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Revised Error Handling for BGP UPDATE Messages
draft-ietf-idr-error-handling-15

Internet Engineering Task Force                             E. Chen, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Updates: 1997, 4271, 4360, 4456, 4760,                   J. Scudder, Ed.
         5543, 5701, 6368 (if approved)                 Juniper Networks
Intended status: Standards Track                            P. Mohapatra
Expires: April 27, 2015                                 Sproute Networks
                                                                K. Patel
                                                     Cisco Systems, Inc.
                                                        October 24, 2014

             Revised Error Handling for BGP UPDATE Messages
                    draft-ietf-idr-error-handling-15

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 as 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 Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 27, 2015.

Chen, et al.             Expires April 27, 2015                 [Page 1]
Internet-Draft       Revised Error Handling for BGP         October 2014

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   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
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   Without obtaining an adequate license from the person(s) controlling
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   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

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

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