[c-nsp] Virtual-ish eBGP

[Nikos Leontsinis]

both solutions are ugly and they don't scale
if you are buying full routing table from as2 you should be receiving AS4s
prefixes


----- Original Message ----- 
From: "Nick Kraal" <nick at arc.net.my>
To: <cisco-nsp at puck.nether.net>
Sent: Wednesday, August 11, 2004 12:14 PM
Subject: [c-nsp] Virtual-ish eBGP


> Dear all,
>
> I have the following scenario. I am AS1 and buy transit from AS2. I can
> reach AS3 via AS2. Now I would like to reach AS4 also. However AS2
> filters AS4 announcements to me learned via AS3. Routing to AS4 is
> otherwise via Timbuktoo.
>
> AS1--AS2--AS3--AS4
> |                |
> + ---Timbuktoo---+
>
> Since the network administrator of AS3 was an old room mate of mine in
> college, he has no issues for me to reach AS4 via the AS2-AS3 combo.
>
> We are looking at a few ways to overcome the strict AS2 routing policy
> and am looking at few possibilities.
>
> [1] Running eBGP multihop between AS1 and AS3.
> [2] Running eBGP on a /30 tunnel (virtual link) between AS1 and AS3.
>
> AS3 will then announce AS4 via either the above methods. Are there any
> comments on this 'cost-effective/cheap-ar**' bilateral peering approaches.
>
> Thanks in advance,
>
> -nick/
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>