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Broadcast storm issue

Posted on 2014-09-18
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Last Modified: 2014-09-24
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!)
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Question by:LA_Admin
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Expert Comment

by:Craig Beck
ID: 40331769
If the storm stops when the WLC is disconnected I'd look at things like LAG and STP on the WLC.

How is the WLC configured to connect to the switch?  Does it use LAG, or multiple ports configured as active and backup?  Is STP configured on the WLC?  How about the switch?  What's its configuration to link the WLC?
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LA_Admin earned 0 total points
ID: 40333382
I found an Ethernet cable with both ends plugged into a switch that was hidden on someone desk. Loop removed, and we have been stable since.
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Author Closing Comment

by:LA_Admin
ID: 40341131
This was the root cause of our issue
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