Router Interfaces
- Wednesday, November 12, 2008, 13:50
- CCNA
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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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