A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing Working Group of the IETF.
Title : Route Target Constrained Distribution of Routes with no Route Targets
Authors : Eric C. Rosen
Keyur Patel
Jeffrey Haas
Robert Raszuk
Filename : draft-ietf-idr-rtc-no-rt-00.txt
Pages : 6
Date : 2015-01-05
Abstract:
BGP routes sometimes carry an "Extended Communities" path attribute.
An Extended Communities path attribute can contain one or more "Route
Targets" (RTs). By means of a procedure known as "RT Constrained
Distribution" (RTC), a BGP speaker can send BGP UPDATE messages that
express its interest in a particular set of RTs. Generally, RTC has
been applied only to address families whose routes always carry RTs.
When RTC is applied to such an address family, a BGP speaker
expressing its interest in a particular set of RTs is indicating that
it wants to receive all and only the routes of that address family
that have at least one of the RTs of interest. However, there are
scenarios in which the originator of a route chooses not to include
any RTs at all, assuming that the distribution of a route with no RTs
at all will be unaffected by RTC. This has led to interoperability
problems in the field, where the originator of a route assumes that
RTC will not affect the distribution of the route, but intermediate
BGP speakers refuse to distribute that route because it does not
carry any RT of interest. The purpose of this document is to clarify
the effect of the RTC mechanism on routes that do not have any RTs.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-rtc-no-rt/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-idr-rtc-no-rt-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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