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Chapter 4

Introduction to the Cisco IOS and SDM

Router and Switch Administrative

Configurations

Even though this section isn’t critical to making a router or switch work on a network, it’s still

really important; in it, I’m going to lead you through configuring commands that will help you

administer your network.

The administrative functions that you can configure on a router and switch are as follows:

Hostnames

Banners

Passwords

Interface descriptions

Remember, none of these will make your routers or switches work better or faster, but trust

me, your life will be a whole lot better if you just take the time to set these configurations on each

of your network devices. That’s because doing this makes troubleshooting and maintaining your

network sooooo much easier—seriously! In this next section, I’ll be demonstrating commands

on a Cisco router, but these commands are exactly the same on a Cisco switch.

Hostnames

You can set the identity of the router with the hostname command. This is only locally sig-

nificant, which means that it has no bearing on how the router performs name lookups or

how the router works on the internetwork. However, I’ll use the hostname in Chapter 10

for authentication purposes when I discuss PPP (Point-to-Point Protocol).

Here’s an example:

yourname#config t

Enter configuration commands, one per line. End with

CNTL/Z.

yourname(config)#hostname Todd

Todd(config)#hostname Atlanta

Atlanta(config)#hostname Todd

Todd(config)#

Even though it’s pretty tempting to configure the hostname after your own name, it’s defi-

nitely a better idea to name the router something pertinent to the location. This is because giving

it a hostname that’s somehow relevant to where the device actually lives will make finding it a

whole lot easier. And it also helps you confirm that you are, indeed, configuring the right device.

For this chapter, we’ll leave it at Todd for now.

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