CATALYST 4000 HIGH CPU UTILIZATION

[viktor.m]

Helo!

Could anyone, please, help me to figure out why do I have such a big CPU utilization on my Catalyst 4000 (see attached file with commands output)? Also, while telnetting to switch it's so slow to put or get something from switch.

Thank you in advance,

Viktor

[Prashanth Krishnappa]

High CPU is in "Packet forwardi" process. I am suspecting there is excessive broadcast/multicast/unknown unicast traffic in the network. You have most ports in VLAN 1 which is aggravating this as well.

[viktor.m]

Thank you. Yes, we found one port causing this. After we disconnetcted it utilization now is 20%. Thanks a lot, Viktor