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Configuring a Router

This module covers important tasks such as naming a router, setting passwords, configuring interfaces, understanding show commands, and the significance of backups and documentation. Learn to configure Ethernet and serial interfaces, execute changes effectively, and save configurations. Explore how to configure interface descriptions, host tables, and a message-of-the-day banner. Understand the importance of router modes, including Global Config mode and Privileged EXEC mode. Discover how to set passwords for better security and manage various show commands effectively. This module also covers configuring host tables, backups, and restoring configuration files. Gain insights into changing router configurations and adhering to configuration standards. Enhance your router management skills with this comprehensive guide.

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Configuring a Router

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  1. Configuring a Router Module 3 Semester 2

  2. Router Configuration Tasks • 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

  3. Router Modes • All configuration changes are made from Global Config mode • Ctrl-Z or end • returns to Privileged EXEC mode • exit • Go back one step

  4. Configure Hostname • Required if name resolution is to be used • Not essential for the functioning of our routers but is important

  5. Configuring passwords • An important feature • security • telnet (vty) will not work without a password set • Line console 0 • sets login password for User EXEC mode • Enable password xxx • sets login password for Privileged EXEC mode • Enable secret • sets encrypted password for Privileged EXEC mode • (strong encryption)

  6. show interfaces – Displays statistics for all interfaces on a router. Router#show interfaces serial 0/1 show controllers serial - Displays information that is specific to the interface hardware. This command must also include the port or slot/port number of the serial interface. Router#show controllers serial 0/1 show clock - Shows the time set in the router 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 Show Commands

  7. Configuring an interface

  8. Configuring an Ethernet Interface

  9. Fast Ethernet Interface Router(config)# interface fastethernet 0/0 Router(config-if)# ip address 190.100.11.1 255.255.255.0 Router(config-if)# no shutdown Serial Interface (DCE) (no clock for DTE) Router(config)# interface serial 0/0 Router(config-if)# ip address 190.100.10.2 255.255.255.0 Router(config-if)# clock rate 56000 Router(config-if)# no shutdown Configuring a Serial Interface

  10. Configuring Interface Descriptions An interface description should identify important information such as a router, a circuit number, or a specific network segment.

  11. The Login Banner • The Banner is seen when someone attempts to login • Important to let user know it is a private system

  12. Login Banner MOTD • Configured from Global Config mode • Use the Banner MOTD command • Use delimiters (#) to indicate start and end of message

  13. Host Name Resolution • Two Choices • DNS • Dynamic • (not available in our lab) • Hosts Table • Static entries • Used in our lab situation

  14. Configuring Hosts Tables • The Host table contains: • Name • IP address of each router in the network • The host name in a command will be resolved to an IP address if the name is found in the table • i.e. ping Auckland • is translated to ping 172.16.32.1 (if the hosts below entered) • Host tables only apply to the the local router

  15. The copy running-config tftp Command Backing up Configuration Files

  16. The copy tftp running-config Command Restoring Configuration Files from a TFTP Server

  17. Changing Router Configuration

  18. Configuration Standards • Configuration Standards may specify: • How the files are stored • Where the files are stored • Naming conventions • Who has access • Coding standards – e.g. comments, sections, etc • Interface descriptions

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