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Re: selective prepends (RE: Cogent service)

  • From: Olivier Bonaventure
  • Date: Mon Sep 23 03:08:00 2002

"E.B. Dreger" wrote:
> 
> > Date: Sun, 22 Sep 2002 23:16:20 -0400 (EDT)
> > From: jlewis
> 
> > Speaking of special...having played around a little with the
> > BGP communities supported by C&W and Sprint, I'm wondering
> > which other big transit providers (it seems almost a waste to
> > say Tier 1 anymore) support community strings that will let you
> > (the customer) cause them to selectively prepend route
> > announcements to their peers.
> 
> 1239, 3356, 3549, 3561
> 
> Other than that, I don't know of any positives.  I was going to
> compile a list and make a webpage... but I've had underwhelming
> response to past posts on the subject.

There is an ongoing effort with IETF to define a special type of 
extended communities to support this type of interdomain traffic engineering
in a standardize manner within the ptomaine working group.

See http://www.ietf.org/html.charters/ptomaine-charter.html

Those redistribution communities have been implemented in zebra
http://www.infonet.fundp.ac.be/doc/tr/Infonet-TR-2002-03.html


There is also a detailed survey of the utilization of communities that
might be of interest
http://www.infonet.fundp.ac.be/doc/tr/Infonet-TR-2002-02.html


Best regards,


Olivier Bonaventure




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