Perform this procedure to manually enable Auto-sense on a specific port.
Note
After a switch boots without a configuration file, Auto-sense is enabled on all ports, by default.
enable
configure terminal
interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...]}
Note
If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.
auto-sense enable
Enabling Auto-sense on port 1/2:
Switch:1>enable Switch:1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch:1(config)#interface gigabitEthernet 1/2 Switch:1(config-if)#auto-sense enable Warning: Enabling Auto-Sense will default port configurations.