Cisco 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
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.
Routing Protocol Configurations
To configure routing protocols such as RIP and IGRP, use the prompt (config-router)#:
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#router rip
Router(config-router)#
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