North American Network Operators Group
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Re: AS prepending

  • From: Patrick W Gilmore
  • Date: Fri Apr 08 10:37:45 2005 
On Apr 8, 2005, at 10:28 AM, 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.
If they are both transit providers, then they are broken.

If they are peers, the second ISP is probably preferring the route it hears through your transit provider because there are fewer AS hops.

--
TTFN,
patrick