Internet Engineering Task Force (IETF) F. Wei
Request for Comments: 6232 Y. Qin
Updates: 5301, 5304, 5310 Z. Li
Category: Standards Track China Mobile
ISSN: 2070-1721 T. Li
Cisco Systems, Inc.
J. Dong
Huawei Technologies
May 2011
Purge Originator Identification TLV for IS-IS
Abstract
At present, an IS-IS purge does not contain any information
identifying the Intermediate System (IS) that generates the purge.
This makes it difficult to locate the source IS.
To address this issue, this document defines a TLV to be added to
purges to record the system ID of the IS generating it. Since normal
Link State Protocol Data Unit (LSP) flooding does not change LSP
contents, this TLV should propagate with the purge.
This document updates RFC 5301, 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/rfc6232.
Wei, et al. Standards Track [Page 1]RFC 6232 Purge Originator Identification TLV May 2011Copyright 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
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Table of Contents
1. Introduction ....................................................2
2. Requirements Language ...........................................3
3. The Purge Originator Identification (POI) TLV ...................3
4. Using the Dynamic Hostname TLV in Purges ........................3
5. Security Considerations .........................................4
6. IANA Considerations .............................................4
7. Acknowledgments .................................................4
8. Normative References ............................................4
1. Introduction
The IS-IS [ISO-10589] routing protocol has been widely used in large-
scale IP networks because of its strong scalability and fast
convergence.
The IS-IS protocol floods purges throughout an area, regardless of
which IS initiated the purge. If a network operator would like to
investigate the cause of the purge, it is difficult to determine the
origin of the purge. At present, the IS-IS protocol has no mechanism
to locate the originator of a purge. To address this problem, this
document defines a TLV to be added to purges to record the system ID
of the IS generating the purge.
Field experience has shown several circumstances where an IS can
improperly generate a purge. These are all due to implementation
deficiencies or implementations that predate [ISO-TC1] and generate a
purge when they receive a corrupted Link State Protocol Data Unit
(LSP).
Wei, et al. Standards Track [Page 2]RFC 6232 Purge Originator Identification TLV May 20112. 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].
3. The Purge Originator Identification (POI) TLV
datatracker.ietf.org