JORGE RODRIGUEZ Sun, 07/06/2008 - 11:46
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Vinoth,


Things you may want to first look into is access switch logs and core switches logs if any, look for flapping interfaces specially if you have dual uplink connections to a dual core switches, go over these links bellow


show log

show process cpu <-- flapping interfaces and/or bridging loops will also cause high cpu utilization, more details in bellow link.


See Identify the loop section in STP link

Troubleshooting STP

http://cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080136673.shtml


If you have an HSRP environment on your core switches and happened to see HSRP SSTANDBY-3-DUPADDR message logs most of time is due to STP configuration issues, this link will give you a more thorough perspective on these type of messages.


Troubleshooting HSRP Problems - STP

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094afd.shtml




Rgds

-Jorge


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