[c-nsp] Inbound traffic

Jon Lewis jlewis at lewis.org
Tue Feb 9 22:23:25 EST 2010

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                |
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