[c-nsp] Changing from iBGP to eBGP - Again

[Oliver Boehmer (oboehmer)]

Mark,

it would be best if you pasted your current BGP config and topology so
we know what you are doing today. I assume you have an iBGP peer to your
upstream, and do route-reflector-client to your iBGP peers in order to
reflect the upstream routes to them and vice versa.
Changing this to an eBGP config should be easy, you wouldn't need
RR-client configuration anymore, and you want to investigate
next-hop-self on your iBGP peers (possibly not a requirement as you had
to advertise the upstream's next-hop into your IGP previously).

Or do you also need to change your ASN, so you'd need to touch all
routers? This is a larger migration task than just change one neighbor..

please clarify..

	oli


Mark Tohill <> wrote on Wednesday, July 06, 2005 5:37 PM:

> I realize this is probably against rules of list but I'm reposting
> this during what seems a busy time.
> 
> 
> 
> Any help appreciated.
> 
> 
> 
> Thanks,
> 
> Mark
> 
> ________________________________
> 
> From: Mark Tohill
> Sent: 05 July 2005 11:32
> To: cisco-nsp at puck.nether.net
> Subject: Changing from iBGP to eBGP
> 
> 
> 
> Hi,
> 
> 
> 
> We're hoping to change our setup with our sole up-stream provider
> (peered with them across 2 x  PoPs) from iBGP to eBGP. We hope this
> will give us more flexibility and control in the future
> 
> 
> 
> -          we accept the full routing table.
> 
> -          advertise non-contiguous (!!!) portions our our address
> space from each of our PoP's.
> 
> -          already secured our own ASN from RIPE.
> 
> -          have out-of-date route objects in RIPE which we are hoping
> to amend. (or our provider, they maintain them)
> 
> -          hope to request this change fairly soon.
> 
> 
> 
> 
> 
> Has anyone out there hands-on experience of same/similar?
> 
> 
> 
> Apart from neighbor configuration (remote-as etc...), are there any
> other major config changes?
> 
> 
> 
> Are there any potential pitfalls?
> 
> 
> 
> Thanks,
> 
> Mark
> 
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