PBR: set ip default next-hop

Answered Question
Jul 4th, 2008

Hi,

Just a quick question about policy-based routing. For example, packets

that came from 10.0.0.0/8 going to 20.0.0.0/8 should be routed to

next-hop 1.0.0.1. I used the command set ip default next-hop 1.0.0.1. If

the routing table has an entry for 20.0.0.0/8 (for example an OSPF/EIGRP

entry) network then the policy routing shouldn't work right? The route

entry for 20.0.0.0/8 should be removed from the routing table in order

for PBR to work. That's my understanding between set ip default next-hop

and set ip next-hop. Where set ip next-hop command routes the packet to

the next hop router ignoring the route entry in the routing table. Am I

understanding it correctly?

For the set ip default next-hop, what if 20.0.0.0/8 was gone in the

routing table but there was a default-route, the policy-routing should

still work right? Default-route entry is being ignored in this case.

Please correct me if I'm wrong. Thanks.

John

I have this problem too.
0 votes
Correct Answer by foxbatreco about 8 years 5 months ago

Yes..the policy route will be used if the route in question is no longer in route table , even if the default path is available.

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foxbatreco Fri, 07/04/2008 - 08:21

With set ip default next-hop ,if the 20.0.0.0/8 entry is found in route table, it will not use policy routed configuration but will use the path in the routing table.

If u need to override the route table entry, u will have to use set ip next-hop.

Pls rate/mark if this helps!!!

John Patrick Lopez Fri, 07/04/2008 - 08:57

Yes that's what I understand. What about the default-route? If the 20.0.0.0/8 was gone in the routing table but the routing-table has a default-route, will it still be policy routed or will it follow the default-route?

Correct Answer
foxbatreco Sat, 07/05/2008 - 11:36

Yes..the policy route will be used if the route in question is no longer in route table , even if the default path is available.

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