A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : The Accumulated IGP Metric Attribute for BGP
Author(s) : R. Fernando, et al.
Filename : draft-rosen-idr-aigp-00.txt
Pages : 13
Date : 2009-02-09
Routing protocols that have been designed to run within a single
administrative domain ("IGPs") generally do so by assigning a metric
to each link, and then choosing as the installed path between two
nodes the path for which the total distance (sum of the metric of
each link along the path) is minimized. BGP, designed to provide
routing over a large number of independent administrative domains
("autonomous systems"), does not make its path selection decisions
through the use of a metric. It is generally recognized that any
attempt to do so would incur significant scalability problems, as
well as inter-administration coordination problems. However, there
are deployments in which a single administration runs several
contiguous BGP networks. In such cases, it can be desirable, within
that single administrative domain, for BGP to select paths based on a
metric, just as an IGP would do. The purpose of this document is to
provide a specification for doing so.
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