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8.2

IP Input High CPU Utilization

Asked by tealnet in Network Routers

Tags: cpu, high, ip, input, utilization

We have a Cisco 2600 Series router w/ firmware version 12.0(7)T and 32mb of memory connected to a full T1.  The problem we are experiencing is about every 24 hours we have to restart the router because it's getting bogged down.  The CPU utilization at the time we reboot it is around 75% and ping times are anywhere from 500ms to 2000ms.  As soon as it's restarted it's good for another day or so.  But it progressively gets worse and worse.  The router shows the IP Input process using nearly all of the CPU.  The next closest process is at 1%.  The router has one serial and one ethernet interface.  The ethernet interface has three internal class C's configured for which it is routing and providing internet via NAT.  Other than a couple of port forwards, there really isn't anything else setup in the router.  There are about 300 network devices that use this router.  MRTG graphs show during the day the peak average bandwidth use is around 100kbytes.  But this problem doesn't get any better even when no one is using their computers, like at 2am when there's little to no activity on the network.  I did a little research and I did enable "ip route-cache same-interface" and "ip-route-cache policy" which were both disabled.  This had absolutely no effect.  I checked for some classic signs of DoS attacks, like large numbers of broadcast packets, etc.  But there was nothing out of the ordinary.
[+][-]03/12/04 01:16 AM, ID: 10579077Expert Comment

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[+][-]03/12/04 03:43 AM, ID: 10579656Expert Comment

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[+][-]03/12/04 12:46 PM, ID: 10584309Expert Comment

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[+][-]03/13/04 07:56 AM, ID: 10588036Author Comment

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[+][-]03/13/04 08:09 AM, ID: 10588136Expert Comment

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[+][-]03/13/04 08:22 AM, ID: 10588204Expert Comment

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[+][-]03/13/04 09:52 AM, ID: 10588553Accepted Solution

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About this solution

Zone: Network Routers
Tags: cpu, high, ip, input, utilization
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Solution Provided By: lrmoore
Participating Experts: 5
Solution Grade: A
 
[+][-]03/13/04 10:03 AM, ID: 10588604Author Comment

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[+][-]03/14/04 08:29 AM, ID: 10592378Expert Comment

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[+][-]06/04/04 03:33 AM, ID: 11231115Expert Comment

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