[c-nsp] BGP path preference

Stephen Wilcox steve.wilcox at packetrade.com
Thu Aug 30 11:20:53 EDT 2007


On Thu, Aug 30, 2007 at 11:07:36AM -0400, Jon Lewis wrote:
> On Wed, 29 Aug 2007, Andy Dills wrote:
> 
> > Don't forget that you can prepend incoming announcements as well as
> > outgoing announcements.
> >
> > For instance, to account for the fact that there is essentially an
> > extra AS in your transit path to 3356, you might just prepend a
> > single 22773 to everything Cox announces you.
> 
> This is what I'd do (and have done before) to even things out.  Some would 
> argue that when prepending received routes in a route-map, you should 
> prepend with your own ASN.  I've found it less confusing to prepend that 
> provider's ASN.  AFAIK, either works, and the latter certainly does as 
> it's what I've done.

Hmm interesting.. I always prepend with my own ASN as I thought that demonstrates it was me who inserted that AS to the path and I dont have authority to put other folks' ASN into public routes.

:)

Steve



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