07-07-2008 04:53 AM - edited 03-03-2019 10:37 PM
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
07-07-2008 05:57 AM
Do "show proc cpu sorted". Check or post output here.
02-18-2011 03:33 AM
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
HTH,
Please rate if useful.
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