................................8
      4.2. Data Path SPBM - Unicast ...................................8
      4.3. Data Path SPBM - Multicast (Head-End Replication) ..........9
      4.4. Data Path SPBM - Multicast (Tandem Replication) ............9
      4.5. Data Path SPBV Broadcast ..................................11
      4.6. Data Path SPBV Unicast ....................................11
      4.7. Data Path SPBV Multicast ..................................12
   5. SPBM Example ...................................................12
   6. SPBV Example ...................................................14
   7. SPB Supported Adjacency types ..................................16
   8. SPB IS-IS Adjacency Addressing .................................16
   9. IS-IS Area Address and SYSID ...................................17
   10. Level 1/2 Adjacency ...........................................17
   11. Shortest Path Default Tie-Breaking ............................17
   12. Shortest Path ECT .............................................18
   13. Hello (IIH) Protocol Extensions ...............................19
      13.1. SPB-MCID Sub-TLV .........................................20
      13.2. SPB-Digest Sub-TLV .......................................21

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