CPU load

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Jul 7th, 2008
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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

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paolo bevilacqua Mon, 07/07/2008 - 05:57
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Do "show proc cpu sorted". Check or post output here.

Kishore Chennupati Fri, 02/18/2011 - 03:33
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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,


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