Command-Line Interface
197
Loopback Loopback interface
Multilink Multilink-group interface
Null Null interface
Port-channel Ethernet Channel of interfaces
Tunnel Tunnel interface
Virtual-Template Virtual Template interface
Virtual-TokenRing Virtual TokenRing
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 would be
nice if it also gave you an indication of what interface you were configuring?
Well, at least for now we'll have to live without it because it doesn't. (Could
this be one of the reasons Cisco administrators make more money than Win-
dows administrators? Or is it just that we're smarter?) 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)#. (You can read more
about subinterfaces in Chapters 8 and 10, but don't skip ahead just yet!)
Router(config)#int f0/0.?
<0-4294967295> FastEthernet interface number
Router(config)#int f0/0.1
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 ?
<0-4> First Line number
aux Auxiliary line
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