[nsp] Using router or switch to detect "other" switches.

Church, Chuck cchurch at wamnetgov.com
Thu Feb 5 13:57:48 EST 2004

Enabling port security, allowing only 1 mac at a time per port will put a quick end to the Netgears.  Also, I think there is something called 'bpdu-guard' that will let a port function in either port fast mode or with spanning tree totally off.  But if it receives a BPDU on that port, it shuts it down immediately.  Other than that, you could span the VLAN and look for non-Cisco BPDUs, based on the MAC OUI.

Chuck Church
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch at wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com

> -----Original Message-----
> From: Chapman, Matt [mailto:chapmam2 at ocps.k12.fl.us]
> Sent: Thursday, February 05, 2004 9:26 AM
> To: cisco-nsp at puck.nether.net
> Cc: Sagon, Keith
> Subject: [nsp] Using router or switch to detect "other" switches.
> Is it possible to do rogue detection of switches that are not cisco
> similar to how you can use the Cisco Aeronets to detect rogue Access
> Points?
> We are in a fight to find and replace those pesky little Netgear
> switches that so many people are using to get around pulling a wire or
> even using a cisco 2940.
> Thanks,
> -- Matt Chapman
> Matt Chapman
> Network Engineer
> "I think computer viruses should count as life. I think it says
> something about human nature that the only form of life we 
> have created
> so far is purely destructive. We've created life in our own image."
> Stephen Hawking (1942 - )
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