08-13-2009 11:07 AM - edited 03-04-2019 05:43 AM
I am trying to impact the incoming traffic on a particular subnet. I have two connections to the same ISP same AS at different locations and another connction to a separate ISP. I use filter list to control the advertised routes and all is well but there is one subnet that comes in location A isp A and I want it to come in location B isp A so I added a route map at location A for the specific subnet and set the metric so I should theoretically come in location B but instead I lost all connectivity for all subnets. If I use a route-map out does that override a filter list? As ever thx
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08-18-2009 02:48 AM
Thanks all for all the help I got it. Sorry I appeared so dense to some.
08-18-2009 02:52 AM
Bill,
It's ok. You are always welcome.
Best regards,
Peter
08-20-2009 12:08 AM
Peter,
last question for now. I see from the order of route selection that metric and local pref really are only for the same AS so if I have two networks I am advertising and I want return traffic to favor isp a over isp b it sounds like expanding the as-path is the only way.
08-20-2009 01:08 AM
Hello Bill,
Yes, you are right. In certain cases, if you have multiple connections to a single provider, you could influence his routing using the MED attribute, however, in general case if you have more distinct ISPs, the AS-PATH prepending is usually the only choice simple enough.
Best regards,
Peter
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