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CCNA Semester 2

Chapter 03Chap

ter 03

CONFIGURINGCONFIGURINGA ROUTERA ROUTER

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ObjectivesObjectives

Introduces the basic configuration modes ofthe router

Provides opportunities to practice simple

configurations.

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Table of ContentTable of Content

1 Configuring a Router2 Finishing a configuration

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CONFIGURING A ROUTERCONFIGURING A ROUTER

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Overview of Router ModesOverview of Router Modes

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Configuring a Router NameConfiguring a Router Name

A router should be given a unique name as one of the

first configuration tasks.

Router(config)#hostname Tokyo

Tokyo(config)#

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Configuring Router PasswordsConfiguring Router Passwords

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Other Console-Line CommandsOther Console-Line Commands

Router(config)#line console 0Router(config-line)#exec-timeout 0 0

Router(config)#line console 0Router(config-line)#logging synchronous

Prevents console session timeout

Redisplays interrupted console input

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Examining theExamining the showshow CommandsCommands

There are many show commands that you can

use to examine the contents of files in therouter and for troubleshooting.

In both privileged EXEC and user EXEC

modes, the command show ? provides a listof available show commands.

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Interface Configuration CommandsInterface Configuration Commands

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Configuring an Ethernet InterfaceConfiguring an Ethernet Interface

To configure an Ethernet interface follow

these steps: Enter global configuration mode.

Enter interface configuration mode.

Specify the interface address and subnet

mask. Enable the interface.

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ExampleExample

Router(config)#interface ethernet 0

Router(config-if)#ip address 200.1.4.1255.255.255.0

Router(config-if)#no shutdown

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Serial Interface configuration stepSerial Interface configuration step

Enter global configuration mode

Enter interface mode Specify the interface address and subnet

mask

Set clock rate if a DCE cable is connected.Skip this step if a DTE cable is connected.

Turn on the interface

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DTE - DCEDTE - DCE

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Serial Connection in LabSerial Connection in Lab

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ExampleExample

Router(config)#interface serial 0/0

Router(config-if)#clock rate 64000Router(config-if)#no shutdown

Determine DCE interface:

show controller

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#configure terminal

(config)#interface serial 0

(config-if)#no shutdown

3-UPDOWN: Interface Seria0, changed state to upROTO-5-UPDOWN: Line Protocol on Interface Serial0, changed state to up

Enables an interface that is administratively shut down

figure terminal

fig)#interface serial 0

fig-if)#shutdown

ANGED: Interface Serial0, changed state to administratively down

-5-UPDOWN: Line protocol on Interface Serial0, changed state to down

Administratively turns off an interface

Disabling or Enabling an InterfaceDisabling or Enabling an Interface

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Configuring Interface DescriptionsConfiguring Interface Descriptions

An interface description should be used toidentify important information such as a

distant router, a circuit number, or a specific

network segment.

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Router show interfaces CommandRouter show interfaces Command

Router#show interfaces

Ethernet0 is up, line protocol is up

Hardware is Lance, address is 00e0.1e5d.ae2f (bia 00e0.1e5d.ae2f)

Internet address is 10.1.1.11/24

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255

Encapsulation ARPA, loopback not set, keepalive set (10 sec)

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:07, output 00:00:08, output hang neverLast clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

81833 packets input, 27556491 bytes, 0 no buffer

Received 42308 broadcasts, 0 runts, 0 giants, 0 throttles

1 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored, 0 abort

0 input packets with dribble condition detected

55794 packets output, 3929696 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 4 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

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Interpreting the Interface StatusInterpreting the Interface Status

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Verifying a Serial Interface ConfigurationVerifying a Serial Interface Configuration

Router#show interface serial 0

Serial0 is up, line protocol is up

Hardware is HD64570

Internet address is 10.140.4.2/24

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255

Encapsulation HDLC, loopback not set, keepalive set (10 sec)

Last input 00:00:09, output 00:00:04, output hang never

Last clearing of "show interface" counters neverInput queue: 0/75/0 (size/max/drops); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

(output omitted)

BW 64 Kbit,

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Serial Interface show controller CommandSerial Interface show controller Command

Router#show controller serial 0

HD unit 0, idb = 0x121C04, driver structure at 0x127078

buffer size 1524 HD unit 0, V.35 DTE cable.

.

.

Router#show controller serial 0

HD unit 0, idb = 0x121C04, driver structure at 0x127078

buffer size 1524 HD unit 0, V.35 DTE cable

.

.

.

Shows the cable type of serial cables

V.35 DTE Cable

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Configuring Message-of-the-Day (MOTD)Configuring Message-of-the-Day (MOTD)

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Host Name ResolutionsHost Name Resolutions

Host name resolution is the process that a

computer system uses to associate a hostname with an IP address.

Host names, unlike DNS names, are

significant only on the router on which theyare configured.

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Command:Command: ip host nameip host name

Global configuration mode.

The ip host command makes a static name-to-address entry in the router's configurationfile.

Example:# ip host LAB_A 192.168.2.1 192.168.10.1

# ip host 2323 Server_Unix 192.168.5.1

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Configuring Host TablesConfiguring Host Tables

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Command:Command: ip name-serverip name-server


Defines which hosts can provide the nameservice.

Maximum of six IP addresses as nameservers in a single command.

Any time the OS software receives a hostname it does not recognize, it refers to DNSfor the IP address of that device.

Example:

# ip name-server 192.168.20.2203.162.3.253

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Command:Command: ip name-serverip name-server


Defines which hosts can provide the nameservice.

Maximum of six IP addresses as nameservers in a single command.

Any time the OS software receives a hostname it does not recognize, it refers to DNSfor the IP address of that device.

Example:

# ip name-server 192.168.20.2203.162.3.253

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Command:Command: no ip domain-lookupno ip domain-lookup


DNS is enabled by default with a serveraddress of 255.255.255.255, which is a local

broadcast.This command turns off name-to-addresstranslation in the router. This means that therouter will not generate or forward namesystem broadcast packets.

Example:

# no ip domain-lookup

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Command:Command: show hostsshow hosts

User mode.

The show hosts command is used to displaya cached list of host names and addresses.

Example:# show hosts

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ROUTER CONFIGURATION FILESROUTER CONFIGURATION FILES

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Configuration fileConfiguration file

Contains commands to customize routeroperation.

The router uses this information when it

starts up.

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Configuration filesConfiguration files

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11.011.0 Configuration filesConfiguration files

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Pre-Pre-11.011.0 Configuration filesConfiguration files

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Configuration Backup and DocumentationConfiguration Backup and Documentation

Using theUsing the copy running-config tftpcopy running-config tftp

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Using theUsing the copy running config tftpcopy running config tftp

CommandCommand

Using theUsing the copy tftp running-configcopy tftp running-config

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Using theUsing the copy tftp running-configcopy tftp running-config

CommandCommand

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SummarySummary

The router has several modes: User EXEC mode

Privileged EXEC mode

Global configuration mode

Other configuration modes.

The basic configuration: Configure hostname

Configure password Configure interface

Configure login banner

Host name resolution

Backup and document configuration.

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Q&AQ&A

Documents

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