Cisco 7604 logs

[n.taka]

Hi,

We have found some logs (see attached) on our Cisco 7604, c7600rsp72043-advipservicesk9-mz.151-3.S5.bin. We thought that this could be the cause of customer complain.

Please if someone can explain the meaning of this log.

Jun 23 04:47:20.754 FJT: %MLSCEF-SP-4-FIB_EXCEPTION_THRESHOLD: Hardware CEF entry usage is at 95% capacity for IPv4 unicast protocol.

Appreciate your assistance in advance.

regards

Navi

[Aleksey Stepanov]

We also had the same problem.

Some of our clients had a problem with a packet loss to some resources and low connection speed.

Also we lose IPSec tunnels between the ASAs in our network.

I think this message is caused by TCAM memory exhaustion because of too large routing table. (We have 3 full views from the uplinks and some routes in vrf's.

What we did:

mls cef maximum-routes ip 716
mls cef maximum-routes ipv6 80

These commands will  increase your IPv4 capacity in TCAM and the message should go away.

Then you need to reboot the router.

These manipulations have helped us.
 

[n.taka]

Hi Alex,

Thanks very much, we'll try this option as we had already rebooted the router but still the message keep on appearing.

Appreciate your help.

regards

Navi

[n.taka]

Hi Alex,

We have made the changes, and the L3 fowarding utilization has drooped from 95% to 60%.

Thanks very much for your help.

regards

Navi

[Aleksey Stepanov]

You are welcome. I hope it will help you.