Cat6500 FIB Processor High

[johnyoon75]

Urgent..

Cat6500 FIB processor high. I don't know why...

How can i fall down the Supervisor FIB processor in Cat6500 with CatOS.

[Georg Pauwen]

Hello,

you might want to try to configure FIB rate- limiting, which allows all packets that require software processing to be rate limited:

6509(config)# mls ip cef rate-limit 1500

Be careful though, since FIB rate-limiting does not differentiate between legitimate and illegitimate traffic (for example, tunnels, Telnet).

Regards,

GP

[skarundi]

A high cpu utilization due to the FIBtask on the supervisor is usually because there is some routing instability. Each time you get a route change, the MSFC downloads CEF information down to the switch and the switch reprograms its CEF table.

To find out what is causing the CEF instability, log into the router and turn on CEF logging.

The global config command is something like " ip cef event 2000"

Then issue the "show ip cef event" command from the exec prompt and monitor the changes in CEF on the router.

Common causes are incorrect BGP configuration, such as the case where the next hop IP of a BGP prefix is actually a BGP route itself.