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Chapter 4

Introduction to the Cisco IOS and SDM

Overview of Router Modes

To configure from a CLI, you can make global changes to the router by typing configure

terminal (or config t for short), which puts you in global configuration mode and changes

what’s known as the running-config. A global command (a command run from global config)

is set only once and affects the entire router.

You can type config from the privileged-mode prompt and then just press Enter to take

the default of terminal, as seen here:

yourname#config

Configuring from terminal, memory, or network [terminal]? [press enter]

Enter configuration commands, one per line. End with CNTL/Z.

yourname(config)#

At this point, you make changes that affect the router as a whole (globally), hence the term

global configuration mode. To change the running-config—the current configuration running in

dynamic RAM (DRAM)—you use the configure terminal command, as I just demonstrated.

To change the startup-config—the configuration stored in NVRAM—you use the

configure memory command (or config mem for short), which merges the startup-config

file into the running-config file in RAM. If you want to change a router configuration stored

on a TFTP host (which is covered in Chapter 5, “Managing a Cisco Internetwork”), you use

the configure network command (or config net for short), which also merges the file

with the running-config file in RAM.

The configure terminal, configure memory, and configure network commands

are all used to configure information into RAM on a router; however, typically only the

configure terminal command is used. It is possible, though, that the commands config

mem and config net can be useful if you screw up your running-config file and don’t want

to reboot your router.

Here are some of the other options under the configure command:

yourname(config)#exit or press cntl-z

yourname#config ?

confirm Confirm replacement of running-config with

a new config file

memory Configure from NV memory

network Configure from a TFTP network host

overwrite-network Overwrite NV memory from TFTP network host

replace Replace the running-config with a new config file

terminal Configure from the terminal

<cr>

As you can see, Cisco has added a few more commands in the 12.4 IOS. We’ll go through

these commands in Chapter 5.

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