Hi Jon & Aftab, Thank you very much for your inputs.
Anyway, I agree but you might confuse on my inquiry. In the internet cloud, there are lots of interconnected AS and if I'm going to prepend the announcement to AS200 and AS300 - all inbound traffic will pass to AS20 alone. Actually, what I want is - to isolate specific AS (AS1) to pass via AS400-AS20-AS30 as the primary returned path while other AS from the internet cloud would be still the best path going to AS30. Thanks. --- On Wed, 2/10/10, Aftab Siddiqui <[email protected]> wrote: From: Aftab Siddiqui <[email protected]> Subject: Re: [c-nsp] Inbound traffic To: "Jon Lewis" <[email protected]> Cc: "Sherwin Torres" <[email protected]>, [email protected] Date: Wednesday, 10 February, 2010, 1:05 PM Hi Sherwin, Inbound traffic can also be altered on the basis of prefix-advertisement. If you are advertising more specific prefix i.e. /22 or /24 (though not recommended with tier1 service providers) your inbound traffic will always take the desired path. and yes as-path prepend is also an option. Regards, Aftab A. Siddiqui On Wed, Feb 10, 2010 at 8:23 AM, Jon Lewis <[email protected]> wrote: On Wed, 10 Feb 2010, Sherwin Torres wrote: 1. AS1 - AS200 - AS30 2. AS1 - AS300 - AS30 3. AS1 - AS400 - AS20 - AS30 In the above scenario, I am using AS30 and I need to access AS1. The outbound traffic can be force using the localpref to prefer which path I can use for the outbound however, my dilemma is the inbound traffic. Since sample 1 and 2 has lesser path from AS1 going to AS30, this might be the best in returned path while sample 3 is the least priority due to longer path. Is there a way can I manipulate the inbound and outbound via sample 3 without contacting AS1? The short answer is as-path prepending of your announced routes to as200 and as300. ---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ Design your own exclusive Pingbox today! It's easy to create your personal chat space on your blogs. http://ph.messenger.yahoo.com/pingbox _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
