Extensions to IS-IS for Layer-2 Systems
RFC 6165
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RFC - Proposed Standard
(April 2011; No errata)
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2015-10-14
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RFC 6165 (Proposed Standard)
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Stewart Bryant
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Internet Engineering Task Force (IETF) A. Banerjee
Request for Comments: 6165 Cisco Systems
Category: Standards Track D. Ward
ISSN: 2070-1721 Juniper Networks
April 2011
Extensions to IS-IS for Layer-2 Systems
Abstract
This document specifies the Intermediate System to Intermediate
System (IS-IS) extensions necessary to support link state routing for
any protocols running directly over Layer-2. While supporting this
concept involves several pieces, this document only describes
extensions to IS-IS. Furthermore, the Type, Length, Value pairs
(TLVs) described in this document are generic Layer-2 additions, and
specific ones as needed are defined in the IS-IS technology-specific
extensions. We leave it to the systems using these IS-IS extensions
to explain how the information carried in IS-IS is used.
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/rfc6165.
Banerjee & Ward Standards Track [Page 1]
RFC 6165 Layer-2-IS-IS April 2011
Copyright Notice
Copyright (c) 2011 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. Overview ........................................................2
1.1. Terminology ................................................3
2. TLV Enhancements to IS-IS .......................................3
2.1. Multi-Topology-Aware Port Capability TLV ...................3
2.2. The MAC-Reachability TLV ...................................4
3. Acknowledgements ................................................5
4. Security Considerations .........................................5
5. IANA Considerations .............................................5
6. References ......................................................6
6.1. Normative References .......................................6
6.2. Informative References .....................................6
1. Overview
There are a number of systems (for example, [RBRIDGES], [802.1aq],
and [OTV]) that use Layer-2 addresses carried in a link state routing
protocol, specifically Intermediate System to Intermediate System
[IS-IS] [RFC1195], to provide true Layer-2 routing. In almost all
the technologies mentioned above, classical Layer-2 packets are
encapsulated with an outer header. The outer header format varies
across all these technologies. This outer header is used to route
the encapsulated packets to their destination.
Each Intermediate System (IS) advertises one or more IS-IS Link State
Protocol Data Units (PDUs) with routing information. Each Link State
PDU (LSP) is composed of a fixed header and a number of tuples, each
consisting of a Type, a Length, and a Value. Such tuples are
Banerjee & Ward Standards Track [Page 2]
RFC 6165 Layer-2-IS-IS April 2011
commonly known as TLVs. In this document, we specify a set of TLVs
to be added to [IS-IS] PDUs, to support these proposed systems. The
TLVs are generic Layer-2 additions, and specific ones, as needed, are
defined in the IS-IS technology-specific extensions. This document
does not propose any new forwarding mechanisms using this additional
information carried within IS-IS.
1.1. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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