Transparent Interconnection of Lots of Links (TRILL): Interface Addresses APPsub-TLV
RFC 7961
Internet Engineering Task Force (IETF) D. Eastlake 3rd
Request for Comments: 7961 Y. Li
Category: Standards Track Huawei
ISSN: 2070-1721 August 2016
Transparent Interconnection of Lots of Links (TRILL):
Interface Addresses APPsub-TLV
Abstract
This document specifies a TRILL (Transparent Interconnection of Lots
of Links) IS-IS application sub-TLV that enables the reporting by a
TRILL switch of sets of addresses. Each set of addresses reports all
of the addresses that designate the same interface (port) and also
reports the TRILL switch by which that interface is reachable. For
example, a 48-bit MAC (Media Access Control) address, IPv4 address,
and IPv6 address can be reported as all corresponding to the same
interface reachable by a particular TRILL switch. Such information
could be used in some cases to synthesize responses to, or bypass the
need for, the Address Resolution Protocol (ARP), the IPv6 Neighbor
Discovery (ND) protocol, or the flooding of unknown MAC addresses.
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
http://www.rfc-editor.org/info/rfc7961.
Eastlake & Li Standards Track [Page 1]
RFC 7961 TRILL: IA APPsub-TLV August 2016
Copyright Notice
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Table of Contents
1. Introduction ....................................................3
1.1. Conventions Used in This Document ..........................3
2. Format of the Interface Addresses APPsub-TLV ....................4
3. IA APPsub-TLV Sub-sub-TLVs ......................................9
3.1. AFN Size Sub-sub-TLV ......................................10
3.2. Fixed Address Sub-sub-TLV .................................11
3.3. Data Label Sub-sub-TLV ....................................12
3.4. Topology Sub-sub-TLV ......................................12
4. Security Considerations ........................................13
5. IANA Considerations ............................................14
5.1. Allocation of AFN Values ..................................14
5.2. IA APPsub-TLV Sub-sub-TLVs Sub-registry ...................15
5.3. IA APPsub-TLV Number ......................................16
6. Additional AFN Information .....................................16
7. Processing Address Sets ........................................16
8. References .....................................................18
8.1. Normative References ......................................18
8.2. Informative References ....................................20
Appendix A. Examples ..............................................21
A.1. Simple Example ............................................21
A.2. Complex Example ...........................................22
Acknowledgments ...................................................24
Authors' Addresses ................................................24
Eastlake & Li Standards Track [Page 2]
RFC 7961 TRILL: IA APPsub-TLV August 2016
1. Introduction
This document specifies a TRILL (Transparent Interconnection of Lots
of Links) [RFC6325] IS-IS application sub-TLV (APPsub-TLV) [RFC6823]
that enables the convenient representation of sets of addresses where
all of the addresses in each set designate the same interface (port).
For example, a 48-bit MAC (Media Access Control) [RFC7042] address,
IPv4 address, and IPv6 address can be reported as all three
designating the same interface. In addition, a Data Label (VLAN or
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