A New Internet-Draft is available from the on-line Internet-Drafts
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Title : Context updates in BGP
Author(s) : M. Djernaes, et al.
Filename : draft-djernaes-simple-context-update-00.txt
Pages : 14
Date : 2006-10-16
Currently BGP protocol can carry reachability information for
multiple Address Families (AFI) and Subsequence Address Families
(SAFI) using the Multiprotocol Extension[RFC2858], but it is limited
to grouping of information based on the AFI/SAFI hierarchy.
This document describes a mechanism to group and exchange prefix
information based on properties other than just the AFI/
SAFI[RFC2858]. The mechanism is flexible and backwards compatible
with the current methods for exchanging prefixes and hence does not
require any changes to the the protocol formats. It introduces a new
capability that allows two BGP speakers negotiate during the BGP OPEN
phase in order to define what each AFI/SAFI means.
In other words, the concept of a 'context' is defined and each such
'context' can be mapped to an AFI/SAFI. The context to AFI/SAFI
mapping is only relevant to the BGP peers of the BGP session and
hence offers great flexibility in how 2 BGP speakers can choose to
group and exchange prefix information.
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