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bgp network advertisement question

S

saimike

Senior member
i have 2 "hub" routers (physically located in different buildings) connected via 2 WAN links. 1 WAN link is a T1 and the other is a T3.

router-a == hub-router-1 ** T1/T3 *** hub-router-2 == router-b

traffic-stream-1 from router-a to router-b will need to go through the T3 via the hub-routers.
traffic-stream-2 from hub-router-1 to hub-router-2 will go through the T1.
fwiw, the T1 is terminated with flexwan cards and the T3 with 7206 routers on either side.

right now, i have bgp setup and prefix lists setup to prevent the 2 diff traffic streams from going over the "wrong" WAN link.

is there a more elegant way of doing this?
 
policy based routing with route maps.

whenever you need to send different traffic down different links its preferable to just do route-maps/policy based routing.
 
i'm not totally aware of all the traffic types. all i want to do is route traffic through the t1/t3 wan links according to their origin (by AS#) ...
 
Originally posted by: saimike
i'm not totally aware of all the traffic types. all i want to do is route traffic through the t1/t3 wan links according to their origin (by AS#) ...
Click to expand...

you could probably do that with Local Preference in BGP as well. Create a pre-fix list and then use that to set local preference.

If you're wanting to control by AS then BGP would be better than route-maps (which are more ip subnet centric...meaning if traffic matches this criteria send it here)

try here...
http://www.cisco.com/en/US/tech/tk365/t...guration_example09186a00801475b2.shtml
 
Remember to check on what things (like CEF) need to be enabled for your model to do policy routing fast. Sometimes turning it on means your forwarding rate plumments.
 
Originally posted by: cmetz
Remember to check on what things (like CEF) need to be enabled for your model to do policy routing fast. Sometimes turning it on means your forwarding rate plumments.
Click to expand...

good point, but don't you think local pref is the answer here?

At first I was going down the policy routing path, but then realized he wanted to do it by AS.
 
bgp's local pref would be how I'd do it - no performance impact, and it only slightly munges the bgp config.
 
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