Purge Originator Identification TLV for IS-IS
RFC 6232

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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 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. 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 2011

2.  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

   This document defines a TLV to be included in purges.  If an IS
   generates a purge, it SHOULD include this TLV in the purge with its
   own system ID.  If an IS receives a purge that does not include this
   TLV, then it SHOULD add this TLV with both its own system ID and the
   system ID of the IS from which it received the purge.  This allows