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A high CPU Utilization

HI all

we are facing core 4506E switch high CPU Utilization problem pls help me. Recenly we add one huawei s5700-28C-EI which uplink to our core ciscco 4506E. This is the log on my core cisco 4506E switch:

Dec 25 16:38:47: %SYS-1-CPURISINGTHRESHOLD: Threshold: Total CPU Utilization(Total/Intr): 83%/1%, Top 3 processes(Pid/Util):  52/65%, 51/5%, 104/5%

Dec 25 16:40:12: %SYS-1-CPUFALLINGTHRESHOLD: Threshold: Total CPU Utilization(Total/Intr) 20%/0%.

Dec 25 17:28:02: %C4K_EBM-4-HOSTFLAPPING: Host 00:0C:29:60:42:BF in vlan 180 is moving from port Gi2/6 to port Gi5/4

Dec 25 18:36:51: %C4K_EBM-4-HOSTFLAPPING: Host 00:0C:29:0A:40:7B in vlan 180 is moving from port Gi3/4 to port Gi2/5

Dec 25 18:37:07: %C4K_EBM-4-HOSTFLAPPING: Host 00:0C:29:0A:40:7B in vlan 180 is moving from port Gi2/5 to port Gi3/4

Dec 25 19:07:55: %C4K_EBM-4-HOSTFLAPPING: Host D4:BE:D9:AD:AA:15 in vlan 180 is moving from port Gi2/5 to port Gi5/4

Dec 25 19:07:55: %C4K_EBM-4-HOSTFLAPPING: Host D4:BE:D9:AD:AA:15 in vlan 180 is moving from port Gi5/4 to port Gi2/5

Any suggestion?

1 REPLY
Bronze

A high CPU Utilization

Hello Dong,

You are having a bridging loop. Check the devices connected on gi5/4 and gi2/5

Show cdp neig gi5/4 deta

Show cdp neig gi2/5 deta

Once you know what our neighbors are, go on our neighbors and issue the following multiple times:

show mac-address address 00:0C:29:60:42:BF.

You have vmware and dell vendors involved. Check for nic teaming on the vmware side.

You should see this MAC being learned on the interface connected to gi5/4 or gi 2/5 sometimes, and another

interface the other times.  Once you know which ports these respective switches are learning the MAC from, issue

the 'show cdp neighbor' and do this again.

Eventually, you should get to a pair of ports that aren't connected to a switch, and only have this MAC learned. 

Once you have these ports, you should be able to figure out what kind of devices these are, and why they are sourcing

traffic from the same MAC.

You can enable to debug command to identity the top interfaces that send traffic/packets for CPU processing.

Switch#debug platform packet all count

Switch#show platform cpu packet statistics

Switch#unde all

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

Haihua

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