I-D ACTION:draft-ietf-idr-route-damp-03.txt,.ps

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This draft is a work item of the Inter-Domain Routing Working Group of the IETF.

	Title		: BGP Route Flap Damping
	Author(s)	: C. Villamizar, R. Govindan, R. Chandra
	Filename	: draft-ietf-idr-route-damp-03.txt,.ps
	Pages		: 33
	Date		: 15-May-98
	
  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
 
     o  minimal addition space and computational overhead
  
  An excessive rate of update to the advertised reachability of a subset
  of Internet prefixes has been widespread in the Internet.  This
  observation was made in the early 1990s by many people involved in
  Internet operations and remains the case.  These excessive updates are
  not necessarily periodic so route oscillation would be a misleading
  term.  The informal term used to describe this effect is ``route
  flap''.  The techniques described here are now widely deployed and are
  commonly referred to as ``route flap damping''.

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