North American Network Operators Group

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Re: AS prepending

  • From: christian.macnevin
  • Date: Fri Apr 08 10:35:23 2005
  • Sensitivity:

Do they not have your routes present in their table *at all* or do they
just not point them to you?

If they have them but via another route, it may be that the shorter path
for them is via the ISP you're not prepending. Though unless they've got
free transit it would seem pretty dense not to use their own network to
reach their own customer.

Prepending 3 ASes isn't too much, you should be fine with that, I think.





Internet
[email protected]@merit.edu - 08/04/2005 15:28


Sent by:    [email protected]

To:    nanog

cc:


Subject:    AS prepending



To all,

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.

Thx

Philip



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