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Configuring Router: Interface Setup, Passwords, Show Commands, and Host Tables, Slides of Computer Networks

Chhattisgarh Swami Vivekanand Technical UniversityComputer Networks

Instructions for university students in semester 2, module 3, on configuring a router. Topics include naming a router, setting passwords, examining show commands, configuring serial and ethernet interfaces, executing changes, saving changes, configuring interface descriptions, and understanding the importance of backups and documentation. The document also covers router modes, basic setup, show commands, configuring a serial interface, making config changes, configuring an ethernet interface, configuration standards, interface descriptions, configuring an interface description, login banners, configuring a message-of-the-day (motd), host name resolution, and configuring host tables.

Typology: Slides

2011/2012

Uploaded on 11/09/2012

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Configuring a Router
Semester 2 – Module 3
Module Objectives:
Name a router
Set passwords
Examine show commands
Configure a serial interface
Configure an Ethernet interface
Execute changes to a router
Save changes to a router
Configure an interface description
Configure a message-of-the-day banner
Configure host tables
Understand the importance of backups and documentation
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Download Configuring Router: Interface Setup, Passwords, Show Commands, and Host Tables and more Slides Computer Networks in PDF only on Docsity!

Configuring a Router

Semester 2 – Module 3

Module Objectives:

 Name a router

 Set passwords

 Examine show commands

 Configure a serial interface

 Configure an Ethernet interface

 Execute changes to a router

 Save changes to a router

 Configure an interface description

 Configure a message-of-the-day banner

 Configure host tables

 Understand the importance of backups and documentation Docsity.com

Router Modes

Show Commands

  • show interfaces – Displays statistics for all interfaces on a router
    • Router# show interfaces serial 0/
  • show hosts - Displays a cached list of host names and addresses
  • show users - Displays all users who are connected to the router
  • show history - Displays a history of commands that have been entered
  • show flash - Displays information about flash memory and what IOS files are stored there
  • show version - Displays information about the currently loaded software version along with hardware and device information.
  • show arp - Displays the ARP table of the router
  • show protocols - Displays the global and interface-specific status of any configured Layer 3 protocols
  • show startup-config - Displays the saved configuration located in NVRAM
  • show running-config - Displays the contents of the currently running configuration file or the configuration for a specific interface, or map class information.

Configuring a Serial Interface

  • To configure a serial interface follow these steps:
    • Enter global configuration mode.
    • Enter interface mode.
      • Router(config)# interface serial 0/
    • 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.

  • Router(config-if)# clock rate 56000
  • Turn on the interface.
  • Router(config-if)# no shutdown

Configuring an Ethernet Interface

  • To configure an Ethernet interface follow

these steps:

  • Enter global configuration mode.
  • Enter interface configuration mode.
    • Router(config)# interface e
  • Specify the interface address and subnet mask.
    • Router(config-if)# ip address nnn.nnn.nnn.hhh sss.sss.sss.sss
  • Enable the interface.
    • Router(config-if)# no shutdown

Configuration Standards

  • used to control of the number of

configuration files that must be maintained

  • how the files are stored
  • where the files are stored
  • The creation of standards for network

consistency helps reduce:

  • network complexity
  • unplanned downtime
  • events that may affect network performance.

Configuring an INT Description

  • The steps to configure an interface description are as

follows:

  • Use the configure terminal command to enter global

configuration mode.

  • Enter a specific interface mode such as interface ethernet 0.
  • Enter the command description followed by the information that

is to be displayed, such as XYZ Network, Building 18.

  • Use Ctrl-Z to exit interface mode and return to privileged EXEC

mode.

  • Use the copy running-config startup-config command to save

the configuration changes to NVRAM.

  • Example
    • interface ethernet 0
    • description LAN Engineering, Bldg.

Login Banners

  • a message that is displayed at login
  • can be seen by anyone
  • should warn users not to attempt login

unless they are authorize

  • can be used to convey messages that

affect all network users, such as

scheduled system shutdowns

Host Name Resolution

  • the process that a computer system uses

to associate a host name with an IP

address

  • Host Table Created
  • Host names, unlike DNS names, are

significant only on the router on which they

are configured

Configuring Host Tables

  • The procedure to configure a host table is as

follows:

  • Enter global configuration mode.
  • Enter the ip host command followed by the name of

the router and all IP addresses associated with the

router interfaces.

  • Repeat Step 2 until all routers in the network are

entered.

  • Save the configuration to NVRAM.
  • Viewing Host Table
  • Router# Show Hosts

Backup Config Commands

  • Backing Up to TFTP
    • Enter the copy running-config tftp

command.

  • Enter the IP address of the host where the

configuration file will be stored.

  • Enter the name to assign to the

configuration file.

  • Answer yes to confirm each choice.