switch 3750 high cpu in arp process.

[hatman]

Dear all,

Our switch is very high cpu in process arp

Am debug ip arp track command the result as below

-- on this switch have interface vlan 201 ip subnet is 10.11.201.1/24

Jun 5 15:30:40.732 GMT+7: IP ARP: rcvd req src 10.11.201.217 0001.6c6b.8ab9, dst 172.27.116.73 Vlan201

Jun 5 15:30:42.150 GMT+7: IP ARP: rcvd rep src 10.11.201.217 0001.6c6b.8ab9, dst 172.27.116.4 Vlan201

Jun 5 15:30:42.150 GMT+7: IPARP_TRACK: ARP tableid(0) 10.11.201.217 Vlan201 mode(1) modified.

Jun 5 15:30:42.150 GMT+7: IP ARP: rcvd req src 10.11.201.217 0001.6c6b.8ab9, dst 172.27.116

I don't know what wrong?

and then am try to shutdown vlan database 201 after that the cpu process has to normal state.

How to check the root cacus?

And how to protect ?

Sent from Cisco Technical Support iPad App

[flokki123]

hi,

have a look at this document.

it describes how to troubleshoot high cpu utilization on 3750 switches.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html#wp998829

hope this helps.