IS-IS Registry Extension for Purges
RFC 6233
Document | Type | RFC - Proposed Standard (May 2011; No errata) | |
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Authors | Tony Li , Les Ginsberg | ||
Last updated | 2015-10-14 | ||
Stream | Internet Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6233 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Stewart Bryant | ||
IESG note | David Ward (dward@juniper.net) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) T. Li Request for Comments: 6233 L. Ginsberg Updates: 3563, 5304, 5310 Cisco Systems, Inc. Category: Standards Track May 2011 ISSN: 2070-1721 IS-IS Registry Extension for Purges Abstract IANA maintains the "IS-IS TLV Codepoints" registry. This registry documents which TLVs can appear in different types of IS-IS Protocol Data Units (PDUs), but does not document which TLVs can be found in zero Remaining Lifetime Link State PDUs (LSPs), a.k.a. purges. This document extends the existing registry to record the set of TLVs that are permissible in purges and updates the rules for generating and processing purges in the presence of authentication. This document updates RFC 3563, RFC 5304, and RFC 5310. 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/rfc6233. 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. Li & Ginsberg Standards Track [Page 1] RFC 6233 Registry Extension for Purges May 2011 Table of Contents 1. Introduction ....................................................2 1.1. Requirements Language ......................................2 2. Registry Changes ................................................2 3. Purges and Authentication .......................................3 4. IANA Considerations .............................................3 5. Security Considerations .........................................3 6. Normative References ............................................4 1. Introduction The IS-IS [ISO-10589] routing protocol maintains a link state database of the topology of its routing domain by flooding a set of Link State Protocol Data Units (LSPs). When the protocol no longer needs the information stored in an LSP, it uses the purge mechanism to cause the Intermediate Systems (ISs) in its domain to discard the information contained in the LSP. The process for generating purges can be found in Section 7.3.16.4 of [ISO-10589]. This process retains only the LSP header, discarding any TLVs that had been carried within the LSP. Subsequent enhancements to IS-IS, such as [RFC5304] [RFC5310], amend the process of generating a purge and allow the inclusion of certain TLVs in purges. 1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Registry Changes This document extends the current "IS-IS TLV Codepoints" registry, defined in [RFC3563], to record the set of TLVs that MAY be found in purges. All other TLVs MUST NOT appear in purges. This will serve as an aid to subsequent documents, which can then refer to the registry as the definitive list of the TLVs allowed in purges. This will also act as an aid to implementers, providing them with an easily accessible compendium of allowable TLVs. The purge status defined for a given TLV applies to all sub-TLVs defined for that TLV. Li & Ginsberg Standards Track [Page 2] RFC 6233 Registry Extension for Purges May 2011 3. Purges and Authentication Previous documents on authentication [RFC5304] [RFC5310] required that an IS only accept a purge if it only contained the Authentication TLV. This document updates and generalizes that behavior as follows: an implementation that implements authentication MUST NOT accept a purge that contains any TLV listed in the registry that is not acceptableShow full document text