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Re: expectations for bgp peering?
From: Jon Lewis <jlewis () lewis org>
Date: Wed, 21 Jan 2009 08:17:24 -0500 (EST)

On Tue, 20 Jan 2009, mike wrote:

So I am just wondering what my expecations should be in a bgp peering scenario where I am multihomed with my own ASN and arin assigned ip space. At issue is the fact that my backup isp forced me to use ebgp multihop to peer with a router internal to their network and not the border router I am directly attached to, and secondly, that they say I am not allowed to prepend at all - they will do it for me, and from the looks of things they have established a route-map that just prepends their AS 6 times to my announcement.

Assuming you're getting full routes from this provider, I wouldn't be surprised if the multihop is required because their router you're connected to doesn't have or can't handle full BGP routes. I've done this with customers in the past when they were connected to routers that didn't have the RAM for full routes.

As for the "you're not allowed to prepend" thing, have you experimented to see what happens if you try? Unless they're giving you special pricing based on the idea that they're providing you with strictly backup transit, they shouldn't be doing the prepending (unless you've asked them to or used communities to tell them to).

This smells of bad engineering. I have looked up the bgp report for my provider and they have 0 downstream AS's, and the week that this project has taken (and it's still not up and working) has left me with less than absolute confidence in the provider. I want to know if anyone has an opinion on ebgp

Only a week? I've seen BGP turnups take much longer...not that they should.

 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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