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 2012Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Fedyk, et al. Standards Track [Page 2]RFC 6329 IS-IS Support of IEEE 802.1aq April 2012Table 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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