CAT 4510 High CPU usage

Suresh Varghese · ‎05-17-2011

My CAT 4510 switch is showing 99.9% CPU usage almost through out the day. After some analysis i saw that the “Cat4k Mgmt LoPri” process is having 86% CPU utilization. This process is a package that is including multiple process.

2. Within this package, two processes have been identified which are causing this shock which are “K5L3Unicast Adj Tabl” and “K5 L2 Hardware Addre” .

3. This indicates that some heavy activity is going on CEF adjacency table and RP MAC Address Table. My current IOS version is 12.2(53)SG and i want to upgarde this to 12.2(53)SG1.

C Can any one tell me if this will solve the issue and how clean is the 12.2(53)SG1 of bugs.

This switch is currently the gateway of my network configured for GLBP with another CAT 4507 switch. This switch is normal and showing only 37% CPU usage.

Alvaro Garcia · ‎05-27-2011

Process "K5 L2 Hardware Addre" is active, when new MAC addresses are learned and subsequently adjacency table has to be rewritten as well, hence If a packet is received with an unknown source MAC address, a copy of that packet is forwarded to the CPU for MAC address learning. This is also happening, when a packet with an already known source MAC address is received on another interface. A copy is sent to the CPU and this MAC is re-learned on another interface.

There is also a bug affecting the 12.2(53)SG and the fix was implement on 12.2(53)SG1. What type of supervisor module your 4500 has? This would be useful to suggest you an IOS code.