CISCO Semester I

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CISCO Semester I

• Chapter 6 Router Configuration
• SUNY Ulster Karl R. Wick

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Three Important Topics

• Configuration Files
• Configuration Modes
• Configuration Methods

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Router Configuration Files

• Configuration files tell the router about itself
  whenever it restarts (or reboots).
• If there is no file, the router enters setup mode
  and asks for information about itself.

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Router configuration file information
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Working with Release 11.x configuration files

• copy (from) source (to) destination

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Working with pre-Release 11.0 configuration files

• For legacy installations old test questions

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copy running-config tftp and copy tftp
running-config

• You can store backup copies on any TFTP server on
  the network.
• The server can be as simple as a workstation
  with a TFTP application.
• It can even be your own workstation.
• The TFTP application must be running before you
  issue the commands!

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Objective 6.1.5 Errata !!! (NVRAM)

• Instead of the commands shown use
• configure memory copy running startup
• show configuration show startup-config
• copy running startup OK as shown
• erase startup-config OK as shown

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Router Configuration Modes
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Specific Configuration Modes
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Using router configuration modes

• Global Mode allows configurations that effect the
  entire router
• Special modes effect only a single port or
  protocol

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Global configuration modes

• router configure terminal
• router(config) command
• router (config) command
• router (config) exit
• ie router(config) hostname lab_a
• router(config) enable secret password

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Configuring routing protocols

• Routing protocols are how routers share
  information.
• router config t
• router(config) router rip
• router(config) network 198.100.12.0
• router(config) exit
• router

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Routing Protocols

• RIP
• IGRP number lt--- 1 through 65k
• EIGRP
• OSPF
• BGP
• EGP
• static for static routes

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Interface configuration commands

• Router interfaces are shutdown by default.
• router(config) interface name
• router(config-if) no shutdown
• router(config-if) ip address add snm
• router(config-if) encapsulation type
• ppp and hdlc are common for serial ports
• arpa is common for ethernet ports

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Configuring a serial interface

• router config t
• router(config) int s0
• Exact order does not matter!
• router(config-if) ip address add snm
• router(config-if) no shutdown
• router(config-if) encap ppp
• router(config-if) clockrate 56000
• Use clockrate ONLY on DCE end of the cable

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Erasing Configuration Statements

• router config t
• router(config) no router rip
• router(config) int s1
• router(config if) no encapsulation HDLC
• router(config if) no ip address add snm
• router(config if) shutdown
• OR Erase the entire file and start over.
• router(config) erase run

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Passwords

• router(config) enable password password
• router(config) enable secret password
• router(config) line vty 0 4
• router(config-line) password password
• Must be configured to allow telnet access.
• router(config) line console 0
• router(config-line) password password

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Misc. Router configuration

• router(config) hostname name
• router(config if) description text
• router(config) banner motd .
• router(config) banner login .

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The End
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Really
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Why dont you believe me?
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We will be shutting down soon
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Go Home Already!