Enhanced Route Refresh Capability for BGP-4

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Network Working Group                                          K. Patel
Internet Draft                                                  E. Chen
Intended Status: Standards Track                   B. Venkatachalapathy
Expiration Date: December 18, 2012                        Cisco Systems
                                                          June 17, 2012

              Enhanced Route Refresh Capability for BGP-4

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draft-ietf-idr-bgp-enhanced-route-refresh-02.txt                [Page 1]



   In this document we enhance the existing BGP route refresh mechanisms
   to provide for the demarcation of the beginning and the ending of a
   route refresh.  The enhancement can be used to facilitate on-line,
   non-disruptive consistency validations of BGP routing updates.

1. Introduction

   It is sometimes necessary to perform routing consistency validations
   such as checking for possible missing withdraws between BGP speakers
   [RFC4271].  Currently such validations typically involve off-line,
   manual operations which can be tedious and time consuming.

   In this document we enhance the existing BGP route refresh mechanisms
   [RFC2918] to provide for the demarcation of the beginning and the
   ending of a route refresh (which refers to the complete re-
   advertisement of the Adj-RIB-Out to a peer, subject to routing
   policies).  The enhancement can be used to facilitate on-line, non-
   disruptive consistency validation of BGP routing updates.

1.1. Specification of Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

2. Protocol Extensions

   The BGP protocol extensions introduced in this document include the
   definition of a new BGP capability, named "Enhanced Route Refresh
   Capability", and the specification of the message subtypes for the
   ROUTE-REFRESH message.

2.1. Enhanced Route Refresh Capability

   The "Enhanced Route Refresh Capability" is a new BGP capability
   [RFC5492].  The Capability Code for this capability is specified in
   the IANA Considerations section of this document. The Capability
   Length field of this capability is zero.

   By advertising this capability to a peer, a BGP speaker conveys to
   the peer that the speaker supports the message subtypes for the
   ROUTE-REFRESH message and the related procedures described in this

draft-ietf-idr-bgp-enhanced-route-refresh-02.txt                [Page 2]



2.2. Subtypes for ROUTE-REFRESH Message

   The "Reserved" field of the ROUTE-REFRESH message specified in
   [RFC2918] is re-defined as the "Message Subtype" with the following

          0 - Normal route refresh request [RFC2918]
              with/without ORF [RFC5291]
          1 - Demarcation of the beginning of a route refresh
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