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Chapter 6

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

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Objectives

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Command-Line InterfaceCommand Modes

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Configuring a Router Name

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Configuring Router Passwords

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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.

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Interface Configuration Commands

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Configuring an Ethernet Interface

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Importance of Configuration Standards

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Configuring Interface Descriptions

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

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Login Banners

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Configuring Message-of-the-Day (MOTD)

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Host Name Resolution

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Host Table Configuration

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Configuration Backup and Documentation

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The copy running-config tftp Command

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The copy tftp running-config Command

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Summary

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Learning About Other Devices

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Objectives

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Cisco Discovery Protocol (CDP)

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

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Showing CDP Neighbor Entries

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Implementation, Monitoring, and Maintenance of CDP

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The show cdp interface Command

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The show cdp neighbors Command

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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)

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Disabling CDP

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Troubleshooting CDP

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The show cdp traffic Command

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Telnet

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Telnet Operations

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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.

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Telnet Operations

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Advanced Telnet Operation

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

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Testing with the ping Command

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Testing with the traceroute Command

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Troubleshooting IP Addressing Issues

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Summary

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Managing Cisco IOS Software

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Objectives

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Router Startup Sequence

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Locating IOS Software

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Using the boot system Command

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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.

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Identifying Boot Image Source

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Software Components in Memory

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Fields in the IOS Name

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Managing Configuration Files Using TFTP

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Managing Configuration Files Using Copy and Paste

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Managing IOS Images Using TFTP

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The confreg Command

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Managing IOS Using XModem

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The tftpdnld Command

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File System Verification

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

show version

show flash

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The show version Command

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The show flash Command

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Summary

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Question/Answer