Chapter 4 Configuring Interfaces
General Instructions for Configuring Interfaces
Figure 4-1 Interface Port Identifier Format
slot number / subslot number / interface number
The slot in which the interface module or port adapter is installed. Slots are numbered starting at 0.
The subslot in which the interface module or port adapter is installed. For a
The port or interface number on the interface module or port adapter. Numbering always starts at 0 and goes from left to right.
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The interface port identifiers on the Ethernet modules remain the same regardless of whether other modules are installed or removed. However, when you move an interface module to a different slot, the first number in the address changes to reflect the new slot number.
You can identify module ports by physically checking the slot/subslot/interface location on the back of the switch router. You can also use Cisco IOS show commands to display information about a specific interface, or all the interfaces, in the switch router.
General Instructions for Configuring Interfaces
The following general configuration instructions apply to all interfaces. Begin in global configuration mode. To configure an interface, follow these steps:
Step 1 Use the configure EXEC command at the privileged EXEC prompt to enter the global configuration mode.
Router> enable
Router# configure terminal
Router (config)#
Step 2 Enter the interface command, followed by the interface type (for example, Fast Ethernet or Gigabit Ethernet) and its interface port identifier (see the “Interface Port Identifier” section on page
For example, to configure the Gigabit Ethernet port on slot 1, port 1, use this command:
Router(config)# interface gigabitethernet 1/0/1
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