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2621XM throughput and CPU Load

Hi

I have a cisco 2621XM interface fa0/0 is connected to the LAN and Fa0/1 to HQ. I can get the router to pass 80-90Mbps but CPU hits 98% and packets are dropped. Looking at the cisco docs for 2621XM I can only find the pps the router can cope with not how much traffic in bps it can handle. CEF is enabled and working so I pressume the router isnt designed to cope with passing up to 100Mbps.

Can anyone please advise if the router should be able to cope with this load.

Cheers, Kev

2 REPLIES

Re: 2621XM throughput and CPU Load

Were you able to identify the process which is utilizing high CPU.

can you psot the output of sh proc cpu

Narayan

New Member

Re: 2621XM throughput and CPU Load

The 2621XM only lists PPS because that is what the CPU is doing. Passing packets... the number of Mbps depends on the size of the packet.

You can overload the CPU using only 1Mbps of bandwidth worth of PINGs. Check if you have any ACL or policy routing on the Interface(s).

When you do a "show process cpu extended" (if using 12.4 IOS or up) and it will show you an exact output of what is draining your CPU.

Here is an output from my 2651XM with 1Mbps of large packet 1472 size ICMP. You can see it's already 39% with "IP Input" at the top of the list.

Router#sh process cpu extended

################################################################################

Global Statistics

-----------------

5 sec CPU util 39%/14% Timestamp 4d01h

Queue Statistics

----------------

Exec Count Total CPU Response Time Queue Length

(avg/max) (avg/max)

Critical 1 0 0/0 1/1

High 8 0 0/0 1/1

Normal 2046 1458 0/40 1/7

Low 13 0 0/0 1/2

Common Process Information

-------------------------------

PID Name Prio Style

-------------------------------

65 IP Input M New

CPU Intensive processes

-------------------------------------------------------------------------------

PID Total Exec Quant Burst Burst size Schedcall Schedcall

CPUms Count avg/max Count avg/max(ms) Count Per avg/max

-------------------------------------------------------------------------------

To sum it up, I think you are hitting peak capacity of the router. Keep in mind there is overhead in the packets that you are not using in your calculations to determine 80-90Mbps of traffic!

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