[c-nsp] BGP-policy using communities

Danny McPherson danny at tcb.net
Fri Oct 1 11:20:53 EDT 2004

On Sep 27, 2004, at 11:18 AM, Carlos Fragoso Mariscal wrote:
> 2- Tag prefixes announced by peers (tagged with their communities or
> using a determined as-path) in a way that inside the AS prefixes from
> transit provider 1,2,n and IXPs are tagged differently.
> I have seen that many of the ISP's/Telcos provide this service. I have
> been browsing websites in order to find a minimum example
> configuration to provide this service on a backbone based on cisco
> routers.
> Can anyone provide me a URL or meaningful example configuration?

RFC 1998 is a good place to start.  You can easily extend
the functionality outlined there to include other capabilities as
well (e.g., AS_PATH prepending, though I'd really recommend that
you have the origin AS perform all prepending).



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