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Wireshark-users: Re: [Wireshark-users] Unknown OUI's...

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From: Dan_Wood@xxxxxxxx
Date: Mon, 9 Nov 2009 10:41:14 -0500

You may want to try:

show mac-address-table address <MAC Address: XX.XX..XX.XX.XX.XX>

This should give you the interface. Since the packets are unicast you may have had some sort of topology change. This would cause the mac-address table aging to become very short (STP forwarding delay?) and cause flooding until convergence. Normally, convergence would be somewhat short but it can take a long time if you have a flacky fiber run that are causing link up/downs (Topology changes).

Thanks,

Daniel Wood Network Engineer | 3Com Corporation
þ 350 Campus Dr. M/S 2.5.258, Marlborough, MA 01752
* Dan_Wood@xxxxxxxx
F Service and Support FAQ & Forums.

From: <Tim.Poth@xxxxxxxxxxx>
To: <wireshark-users@xxxxxxxxxxxxx>
Date: 11/09/2009 10:26 AM
Subject: Re: [Wireshark-users] Unknown OUI's...
Sent by: wireshark-users-bounces@xxxxxxxxxxxxx

This looks like Crestron
http://www.crestron.com/products/show_products.asp?type=commercial

Heidelbe has a few more hits so good luck there
http://standards.ieee.org/cgi-bin/ouisearch

I am way out of date on my cisco but I think you can look at what mac addresses are attached to what ports, might take some time but should be able to track down the port, unplug it and wait for someone to complain about something not working.

Good luck
tim

From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Phillip Nelson
Sent: Monday, November 09, 2009 10:14 AM
To: wireshark-users@xxxxxxxxxxxxx
Subject: [Wireshark-users] Unknown OUI's...

I just experienced a Vlan saturation event where the following source and destination MAC address were in all the packets causing the saturation. Does anyone recognize the OUI's of these two addresses? I have tried to look them up and can't find them anywhere.

The network has a 6509 for its core and 30 switches connected by fiber. Of the 30 switches, 11 are 4003's. Of the 4003's, 5 were affected by the storm and only two were participating in the storm. The trace was taken from the Cisco 6509 and the two participating Cisco 4003's. The broadcast storm was exactly the same between the two switches. We have ruled out all devices connected to the switches. We cannot find the MAC addresses anywhere on the network. We stopped the storm by resetting all the ports on the two 4003's.

Heidelbe_ab:99:6f Crestron_eb:ac:cf 0x883d Ethernet II

Phil Nelson
Arrow ECS
Infrastructure Engineer, Senior
28600 Fountain Pkwy
Solon, Ohio 44139

email- pnelson@xxxxxxxxx
w-216-332-3405
c-330-524-0463
f- 440-498-5178
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Follow-Ups:
- Re: [Wireshark-users] Unknown OUI's...
  - From: Phillip Nelson

References:
- [Wireshark-users] Unknown OUI's...
  - From: Phillip Nelson
- Re: [Wireshark-users] Unknown OUI's...
  - From: Tim.Poth

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