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Routers and Routing Basics CCNA 2

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Routers and Routing Basics CCNA 2 Chapter 3 1 Configuring a Router Configuring a Router for Basic Routing Reviewing the Configuration Modes Configuring Ethernet and ... – PowerPoint PPT presentation

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Title: Routers and Routing Basics CCNA 2


1
Routers and Routing Basics CCNA 2
Chapter 3
1
2
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

2
3
Configuring a Router for Basic Routing
  • Internetwork with Two Routers
  • Used in Basic Router Configuration

3
4
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.

4
5
Router Configuration Modes and Command Prompts
5
6
Configuring Ethernet and Serial Interfaces
6
7
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.

7
8
Configuring Routes
Routing Tables on Routers R1 and R2Connected
Routes Only
8
9
Configuring Routes (Continued)
Routing Tables on Routers R1 and R2Connected
Routes Only
9
10
Summarizing the Working Configurations for R1 and
R2
10
11
Configuring a Routers Hostname
11
12
User and Enable Mode Passwords
Console, Aux, VTY, and Enable Passwords
12
13
Configuring Console, Aux, and VTY Passwords
13
14
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.

14
15
Examining Operational Status Using show Commands
15
16
Examining Operational Status Using show Commands
(Continued)
16
17
Examining Operational Status Using show Commands
(Continued)
17
18
Popular show commands
18
19
Popular show commands (Continued)
19
20
Changing the Configuration
What to Do if the Configuration Is Incorrect
  • After configuration changes have been made, you
    should look at the running configuration using
    the show running-config command.
  • For the simple changes reenter the command in the
    correct configuration mode.
  • 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.

20
21
Changing the Configuration (Continued)
21
22
Changing the Configuration (Continued)
22
23
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
    startup-config command and then reloading the
    router.
  • Use copy startup-config running-config command or
    the copy tftp running-config 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.

23
24
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.

24
25
Configuring Interface Descriptions
25
26
Configuring Interface Descriptions (Continued)
26
27
Configuring Login Banners
27
28
Configuring Local Host Tables
28
29
Configuring Local Host Tables (Continued)
29
30
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

30
31
Copying to TFTP Server
31
32
Copying from TFTP Server
32
33
Where to Keep the Backup Configuration Files
  • Three places in which you might want
  • to save the configuration files
  • A TFTP server
  • A network (file) server
  • A disk in a safe place

33
34
Command Summary for Copying and Looking at
Configuration Files
34
35
Configuration Command Summary
35
36
Configuration Command Summary (Continued)
36
37
Configuration Command Summary (Continued)
37
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