Router Interfaces

Interfaces

To make changes to an interface, you use the interface command from global configuration mode:
Router(config)#interface ?
Async    Async interface
BVI    Bridge-Group Virtual Interface
CTunnel    CTunnel interface
Dialer    Dialer interface
FastEthernet    FastEthernet IEEE 802.3
Group-Async    Async Group interface
Lex    Lex interface
Loopback    Loopback interface
MFR    Multilink Frame Relay bundle interface
158

Multilink
Null Serial Tunnel Vif Virtual-Template Virtual-TokenRing range
Multilink-group interface Null interface Serial
Tunnel interface
PGM Multicast Host interface Virtual Template interface Virtual TokenRing interface range command
Router(config)#interface fastethernet 0/0

Router(config-if)#
Did you notice the prompt changed to Router(config-if)#? This tells you that you’re in interface configuration mode. And wouldn’t it be nice if the prompt also gave you an indication of what interface you were configuring? Well, at least for now we’ll have to live without the prompt information because it doesn’t. (Could this be one of the reasons Cisco administrators make more money than Windows administrators? Or is it just that we’re smarter and better looking?) One thing is for sure: You really have to pay attention when configuring a router!

Subinterfaces
Subinterfaces allow you to create logical interfaces within the router. The prompt then changes to

Router(config-subif)#:
Router(config)#int fastethernet0/0.? <0-4294967295> FastEthernet interface number

Router(config)#int fastethernet0/0.1
Router(config-subif)#

Line Commands
To configure user-mode passwords, use the line command. The prompt then becomes

Router(config-line)#:
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#line ?
<0-70> First Line number
aux    Auxiliary line
Command-Line Interface    159
console Primary terminal line tty    Terminal controller
vty    Virtual terminal
x/y    Slot/Port for Modems

2600A(config)#line

Router(config)#line console 0

Router(config-line)#
The line console 0 command is known as a major command (also called a global command), and any command typed from the (config-line) prompt is known as a subcommand.

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