Hi,
High CPU Utilization on Cisco IOS Software-Based Catalyst 4500 Switches
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml
Troubleshooting High CPU on the Catalyst 4500-E Series Switch
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/troubleshooting/cpu_util.html
run this command: sh platform health
K2L2 Address Table R" is related to L2 entries and adjacency updates. The learning of MAC addresses on this box is done in software, so if we keep on learning too many mac addresses you will see a spike of CPU on this process. This may happen in the following conditions:
- constant receipt of spanning tree topology change BPDUs: on PVST that reduces cam aging and you will see entries being deleted too fast, on rapid-PVST/MST this flushes the entries. Overall a number of entries may need to be deleted/added again.
- traffic hitting a static route which points to a broadcast multiaccess interface (such as a vlan interface) so that the box needs to ARP for end user addresses constantly
- mac-address moves: where a user will move from one port to another , or a mac address may be looping in the network.
The "KxAclPathMan update" is related to path update that is expected to run whenever configuration changes, e.g. ACLs or QoS service-policy. It is normal for them to use high CPU for some time.
However, the utilization due to these processes should drop and stay low under steady conditions.
For detail explantion , please check this: https://supportforums.cisco.com/thread/2175235
Regards
