RFC 3392 (rfc3392) - Page 1 of 6

Capabilities Advertisement with BGP-4

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Network Working Group                                         R. Chandra
Request for Comments: 3392                              Redback Networks
Obsoletes: 2842                                               J. Scudder
Category: Standards Track                                  Cisco Systems
                                                           November 2002


                 Capabilities Advertisement with BGP-4

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This document defines a new Optional Parameter, called Capabilities,
   that is expected to facilitate the introduction of new capabilities
   in the Border Gateway Protocol (BGP) by providing graceful capability
   advertisement without requiring that BGP peering be terminated.

   This document obsoletes RFC 2842.

1. Introduction

   Currently BGP-4 requires that when a BGP speaker receives an OPEN
   message with one or more unrecognized Optional Parameters, the
   speaker must terminate BGP peering.  This complicates introduction of
   new capabilities in BGP.

2. Specification of Requirements

   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 RFC 2119 [RFC 2119].









Chandra, et. al.            Standards Track
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