Revised Error Handling for BGP UPDATE Messages
RFC 7606

Document Type RFC - Proposed Standard (August 2015; No errata)
Last updated 2015-08-26
Replaces draft-ietf-idr-optional-transitive, draft-chen-ebgp-error-handling
Stream IETF
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Stream WG state Submitted to IESG for Publication
Consensus Yes
Document shepherd Rob Shakir
Shepherd write-up Show (last changed 2014-11-24)
IESG IESG state RFC 7606 (Proposed Standard)
Telechat date
Responsible AD Alvaro Retana
Send notices to idr-chairs@ietf.org, rob.shakir@bt.com
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                      E. Chen, Ed.
Request for Comments: 7606                           Cisco Systems, Inc.
Updates: 1997, 4271, 4360, 4456, 4760,                   J. Scudder, Ed.
         5543, 5701, 6368                               Juniper Networks
Category: Standards Track                                   P. Mohapatra
ISSN: 2070-1721                                         Sproute Networks
                                                                K. Patel
                                                     Cisco Systems, Inc.
                                                             August 2015

             Revised Error Handling for BGP UPDATE Messages

Abstract

   According to the base BGP specification, a BGP speaker that receives
   an UPDATE message containing a malformed attribute is required to
   reset the session over which the offending attribute was received.
   This behavior is undesirable because a session reset would impact not
   only routes with the offending attribute but also other valid routes
   exchanged over the session.  This document partially revises the
   error handling for UPDATE messages and provides guidelines for the
   authors of documents defining new attributes.  Finally, it revises
   the error handling procedures for a number of existing attributes.

   This document updates error handling for RFCs 1997, 4271, 4360, 4456,
   4760, 5543, 5701, and 6368.

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/rfc7606.

Chen, et al.                 Standards Track                    [Page 1]
RFC 7606             Revised Error Handling for BGP          August 2015

Copyright Notice

   Copyright (c) 2015 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Chen, et al.                 Standards Track                    [Page 2]
RFC 7606             Revised Error Handling for BGP          August 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Error-Handling Approaches . . . . . . . . . . . . . . . . . .   5
   3.  Revision to BGP UPDATE Message Error Handling . . . . . . . .   5
   4.  Attribute Length Fields . . . . . . . . . . . . . . . . . . .   7
   5.  Parsing of Network Layer Reachability Information (NLRI)
       Fields  . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Encoding NLRI . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Missing NLRI  . . . . . . . . . . . . . . . . . . . . . .   8
     5.3.  Syntactic Correctness of NLRI Fields  . . . . . . . . . .   9
     5.4.  Typed NLRI  . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Operational Considerations  . . . . . . . . . . . . . . . . .  10
   7.  Error-Handling Procedures for Existing Attributes . . . . . .  11
     7.1.  ORIGIN  . . . . . . . . . . . . . . . . . . . . . . . . .  11
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