Since two days now, our CPU's Backbone is running hot (around 90/95%) during the work days. By doing a "show processes cpu sorted", we can see the "Cat4k Mgmt LoPri" runnning hot. Then when we do a "show platform health | ex 0.0" we can see the "K2L2 Address Table R" running hot too.
So because of this "K2L2 Address Table R", our Backbone is burning. We can't find any clues on the web about what is that process exactly, it's not because of the Spanning-tree, not because of the dynamic table, and the CPU seems to running hot especially in work hours, because it's running normaly during night.
We tried to make some research with a wireshark as Cisco advices in the "High CPU Utilization on Cisco IOS Software-Based Catalyst 4500 Switches" help, but according to those logs, everything seems to be ok...
We saw a topic about this problem on the cisco support, but it seems to be dead.