BGP / Static / PBR

Unanswered Question
Jul 24th, 2009
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I'll attach simple diagram...


Scenario:


From R2, 192.168.3.0/24 should use the FR link and backup PPP. Segments 192.168.1.0 and 192.168.2.0 will use PPP and backup FR.


PPP uses static routes while FR is BGP routes.


any idea how to achieve this or any routing config?


route-map, prefix-list, floating static routes command ???






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yagnesh_tel Sat, 07/25/2009 - 05:11
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You will have to use PBR as you want to route packets based on their source addresses. In your case, 'policy based routing with object tracking' feature can be helpful.


http://www.cisco.com/en/US/tech/tk364/technologies_configuration_example09186a0080211f5c.shtml


http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtpbrtrk.html


Here interesting traffic is matched using ACL and its next hope will be set based on its availability using command: set ip next-hop verify-availability. Sequence number in this command can be used to specify primary and backup link for those matched packets. For example:


set ip next-hop verify-availability 10.1.1.1 10 track 123

set ip next-hop verify-availability 10.2.2.2 20 track 124


Above command set the next-hop to 10.1.1.1 if object 123 is up. If object 123 is down, the next hop will be set to 10.2.2.2 if object 124 is up. If object 124 is also down, then policy routing fails and unicast routing will route the packet.




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