If you have just an IP address you need to go onto the device that has the layer 3 interface for the subnet of that ip address and look at the arp table eg.
PC = 192.168.5.10 vlan10
Lgo onto the switch with the vlan 10 L3 interface on it and run
"sh arp | include 192.168.5.10"
This will give you the mac-address of the PC. You can then run
sh mac-address-table address "xxxx.xxxx.xxxx" (IOS)
sh cam xx-xx-xx-xx-xx-xx (Catos)
Note that the above command(s) may well return a port that is connected to anothe switch (most likely a trunk). You would then need to log onto the switch at the other end of the link and run the mac-address commands again.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...