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A BGP Inter-AS Cost Attribute

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Iljitsch van Beijnum , Rolf Winter
Last updated 2009-03-09
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Although BGP implementations have extensive path selection algorithms, in practice operators have trouble performing satisfactory traffic engineering of incoming traffic based on BGP attributes that are taken into account in the path selection algorithm alone. For this reason, many ASes deaggregate their address range(s) into smaller blocks and announce these blocks differently to different neighboring ASes in order to arrive at the desired traffic flow. This practice contributes to the growth of the global routing table, which drives up capital expenditures for networks engaging in inter-domain routing. This memo introduces a new inter-domain metric that supports finer-grained traffic engineering than current BGP attributes.


Iljitsch van Beijnum
Rolf Winter

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)