Cisco IOS Router Instrukcja Użytkownika Pobierz pdf (Strona 11)

The Cisco IOS v1.22 – Aaron Balchunas

* * *

Aaron Balchunas (aaron@routeralley.com),

This material may be copied and used freely, but may not be altered or sold without the expressed written

consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.

Router Interfaces

Recall that, to configure an interface, one must specify both the type of

interface, and the interface number (which always begins at “0”). Thus, to

configure the first Ethernet interface on a router:

Router(config)# interface ethernet 0

Router(config-if)#

Certain router families (such as the 3600 series) are modular, and have

multiple “slots” for interfaces. All commands must reflect both the module

number and the interface number, formatted as: module/interface

Thus, to configure the third Fast Ethernet interface off of the first module:

Router(config)# interface fastethernet 0/2

Router(config-if)#

By default, all router interfaces are administratively shutdown. To take an

interface out of an administratively shutdown state:

Router(config)# interface fa 0/0

Router(config-if)# no shutdown

Notice the use of fa as a shortcut for fastethernet in the above example. To

manually force an interface into a shutdown state:

Router(config-if)# shutdown

To assign an IP address to an interface:

Router(config-if)# ip address 192.168.1.1 255.255.255.0

An additional secondary IP Address can be assigned to an interface:

Router(config-if)# ip address 192.168.1.1 255.255.255.0

Router(config-if)# ip address 192.168.1.2 255.255.255.0 secondary

Serial interfaces require special consideration. The DCE (Data

Communication Equipment) side of a serial connection must set the speed,

or clock rate, for the DTE (Data Terminal Equipment) side. Clock rate is

measured in BPS (bits-per-second).

To set the clock rate, if you are the DCE side of a serial connection:

Router(config)# interface serial 0

Router(config-if)# clock rate 64000

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Cisco IOS Router Instrukcja Użytkownika Strona 11