If the switch has SFP modules, the numbering of these ports depends on the type of other interfaces on the switch. If the port type changes from Fast Ethernet to Gigabit Ethernet (SFP), the port numbers begin again from 1; if the port type remains Gigabit Ethernet, the port numbers continue consecutively

•To configure the first SFP module port on stack member 1 with 24 10/100/1000 ports, enter this command:
Switch(config)# interface gigabitethernet1/0/25
•To configure the first SFP module port on stack member 1 with 24 10/100 ports, enter this command:
Switch(config)# interface gigabitethernet1/0/1

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