CEF table on 3750 contains inactive next-hops

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Jul 12th, 2007
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Hello Everyone,

I have policy based routing setup on our 3750s located at 4 remote sites. I have setup the policy based routing with "set ip next-hop verify-availability" option and also enabled CDP on the 3750 and the next-hop (WAAS engine).

Here comes the weird bit. In case the WAAS engine fails, the 3750 should stop policy routing. This failover works at one of our sites but the other 3 sites loose all their connectivity. This is because the 3750 is still forwarding packets to the inactive WAAS engine.

I checked the CDP neighbor list and the engine is not listed in it when its down. But the engine is still listed at the next hop in the CEF table (show ip cef).

I have tried disabling ip route-cache cef on the interface but that didn't help. I also compared the configs on all 3750s and they look no different.

I need some urgent help here. This issue is like a disaster waiting to happen.

All the 3750s are running : IOS (tm) C3750 Software (C3750-I5-M), Version 12.2(20)SE4, RELEASE SOFTWARE (fc1)



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ankit_parikh Mon, 07/16/2007 - 23:33
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Did I ask a very tough question???

I will go somewhere else with my query.



wochanda Fri, 08/10/2007 - 06:28
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If you're doing policy-routing as a workaround to the 3750 not supporting WCCP you dont need to anymore.

Starting in 12.2(37)SE, WCCP is natively supported on the 3750. If you upgrade and change your config to this, you can let the WCCP protocol take care of the verify-availability, and it wont be a "disaster waiting to happen".


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