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Finding Host Connected To 2960 Switch

Are there a set of commands that be used to determine the host that is sttached to a particular port in the switch? for example I wish to know the host that is attached to port 18.

Thanks

2 REPLIES

Re: Finding Host Connected To 2960 Switch

Hi,

If you want know the mac-address of the host attached to port 18 you may use the command:

show mac address-table interface gigabitethernet0/18

I hope this helps.

Best regards.

Massimiliano.

Re: Finding Host Connected To 2960 Switch

You will need to find the MAC that was learned on the port.

show mac-address interface fa0/18

On the device that provides the layer 3 for that VLAN, ping the broadcast address, then do a show arp | inc [the learned MAC]. That will provide the IP address.

Hope that helps.

Example-

ABC-SAL-16-1#sh mac-add interface gi0/1

Mac Address Table

-------------------------------------------

Vlan Mac Address Type Ports

---- ----------- -------- -----

616 00a0.b816.09f9 DYNAMIC Gi0/1

ABC-SDL-34-1#ping 10.10.16.255

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.16.255, timeout is 2 seconds:

Reply to request 0 from 10.10.16.252, 24 ms

Reply to request 0 from 10.10.16.243, 24 ms

Reply to request 0 from 10.10.16.242, 24 ms

Reply to request 0 from 10.10.16.241, 24 ms

Reply to request 0 from 10.10.16.240, 24 ms

Reply to request 1 from 10.10.16.243, 1 ms

Reply to request 1 from 10.10.16.252, 1 ms

Reply to request 1 from 10.10.16.241, 1 ms

Reply to request 1 from 10.10.16.240, 1 ms

RKB-SDL-34-1#sh arp | inc 00a0.b816.09f9

Internet 10.10.16.240 0 00a0.b816.09f9 ARPA Vlan616

I'm assuming once you know the IP, you can figure out the hostname/netbios name/etc.

Hope that helps

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