Transparent Interconnection of Lots of Links (TRILL): Multi-Topology
RFC 8377
Internet Engineering Task Force (IETF) D. Eastlake 3rd
Request for Comments: 8377 M. Zhang
Updates: 6325, 7177 Huawei
Category: Standards Track A. Banerjee
ISSN: 2070-1721 Cisco
July 2018
Transparent Interconnection of Lots of Links (TRILL):
Multi-Topology
Abstract
This document specifies extensions to the IETF TRILL (Transparent
Interconnection of Lots of Links) protocol to support multi-topology
routing of unicast and multi-destination traffic based on IS-IS
(Intermediate System to Intermediate System) multi-topology specified
in RFC 5120. This document updates RFCs 6325 and 7177.
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 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8377.
Copyright Notice
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document authors. All rights reserved.
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Eastlake, et al. Standards Track [Page 1]
RFC 8377 TRILL: Multi-Topology July 2018
Table of Contents
1. Introduction ....................................................2
1.1. Terminology ................................................4
2. Topologies ......................................................5
2.2. Links and Multi-Topology ...................................5
2.3. TRILL Switches and Multi-Topology ..........................6
2.4. TRILL Data Packets and Multi-Topology ......................6
2.4.1. Explicit Topology Labeling Support ..................7
2.4.2. The Explicit Topology Label .........................8
2.4.3. TRILL Use of the MT Label ...........................8
3. TRILL Multi-Topology Adjacency and Routing .....................10
3.1. Adjacency .................................................10
3.2. TRILL Switch Nicknames ....................................10
3.3. TRILL Unicast Routing .....................................11
3.4. TRILL Multi-Destination Routing ...........................11
3.4.1. Distribution Trees .................................11
3.4.2. Multi-Access Links .................................13
4. Mixed Links ....................................................13
5. Other Multi-Topology Considerations ............................14
5.1. Address Learning ..........................................14
5.1.1. Data Plane Learning ................................14
5.1.2. Multi-Topology ESADI ...............................14
5.2. Legacy Stubs ..............................................14
5.3. RBridge Channel Messages ..................................14
5.4. Implementations Considerations ............................15
6. Allocation Considerations ......................................15
6.1. IEEE Registration Authority Considerations ................15
6.2. IANA Considerations .......................................15
7. Security Considerations ........................................16
8. References .....................................................17
8.1. Normative References ......................................17
8.2. Informative References ....................................18
Appendix A. Differences from RFC 5120 .............................19
Acknowledgements ..................................................19
Authors' Addresses ................................................20
1. Introduction
This document specifies extensions to the IETF TRILL (Transparent
Interconnection of Lots of Links) protocol [RFC6325] [RFC7177]
[RFC7780] to support multi-topology routing for both unicast and
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