I'm living a problem in our MPLS network and would like to share you experience.
One of our Extreme X460 switch is experiencing high CPU load and with process mpls and bcmRX in the top of the processes with high utilisation.
using show l2stats we saw that between our many vlans, three (3) of them are sending abnormal amount of packets to CPU.
In the begging we have tried to capture the traffic of this vlans, but there is a huge amount of traffic, and I wasn't able to determine with packets are been really sent to cpu.
So, I would like your help is this two topics:
1. How can i determine exactly with packets in that VLAN are being sent to CPU ? Is there any sniffer, debug of monitor inside EXOS that I can have a sample of this packets ?
2. How can I prevent packets from being sent to CPU. Considering that one of this vlans are just an L2 vlans between two ports, and we don't have L3 IP address on the vlan, I was not suppose to receive any packets on CPU except by protocols packets... How can I create filters for that ? Any sugestions ?
Thanks a lot for any help.
Network Engineering - Durand Tavola