Transcript Integrating Cisco Press Resources into the Academy Classroom

Routers and Routing Basics CCNA 2
Chapter 3
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Configuring a Router
Configuring a Router for Basic Routing
Reviewing the Configuration Modes
Configuring Ethernet and Serial Interfaces
Configuring Hostnames and Passwords
Examining Operational Status Using show Commands
Changing the Configuration
Documenting the Router Configuration
Configuring Interface Descriptions
Configuring Login Banners
Configuring Local Host Tables
Backing Up the Configuration
Summary
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Configuring a Router for Basic Routing
Internetwork with Two Routers
Used in Basic Router Configuration
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Reviewing the Configuration Modes
Step 1 The user logs in from the console, moves to enable mode, and then enters
configuration mode by using the configure terminal privileged mode EXEC command.
Step 2 The user changes the hostname using the hostname fred global configuration
command.
Step 3 The user incorrectly tries to use the ip address 172.16.1.251 255.255.255.0
command. This command is an interface mode subcommand that must be issued from
interface mode.
Step 4 The user moves to interface configuration mode using the interface
Fastethernet 0/0 command and then correctly uses the ip address interface
subcommand.
Step 5 The user presses Ctrl-z to exit configuration mode, moving back to enable mode.
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Router Configuration Modes and Command
Prompts
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Configuring Ethernet and Serial Interfaces
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Configuring Clock Rate on a Serial Link
•
Clock rate command includes the speed in bits per second (bps), but a
Router supports only specific speeds like 1200, 2400, 9600, 19,200, 38,400,
56,000, 64,000, 72,000, 125,000, 148,000, 500,000, 800,000, 100,0000,
1,300,000, 2,000,000, or 4,000,000 bps.
– It is set only on the DCE router
•
Routers do not allow just any speed.
•
For example, the clock rate 64000 command would be accepted, but the
clock rate 65000 command would be rejected.
•
To find the speeds supported on a particular type of router, use the clock
rate ? command in serial interface configuration mode.
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Configuring Routes
Routing Tables on Routers R1 and R2—Connected Routes Only
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Configuring Routes
(Continued)
Routing Tables on Routers R1 and R2—Connected Routes Only
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Summarizing the Working Configurations for
R1 and R2
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Configuring a Router’s Hostname
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User and Enable Mode Passwords
Console, Aux, VTY, and Enable Passwords
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Configuring Console, Aux, and VTY
Passwords
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Two commands that can define the enable
password
• If only one of the two commands (enable secret or enable
password) is configured, but not both, IOS expects the user to enter
the password as defined in that single configuration command.
• If both the enable secret and enable password commands are
configured, the router expects the password as defined in the
enable secret command. The router will not accept the password
defined in the enable password command.
• If neither the enable secret nor enable password command is
configured, the behavior varies. If the user is at the console, the
router automatically allows the user access to enable mode. If the
user is not at the console, the router rejects the enable command.
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Examining Operational Status Using
show Commands
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Examining Operational Status Using show
Commands (Continued)
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Examining Operational Status Using show
Commands (Continued)
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Popular show commands
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Popular show commands
(Continued)
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Changing the Configuration
What to Do if the Configuration Is Incorrect
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After configuration changes have been made, you
should look at the running configuration using the
show running-config command.
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For the simple changes reenter the command in the
correct configuration mode.
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If a command was configured but was not needed, get
into the same configuration mode and issue the same
command prefaced by the word no.
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Changing the Configuration
(Continued)
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Changing the Configuration
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Changing the Configuration
(Continued)
•
To remove the password and login commands from the console line, use the word
no in front.
–
–
–
Router1(config-if)#Line con 0
Router1(config-line)#no password height
Router1(config-line)#no login
•
Start over completely by erasing the startup-config file using the erase startupconfig command and then reloading the router.
•
Use copy startup-config running-config command or the copy tftp runningconfig command to copy the configuration file from a TFTP server, respectively, into
the running-config file.
•
Copy running-config startup-config command should be used to save a copy of
the new configuration in the startup-config file in NVRAM.
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Documenting the Router Configuration
• The network should be well documented by the network
engineers.
• Engineers should define a standard for their
internetworks about how the routers (and switches) are
configured.
• The creation of standards for network consistency helps
reduce network complexity, unplanned downtime, and
events that may affect network performance.
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Configuring Interface Descriptions
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Configuring Interface Descriptions
(Continued)
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Configuring Login Banners
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Configuring Local Host Tables
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Configuring Local Host Tables
(Continued)
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Backing Up the Configuration
Movement of files using
the copy command
between tree locations:
• The running configuration
file in RAM
• The startup configuration
file in NVRAM
• A TFTP server in the
network
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Copying to TFTP Server
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Copying from TFTP Server
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Where to Keep the Backup Configuration
Files
Three places in which you might want
to save the configuration files:
1. A TFTP server
2. A network (file) server
3. A disk in a safe place
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Command Summary for Copying and
Looking at Configuration Files
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Configuration Command Summary
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Configuration Command Summary
(Continued)
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Configuration Command Summary
(Continued)
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