Cisco 2501 - Router - EN Bedienungsanleitung PDF herunterladen (Seite 40)

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Chapter 4

Introduction to the Cisco IOS and SDM

Configuring an IP Address on an Interface

Even though you don’t have to use IP on your routers, it’s most often what people actually do

use. To configure IP addresses on an interface, use the ip address command from interface

configuration mode:

Todd(config)#int f0/1

Todd(config-if)#ip address 172.16.10.2 255.255.255.0

Don’t forget to enable the interface with the no shutdown command. Remember to look

at the command show interface int to see if the interface is administratively shut down or

not. show running-config will also give you this information.

The ip address address mask command starts the IP processing on the

interface.

If you want to add a second subnet address to an interface, you have to use the secondary

parameter. If you type another IP address and press Enter, it will replace the existing IP address

and mask. This is definitely a most excellent feature of the Cisco IOS.

So let’s try it. To add a secondary IP address, just use the secondary parameter:

Todd(config-if)#ip address 172.16.20.2 255.255.255.0 ?

secondary Make this IP address a secondary address

<cr>

Todd(config-if)#ip address 172.16.20.2 255.255.255.0 secondary

Todd(config-if)#^Z

Todd(config-if)#do sh run

Building configuration...

[output cut]

interface FastEthernet0/1

ip address 172.16.20.2 255.255.255.0 secondary

ip address 172.16.10.2 255.255.255.0

duplex auto

speed auto

I really wouldn’t recommend having multiple IP addresses on an interface because it’s ugly

and inefficient, but I showed you anyway just in case you someday find yourself dealing with

an MIS manager who’s in love with really bad network design and makes you administer it!

And who knows? Maybe someone will ask you about it someday and you’ll get to seem really

smart because you know this.

47020.book Page 218 Wednesday, January 2, 2008 4:31 PM

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Cisco 2501 - Router - EN Bedienungsanleitung Seite 40