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182

Chapter 4

Introduction to the Cisco IOS and SDM

Connecting to a Cisco Router

You can connect to a Cisco router to configure it, verify its configuration, and check statistics.

There are different ways to do this, but most often, the first place you would connect to is the con-

sole port. The

console port

is usually an RJ-45 (8-pin modular) connection located at the back of

the router—by default, there may or may not be a password set. The new ISR routers use

cisco

as the username and

cisco

as the password by default.

See Chapter 1, “Internetworking,” for an explanation of how to configure a

PC to connect to a router console port.

You can also connect to a Cisco router through an

auxiliary port

—which is really the same

thing as a console port, so it follows that you can use it as one. But an auxiliary port also allows

you to configure modem commands so that a modem can be connected to the router. This is a

cool feature—it lets you dial up a remote router and attach to the auxiliary port if the router is

down and you need to configure it

out-of-band

(meaning out of the network).

The third way to connect to a Cisco router is in-band, through the program

Telnet

. (

In-band

means configuring the router through the network, the opposite of

out-of-band

.) Telnet is a

terminal emulation program that acts as though it’s a dumb terminal. You can use Telnet to

connect to any active interface on a router, such as an Ethernet or serial port.

Figure 4.1 shows an illustration of a 2501 Cisco router. Pay close attention to all the

different kinds of interfaces and connections.

F I G U R E 4 . 1

A Cisco 2501 router

The 2501 router has two serial interfaces, which can be used for WAN connections, and one

Attachment Unit Interface (AUI) connection for a 10Mbps Ethernet network connection. This

router also has one console and one auxiliary connection via RJ-45 connectors. The 2501 router

shown has two serial V.35 connections used for WAN connections like a T1, or Frame Relay.

Plus, next to the console port could be another RJ45 port marked as BRI (Basic Rate Interface)

that’s used with ISDN (Integrated Services Digital Network). And don’t stress—I’m going to

cover T1, Frame Relay, ISDN, and more WAN protocols coming up in Chapter 10, “Introduc-

tion to Wide Area Networks.”

Figure 4.2 shows an illustration of a Cisco 2600 series modular router, which is a cut above

routers populating the 2500 series because it has a faster processor and can handle many more

interfaces. Both the 2500 and 2600 series routers are end of life (EOL), and you can only buy

them used. However, many 2600 series routers are still found in production, so it’s important

to understand them. Pay close attention to all the different kinds of interfaces and connections.

AUI SERIAL 0 SERIAL 1 CONSOLE AUX

CISCO 2501

Input: 100-240VAC

Freq: 50.60 Hz

Current: 1.2-0.6A

Watts: 40W

47020.book Page 182 Wednesday, January 2, 2008 4:31 PM

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