High CPU for cisco 2811

[HCL Support]

Hi Team,

We are facing issue of high CPU utilisation for Cisco 2811 Router installed in Customer premises and using for Internet connectivity.

Find attached here show tech-support for this Router and suggest us for next step,

Regards,

Ashutosh

[Konstantin Dunaev]

Hi Ashutosh,

on you F0/0 you have got following configuration :

ip flow ingress

ip flow egress

ip route-cache same-interface

ip route-cache policy

ip route-cache flow

ip policy route-map Asianet_out

I believe it forces the cisco2811 to process you traffic not in CEF but in CPU, the output of you "sh int f0/0" shows too  mane drops  and errors as well:

FastEthernet0/0 is up, line protocol is up

Input queue: 12/75/46201/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  30 second input rate 8085000 bits/sec, 5676 packets/sec

  30 second output rate 10007000 bits/sec, 1982 packets/sec

     1664261706 packets input, 3721208020 bytes

     Received 4976887 broadcasts, 1 runts, 0 giants, 1397 throttles

     475451 input errors, 6 CRC, 0 frame, 0 overrun, 475444 ignored

are the counters increasing?

[Konstantin Dunaev]

and could you please show the output from the command:

"show proc cpu sorted"

just enter it a couple of times in order to see which process takes so much CPU.