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CPU load

In our network, we have a 3550 Switch in which the CPU Load is increasing and then decreasing. sometimes it raises to 100%. but there was no traffic during that time. Pls give us what are the possible reason for thsi issue.

Sundar

2 REPLIES
Hall of Fame Super Gold

Re: CPU load

Do "show proc cpu sorted". Check or post output here.

Re: CPU load

Hi Sundar,

CPU load can increase due to many reasons.

Reasons why CPU load can bump up...

1. Routing loops (L3)

2 Broadcast storms ( L2 looping)

3. Spanning tree processes and TCN's

4. packets being process switched

5 BGP scanner... etc.

6 Large routing tables on lower end routers...

7. ICMP redirects...

8. Heaps of ACL's(access-lists) etc..

9. SNMP polling etc..

10. Turning on debug and not turning it off..

The above are just a few..there could be many other reasons as well.. Please find the below link that gives you a little bit more info on symptoms/fixes etc.

http://www.cisco.com/en/US/products/hw/switches/ps646/products_tech_note09186a008078ece1.shtml     <---specific to Cisco 3550

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a70f2.shtml#initial_trblshooting

HTH,

Please rate if useful.

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