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Command-Line Interface

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The 2522 router has one Ethernet 10BaseT port, and typing interface

ethernet

0 can configure that interface:

Router(config)#int ethernet ?

<0-0> Ethernet interface number

Router(config)#int ethernet 0

Router(config-if)#

The 2500 router, as previously demonstrated, is a fixed configuration

router, which means that when you buy that model, you're stuck with that
configuration.

To configure an interface, you always use the interface type number

sequence, but the 2600, 3600, 4000, and 7000 series routers use a physical
slot in the router, with a port number on the module plugged into that slot.
For example, on a 2600 router, the configuration would be interface type
slot/port

Router(config)#int fastethernet ?

<0-1> FastEthernet interface number

Router(config)#int fastethernet 0

% Incomplete command.

Router(config)#int fastethernet 0?

Router(config)#int fastethernet 0/?

<0-1> FastEthernet interface number

And make note of the fact that you can't just type int fastethernet 0.

You must type the full command--type slot/port, or int fastethernet
0/0

, or int fa 0/0.

To set the type of connector used, use the media-type command. This is

usually auto-detected:

Router(config)#int fa 0/0

Router(config-if)#media-type ?

100BaseX Use RJ45 for -TX; SC FO for -FX

MII Use MII connector

Bringing Up an Interface

You can turn an interface off with the interface command shutdown, and
turn it on with the no shutdown command. If an interface is shut down, it'll
display administratively down when using the show interface command.

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