I am having an issue with a broadcast storm on my network. We have a Cisco ASA 5512-X, and under it is a WLC 2504 with a Netgear Prosafe Managed switch, and 4 2602 APs. For wired, we have unmanaged switches.
Internal and external traffic stops, and when using wireshark I get a bunch of Pause packets, and every so often one points to the MAC address of the Prosafe switch. STP is turned on at a level of 10. I have also noticed a lot of ARP and NetBios requests as well.
When the storm starts, if I unplug the WLC the storm stops once the packets reach their TTL and everything comes back up. I have been unable to figure out where the problem machine lies. Anyone have any ideas?
EDIT: I just found this in wireshark, and there are 6900+ entries, one right after the other. 192.168.1.X is not a part of our network. 192.168.15.X is our internal network. Does this look like BS to you? It looks like BS to me.
2788596 17:33:44.370447000 192.168.1.2 Broadcast ARP 60 Who has 192.168.15.1? Tell 192.168.15.186 (duplicate use of 192.168.15.186 detected!)