basic configurations on router

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CCNATehran Institute of Technology

Course name: Cisco CCNA Instructor: Mansour.nch ; +989356589590Senior @ Tehran Institute of TechnologyCopyright 2014

mailto:[email protected]?subject=Study%20Feedback

Course name: Cisco CCNA Instructor: Mansour.nch Senior @ Tehran Institute of TechnologyCopyright 2014

Tehran Institute of Technology

Contents

1. Managing name & Desc.

2. Managing Passwords

3. Console,Interface,Serial Advanced conf.

4. Fundamentals of Routing

Managing name & Descriptions

Note: Privileged Exec mode Required.

Change hostname– R1>enable– R1#configure terminal– Enter configuration commands, one per line. End with CNTL/Z.– R1(config)#hostname Router1– Router1(config)#

Message of the Day– Router>enable– Router#configure terminal– Enter configuration commands, one per line. End with CNTL/Z.– Router(config)#banner motd # Welcome to My Router1 ##– Router(config)#exit– Router#copy running-config startup-config– Destination filename [startup-config]? – Building configuration...– [OK]



Passwords and Authentication

Passwords

B

E

C

D

AEnable

Password

Secret

Password

AUX Password

Console

PasswordsTelnet

Password



Password Configurations

Enable Password

– This password needed when you want to switch between user mode and privileged mode

– Router>enable– Router#configure terminal– Enter configuration commands, one per line. End with CNTL/Z.– Router(config)#enable password $a12345

Note that this password saved in clear text mode, so you can have a look on this password using “show run” command.“Show run” is synonyms for “Show Running-Config” Command in Privileged Mode.

-- Router#show run OR

-- Router# Show Running-Config




Secret Password

– That’s similar to Enable Password , the difference between these codes are encryption of Secret Password.

– Router>enable– Router#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.– Router(config)#enable Secret $a12345

– Note that when “secret password” enabled the “enable password” will be disabled.So when you want to switch between privileged mode and user mode you must enter

Secret password for authentication.

You can have a look on secret password using “show config” mode , as you can see the password are encrypted!




Telnet Password

– Global Mode Required

– Telnet Configuration Required


Enter configuration commands, one per line. End with CNTL/Z.– Router(config)#line vty 0 4– Router(config-line)#login (means: Password required when telnet acknowledged)– Router(config-line)#no login (means: Password not needed when telnet acknowledged)– Router(config-line)#password $a12345




AUX Password

– Global Mode required

– AUX Line configuration required

– Router Device must have AUX port physically


Enter configuration commands, one per line. End with CNTL/Z.– Router(config)#line aux 0– Router(config-line)#login (means: Password required when AUX acknowledged)– Router(config-line)#no login (means: Password not needed when AUX acknowledged)– Router(config-line)#password $a12345




Console Password


Enter configuration commands, one per line. End with CNTL/Z.– Router(config)#line console 0– Router(config-line)#login

% Login disabled on line 0, until 'password' is set– Router(config-line)#password $a12345– Router(config-line)#



Console Extra Configurations

If we don’t define console connection Timeout, the connection will be lost after10 minutes intentionally , so we can reconfigure it.

– Router>enable– Router#configure terminal– Router(config)#line console 0– Router(config-line)#exec-timeout 0 0 (means: timeout period is unlimited)– Router(config-line)#exec-timeout 25 (means: timeout period is 25 minutes)



Interface mode Extra Configurations

To begin, here's what Interface Configuration Mode looks like in the Cisco IOS:

Router#Configure Terminal

Router(Config)#interface fastethernet0/0

Router(config-if)#

Alternatively, you can configure a group of

interfaces at the same time by using

the interface range command:

Router(config)#interface range fastethernet0/0 - 1

Router(config-if-range)#




Shutdown By default, a Cisco router or switch shuts down all ports, meaning the

ports aren't operational. However, this is different from a device such as a Linksys router; by default, all ports of one of these devices are operational when you turn on the device.

To enable ports for use, you can use the no shutdown command.

» Router(config-if-range)#no shutdown

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface

FastEthernet0/0, changed state to up

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

» Router(config-if-range)#




IP Address To put an IP address on a port, use the ip address command. When using

this command, you must provide the IP address and subnet mask.

Router(config)#interface fastethernet0/0

Router(config-if)#ip address 10.10.10.1 255.0.0.0

Alternatively, you can make the port broadcast and request a DHCP

IP address by using the following command:

Router(config-if)#ip address dhcp




Interface Description

Router>enable Router#show running-config (look at interface full name) Router#configure terminal Router(config)#interface fastethernet0/0 Router(config-if)#description Language Dep, LAN

By adding details using the description command, anyone working on the router will know, which saves time and could even prevent outages.

Router(config-if)#description Gateway to Internet circuit configured by MFT call +98 -421 - 222 - 4747 for Support

Test above command Result using “ Router# show Running-config “




duplex and speed

setting an Ethernet port to 100Mb Full duplex

Router(config-if)#speed 100

Router(config-if)#duplex full



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Connecting two Routers @ Point-to-Point

Clock Rate and Bandwidth Scenario

Course name: Cisco CCNA

Instructor: Mansour.nch

Senior @ Tehran Institute of Technology

Copyright 2014

Connection Methods

Back to Back

in this scenario routers are

in the same location,

maximum distance = 3 – 4

meters.

Connection

Methods

Different

Geography

in this scenario routers

located @ far away from

each other , this distance is

a Geography Distance



Back to Back Method

Configurations:

one Router act as DTE and another one act as a DCE.

first of all use Router#show Running-Config to see what the serial

port full name? if serial port doesn’t exist you must add it physically.

if exist follow these steps:

Router(config)#interface serial0/0/0

Router(config-if)#clock rate 64000

Router(config-if)#BandWidth 64 (Mbps ; too important in routing protocols)



In a different Geography

This is Done by CSU/DSU Modem , when we are using communication infrastructure in a country this device configure parameters automatically for the best connectivity, so CSU/DSU modem is the best solution for this scenario.



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basic configurations on router

Technology

a12345 routerconfigline

terminal routerconfig

unlimited routerconfigline

line aux

line console

aux line configuration

encryption of secret

line vty