if the device connected to port supports LLDP or CDP,
try "show neighbour".
#show neigh
Capability codes: (R)Router, (B)Bridge, (A)Access Point, (P)Phone, (S)Station
(r)Repeater, (O)Other
Neighbor Devices Information
----------------------------
Local Intf Chassis ID Protocol Capability Remote Intf Expiry (Secs) System Name
---------- ---------- -------- ---------- ----------- ------------- -----------
GE0/0/44 6c:f3:7f:c4:0b:5c LLDP B:A 6c:f3:7f:c4:0b:5c 108 6c:f3:7f:c4:0b:5c
GE0/0/47 00:0b:86:6a:b2:40 LLDP B:R gigabitethernet0/0/11 99 LAB-INSTANT
Number of neighbors: 2