[c-nsp] Determining which ports have another switch attached?

[Martin T]

Phil, Gabriel,
one situation where this MAC counting does not work is when there is a
virtual machine hypervisor connected to a switch port and virtual
machines have NIC's configured to bridge mode.

IMHO counting MAC addresses in combination of checking incoming BPDU
frames on particular interface is probably the best option if CDP is
not enabled..


regards,
martin


2011/7/21 Matlock, Kenneth L <MatlockK at exempla.org>:
> 'sho spanning-tree vlan <VLAN_ID> detail | inc BPDU|Port'
>
> Look for ports with BPDU received > 0
>
> A switch coming up will probably send at least 1 BPDU before determining
> it's not the root.
>
> This of course, is assuming the switch at the other end actually talks
> STP :)
>
> Ken Matlock
> Network Analyst
> Exempla Healthcare
> (303) 467-4671
> matlockk at exempla.org
>
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Pauly
> Sent: Thursday, July 21, 2011 7:37 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Determining which ports have another switch attached?
>
> Is there an easy way to determine which swtich ports have another
> switch attached to them (assume non-CDP supporting) before enabling
> bpduguard?
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