It treats each port as a fast ethernet interface, so just log into the switch, go to interface configuration, and then do a shut. Switch>enable Switch#conf t Switch# (config)int fa 0/1 Switch# (config-int)shut This will work for most stackable cisco switches. Hope. On a cisco switch such as a catalyst 2900 & 3500 series switches, you can just shut the port down. Use the 'shutdown' command to disable the port. Ensure to check for err-disabled ports with 'show. It is common to seek technical support (Cisco Technical Support) when noticing that one or more switch ports have become error disabled, which means that the ports have a status of errdisabled.