Have you looked at what kind of route that ISP has when homing into your network through your transit2? Probably not any better... since you said transit1 is bigger netowrk, but you never know...

Prepend some AS paths to transit1 temporarily for testing, and see how traffic comes into thru transit2 from that ISP.

Unfortunately, you don't really have full control of transit1's routing policy with the carrier1 and carrier2...

-hc

-- 
Sincerely,
  Haesu C.
  TowardEX Technologies, Inc.
  WWW: http://www.towardex.com
  E-mail: haesu@...
  Cell: (978) 394-2867

On Tue, Jul 01, 2003 at 02:07:30PM +0200, Wim Godden wrote:
> Hope some of you have suggestions for this :
> - We have 2 transit providers (call them transit1 and transit2). Most traffic runs through 
> transit1, due to the fact that it's a larger and better-connected network.
> - Customers from a certain ISP want to connect to us very fast (we have gameservers, 
> so latency is important).
> - The ISP has 2 possible routes to our transit1 : carrier1 and carrier2.
> - The fastest route is carrier1 (12ms).
> - The other route (via carrier2) is slower (40ms).
> - It seems carrier2 is cheaper for them and they've set a preference for that route.
> - How can we influence this route, so that carrier1 is used, if it's possible ?
> 
> 
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Replies

[isp-bgp] Changing inbound traffic, Wim Godden