RFC 2439 (rfc2439) - Page 1 of 37

BGP Route Flap Damping

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Network Working Group                                       C. Villamizar
Request for Comments: 2439                                            ANS
Category: Standards Track                                      R. Chandra
                                                                    Cisco
                                                              R. Govindan
                                                                      ISI
                                                            November 1998


                         BGP Route Flap Damping

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 (1998).  All Rights Reserved.

Abstract

   A usage of the BGP routing protocol is described which is capable of
   reducing the routing traffic passed on to routing peers and therefore
   the load on these peers without adversely affecting route convergence
   time for relatively stable routes.  This technique has been
   implemented in commercial products supporting BGP. The technique is
   also applicable to IDRP.

   The overall goals are:

   o  to provide a mechanism capable of reducing router processing load
      caused by instability

   o  in doing so prevent sustained routing oscillations

   o  to do so without sacrificing route convergence time for generally
      well behaved routes.

   This must be accomplished keeping other goals of BGP in mind:

   o  pack changes into a small number of updates

   o  preserve consistent routing




Villamizar, et. al.         Standards Track
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