Router CPU usage goes high!

Answered Question
Jul 21st, 2008
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My company has ~400 users. I use a 2801 router to route traffic between vlans ('cause we just have some layer 2 catalysts and this router) and nat for internet access. Our network model looks like this: IPS -> Router -> users. On subinterfaces, I've already used:

no ip redirects

no ip unreachables

no ip proxy-arp

But the cpu usage still goes high around 70~80%.

Do u have any ideas to reduce the cpu usage?

Correct Answer by Justin Brenton about 9 years 5 days ago

Hi dattx_fis2,

Is the 2801 being used for IP phones as well?

Have you turned off all debugging?

Try this

HTH, Please rate if so.



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Overall Rating: 4 (1 ratings)
dattx_fis2 Tue, 07/29/2008 - 01:09
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Tks Justin.

All debbing are turned off and we don't use IP phones. I think the traffic load is so high and maybe some PCs have virus. I'm going to change the interrupt request timer by changing scheduller allocate command

a.alekseev Tue, 07/29/2008 - 01:11
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show the output

#sh proc cpu sorted 5min


#sh proc cpu | e 0\.00

#sh ip traffic

dattx_fis2 Tue, 07/29/2008 - 02:12
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I think I find the reason: I use both netflow and snmp on the router, snmp traps send to 2 mgmt servers. The router is polled too often so the cpu usage goes high


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