Chap 6Router Configuration I

Andres, Wen-Yuan Liao

Department of Computer Science and Engineering

De Lin Institute of Technology

andres@dlit.edu.tw

http://www.cse.dlit.edu.tw/~andres

Overview

Use router modes and configuration methods to update a router's configuration file with current and prior versions

Router Configuration Files

Configuration file information

11.x configuration files

11.0 configuration files

copy running-config tftp and copy tftp running-config

Use NVRAM with Release 11.x

Use NVRAM with Pre-11.0

Router conf. file information

Conf. files can come from the console, NVRAM, or TFTP server

The conf. file contains commands to customize router operation

11.x configuration files

Use the privileged EXEC configure command to configureFrom a virtual (remote) terminal, a modem connection, or a console terminal

Load a conf. from a TFTP server

Using TFTP ServerThe network configuration file: apply to all routers and terminal servers on the network

The host configuration file: apply to one router

Router Configuration Modes

Using router conf. modes

Global configuration modes

Configuring routing protocols

Interface confi. commands

Configuring a specific interface

Use router conf. modes

User modeSubset of the EXEC commands

Privileged mode Global configuration mode and specific configuration modes

Use router conf. modes

If you type exit, the router will back out one levelCtrl-Z leaves conf. mode completely and returns the router to privileged EXEC mode

Configure a specific interface

On serial linksOne side(DCE)

Provide a clocking signalThe other side (DTE) By default, Cisco routers are DTE devices, but they can be used as DCE devices

Configure a specific interface

If you are using an interface to provide clocking, you must specify a rate with the clockrate command

The bandwidth command overrides the default bandwidth

Two connections on Ethernet interfaces:an attachment unit interface (AUI) connector

a 10BASE-T connector

Configuration Methods

11.x configuration methods

11.0 configuration methods

Password conf. methods

Router identification conf.

Password configuration methods

Password can be established both on individual lines and in the privileged EXEC mode

line console 0 -- the console terminal line vty 0 4 -- Telnet sessions

enable password -- restricts access to privileged EXEC mode

enable secret password -- uses a Cisco proprietary encryption process to alter the password character string

Password configuration methods

service password-encryptionFurther protect passwords from being displayed

This encryption algorithm does not match the Data Encryption Standard (DES)

Password configuration methods

Router identification conf.

Name your routerThe host name and is the name

displayed by the system prompt

banner motdA message-of-the-day banner to

be displayed on all connected terminals

Summary Configuration files The console, NVRAM, or TFTP server

Privileged mode

Global configuration mode

Other configuration modes

Host name/ banner/interface descriptions