Fw: [c-nsp] eBGP --> OSPF --> eBGP vs eBGP --> iBGP --> eBGP

Full of fail ... Love it
------Original Message------
From: Joe Provo
Sender: cisco-nsp-bounces@puck.nether.net
To: Adam Greene
Cc: cisco-nsp@puck.nether.net
ReplyTo: jzp-cnsp@rsuc.gweep.net
Subject: Re: [c-nsp] eBGP --> OSPF --> eBGP vs eBGP --> iBGP --> eBGP
Sent: Apr 27, 2009 6:05 PM

On Mon, Apr 27, 2009 at 02:05:17PM -0400, Adam Greene wrote:
> Hi,
>
> We run BGP to our upstream providers and OSPF on our local backbone.
>
> We have a customer who will be multihomed and needs us to advertise his IP blocks to us via BGP.
>
> My question is how best to propagate his AS-PATH prepending to
> my upstream providers. Is it possible to inject this information
> into OSPF and then into the eBGP to my upstreams?

Possible yes, but full of fail.

> Or should I plan on establishing iBGP sessions between the backbone
> router that will be servicing the customer and the routers facing
> my upstream providers? I assume the latter ....

Yes. For maximal win along the axes (scalable,flexible,maintainable),
your OSPF should only carry only loopbacks and network edges (just
enough to enable next-hop processing of BGP) and your iBGP should
carry all the prefixes.

Cheers!

Joe

--
RSUC / GweepNet / Spunk / FnB / Usenix / SAGE
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