I am home on vacation. Before leaving, we created a new VLAN and moved 2 servers into that VLAN. I forgot to move the 3rd server in! My problem is that I know the IP and name of the server, but not what port it is plugged into (a 3560G switch). Is there anyway to ask the switch "what port is 192.168.1.x in?" or "what port is server BIGRED in?" Or any way to tell by looking at counters or cache or traceroutes? Once I know the port it will be trivial to do a "swicthport access vlan 10" and everyone will be able to hit that server again! I am desperately trying NOT to go in to work! Thanks.
If you know the mac address of the server you can query the switch with the "show mac address-table H.H.H" where H.H.H is the 48-bit MAC address.
If that doesn't work for you, you could run the command "show mac address-table interface x/x" for each port on the switch, determine the mac associated with the port and then check for an arp entry in your router with the "sh ip arp | include H.H.H" where H.H.H is the mac associated with each port.
It's not perfect, but if there is a port with a mac address and no arp entry it may be your server.
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