1 © 2004, Cisco Systems, Inc. All rights reserved. Chapter 6 Configuring a Router/ Learning About...

Chapter 6

Configuring a Router/ Learning About Other Devices/ Managing Cisco IOS Software

Objectives

Command-Line InterfaceCommand Modes

Configuring a Router Name

Configuring Router Passwords

Examining the show Commands

• Many show commands can be used to examine the contents of files in the router and for troubleshooting.

• In both privileged EXEC and user EXEC modes, the command show ? provides a list of available show commands.

Interface Configuration Commands

Configuring an Ethernet Interface

Importance of Configuration Standards

Configuring Interface Descriptions

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

Login Banners

Configuring Message-of-the-Day (MOTD)

Host Name Resolution

Host Table Configuration

Configuration Backup and Documentation

The copy running-config tftp Command

The copy tftp running-config Command

Summary

Learning About Other Devices

Objectives

Cisco Discovery Protocol (CDP)

CDP is media and protocol independent, and runs on all Cisco equipment over the Subnetwork Access Protocol (SNAP).

Showing CDP Neighbor Entries

Implementation, Monitoring, and Maintenance of CDP

The show cdp interface Command

The show cdp neighbors Command

Creating a Network Map

• The show cdp neighbors [type number] [detail] command can be used to obtain the following:

Device ID — Address

Port ID — Capabilities

Version — Platform

IP network prefix

VTP management domain name (CDPv2 only)

Native VLAN (CDPv2 only)

Full/Half duplex (CDPv2)

Disabling CDP

Troubleshooting CDP

The show cdp traffic Command

Telnet

Telnet Operations

Establishing Telnet Connections

• To initiate a Telnet session any of the following alternatives can be used:

Denver>connect parisDenver>paris Denver>131.108.100.152Denver>telnet paris

• A hostname table or access to DNS for Telnet must be present for a name to work. Otherwise, the IP address of the remote router must be entered.

• Telnet can be used to determine if a remote router can be accessed.

Telnet Operations

Advanced Telnet Operation

Multiple Telnet sessions can be used and suspended with the Ctrl+Shift+6 then x sequence.

Testing with the ping Command

Testing with the traceroute Command

Troubleshooting IP Addressing Issues

Summary

Managing Cisco IOS Software

Objectives

Router Startup Sequence

Locating IOS Software

Using the boot system Command

Configuration Register Values

The order in which the router looks for system bootstrap information depends on the boot field setting in the configuration register. The default configuration register setting can be changed with the global configuration mode command config-register. Use a hexadecimal number as the argument for this command.

Identifying Boot Image Source

Software Components in Memory

Fields in the IOS Name

Managing Configuration Files Using TFTP

Managing Configuration Files Using Copy and Paste

Managing IOS Images Using TFTP

The confreg Command

Managing IOS Using XModem

The tftpdnld Command

File System Verification

• There are several commands that can be used to verify the router file system.

show version

show flash

The show version Command

The show flash Command

Summary

Question/Answer

1 © 2004, Cisco Systems, Inc. All rights reserved. Chapter 6 Configuring a Router/ Learning About...

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