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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter8 Configuring Interface Cha rac teristics Using the Interface Command
To configure a physical interface (port), enter interface configuration mode, and specify the interface type,
slot, and number.
•Type—Fast Ethernet (fastethernet or fa) for 10/100 Ethernet or Gigabit Ethernet (gigabitethernet or
gi)
•Slot—The slot number on the switch. On the Catalyst 3550 switch, the slot number is 0.
•Port number—The interface number on the switch. The port numb ers always begin at 1, starting at
the left when facing the front of the switch, for example, gigabitethe rnet 0/1, gigabitethernet 0/2. If
there is more than one media type (for example, 10/1 00 port s a nd Gig abit Et hern et po rts) , the por t
number starts again with the second media: fastethernet0 /1, fas tethe rnet0 /2.
You can identify physical interfaces by physically checking the interface locati on on the switch. You can
also use the IOS show privileged EXEC commands to displ a y information about a specific interface or
all the interfaces on the switch. The remainder of this chapter primarily provides physical interface
configuration procedures.
Procedures for Configuring Interfaces
These general instructions apply to all interface configuration processes.
Step 1 Enter the configure terminal command at the privileged EXEC prompt:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#
Step 2 Enter the interface global configuration command. Identif y the i nter fa ce ty pe a nd th e n umb er o f th e
connector. In this example, Gigabit Ethernet interface 0/1 is selected:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)#
Note You do not need to add a space between the interface type and interface number. For example,
in the preceding line, you can specify either gigabitethernet 0/1 , gigabitethernet0/1, gi 0/1,
or gi0/1.
Step 3 Follow each interface command with the interface configuration commands your particular interface
requires. The commands you enter define the protocols and a pplic ati ons tha t w il l ru n o n th e int erfa ce.
The commands are collected and applied to the interface when you enter another interface command or
enter end to return to privileged EXEC mode.
You can also configure a range of interfaces by using the interface range or interface range macro
global configuration commands. Interfaces configured in a range must be the same t ype and must be
configured with the same feature options.
Step 4 After you configure an interface, verify its status by using the show privileged EXEC comma nds l isted
in the “Monitoring and Maintaining the Layer 2 Interface” section on page 8-18.