[c-nsp] Identifying device(s) connected to cisco L2-only switch

[Dan]

Hi ,

I would say set on port :

port-security with mac-address sticky - > first frame must have a src 
mac-address ( or if there will be many you will have logs )
bpduguard enable -> if it's a switch ( with spanning-tree enabled ) you 
will have the port on err-disable
Any cdp info ?

Dan
Dale Shaw wrote:
> Hi all,
>
> Here's the scenario:
>
> - L2 switchport in cat3750 "up/up"
> - No MAC learnt on the interface ("sh mac-addr int gi1/0/4" shows no
> dynamic MAC address)
> - Attached device not necessarily configured with an IP in the correct
> VLAN (mismatched with switchport) - endpoint IP configuration unknown
>
> I haven't really given this much consideration, but does anyone know
> of any tricks, ideally executed _from_ the switch, to encourage the
> attached device to spit back a frame? Essentially I want/need to
> figure out what's attached. Even knowing the MAC vendor would help.
>
> Other suggestions are welcome. I guess I could try things like a
> broadcast ping from a host in the same VLAN, make the port a trunk and
> madly ping sweep, but something more elegant would be nice.
>
> A physical inspection, in this case, is not possible.
>
> cheers,
> Dale
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