North American Network Operators Group
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Re: AS prepending

  • From: Philip Lavine
  • Date: Fri Apr 08 11:05:50 2005
  • Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
  • Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; b=xAPMyRTsbAzOGPa3F/6o1WxlUchjna1b/L5GERXCEn5Bu1ilXcJDxBDu1StNes8joiZdmkwDF278v9k2Kb6BjQezWkudtLd+5f0g1p7ZLY6GjNtSLehgJsiiK5t/WLrSgE4zCWTQqzpiISsplEVoXUXIjU31H9q2m9cuZUFHrx0= ;
Update:

I am prepending my AS 3 times to the un-preferred ISP.
Both ISP's are my peers. The un-preferred ISP claims
the see my advertisement yet they do not add it to
their routing table (suggests filtering??). They claim
all the filtering they are doing is based on the
networks I told them over the phone that I was using
with that AS.

Philip

--- Jon Lewis <[email protected]> wrote:
> On Fri, 8 Apr 2005, Philip Lavine wrote:
> 
> > I am using AS prepending to favor one ISP over
> > another, in a BGP multihomed/multiISP scenario.
> Why
> > does the ISP receiving the prepends fail to add my
> > network into their routing table? Is this a
> "feature"
> > of BGP, or have I gone too far with 3 prepend
> > statements.
> 
> Who's ASN are you prepending on your advertised
> routes?
> 
>
----------------------------------------------------------------------
>  Jon Lewis                   |  I route
>  Senior Network Engineer     |  therefore you are
>  Atlantic Net                |
> _________ http://www.lewis.org/~jlewis/pgp for PGP
> public key_________
> 

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