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CPU load

msundarganesh
Level 1
Level 1

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 2

paolo bevilacqua
Hall of Fame
Hall of Fame

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

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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