1 © 2004, Cisco Systems, Inc. All rights reserved. Chapter 6 Configuring a Router/ Learning About Other Devices/ Managing Cisco IOS Software

222 © 2004, Cisco Systems, Inc. All rights reserved. Objectives

333 © 2004, Cisco Systems, Inc. All rights reserved. Command-Line Interface Command Modes

444 © 2004, Cisco Systems, Inc. All rights reserved. Configuring a Router Name

555 © 2004, Cisco Systems, Inc. All rights reserved. Configuring Router Passwords

666 © 2004, Cisco Systems, Inc. All rights reserved. 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.

777 © 2004, Cisco Systems, Inc. All rights reserved. Interface Configuration Commands

888 © 2004, Cisco Systems, Inc. All rights reserved. Configuring an Ethernet Interface

999 © 2004, Cisco Systems, Inc. All rights reserved. Importance of Configuration Standards

10 © 2004, Cisco Systems, Inc. All rights reserved. Configuring Interface Descriptions An interface description should identify important information such as a router, a circuit number, or a specific network segment.

11 © 2004, Cisco Systems, Inc. All rights reserved. Login Banners

12 © 2004, Cisco Systems, Inc. All rights reserved. Configuring Message-of-the-Day (MOTD)

13 © 2004, Cisco Systems, Inc. All rights reserved. Host Name Resolution

14 © 2004, Cisco Systems, Inc. All rights reserved. Host Table Configuration

15 © 2004, Cisco Systems, Inc. All rights reserved. Configuration Backup and Documentation

16 © 2004, Cisco Systems, Inc. All rights reserved. The copy running-config tftp Command

17 © 2004, Cisco Systems, Inc. All rights reserved. The copy tftp running-config Command

18 © 2004, Cisco Systems, Inc. All rights reserved. Summary

19 © 2004, Cisco Systems, Inc. All rights reserved. Learning About Other Devices

20 © 2004, Cisco Systems, Inc. All rights reserved. Objectives

21 © 2004, Cisco Systems, Inc. All rights reserved. Cisco Discovery Protocol (CDP) CDP is media and protocol independent, and runs on all Cisco equipment over the Subnetwork Access Protocol (SNAP).

22 © 2004, Cisco Systems, Inc. All rights reserved. Showing CDP Neighbor Entries

23 © 2004, Cisco Systems, Inc. All rights reserved. Implementation, Monitoring, and Maintenance of CDP

24 © 2004, Cisco Systems, Inc. All rights reserved. The show cdp interface Command

25 © 2004, Cisco Systems, Inc. All rights reserved. The show cdp neighbors Command

26 © 2004, Cisco Systems, Inc. All rights reserved. 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)

27 © 2004, Cisco Systems, Inc. All rights reserved. Disabling CDP

28 © 2004, Cisco Systems, Inc. All rights reserved. Troubleshooting CDP

29 © 2004, Cisco Systems, Inc. All rights reserved. The show cdp traffic Command

30 © 2004, Cisco Systems, Inc. All rights reserved. Telnet

31 © 2004, Cisco Systems, Inc. All rights reserved. Telnet Operations

32 © 2004, Cisco Systems, Inc. All rights reserved. Establishing Telnet Connections To initiate a Telnet session any of the following alternatives can be used: Denver>connect paris Denver>paris Denver> Denver>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.

33 © 2004, Cisco Systems, Inc. All rights reserved. Telnet Operations

34 © 2004, Cisco Systems, Inc. All rights reserved. Advanced Telnet Operation Multiple Telnet sessions can be used and suspended with the Ctrl+Shift+6 then x sequence.

35 © 2004, Cisco Systems, Inc. All rights reserved. Testing with the ping Command

36 © 2004, Cisco Systems, Inc. All rights reserved. Testing with the traceroute Command

37 © 2004, Cisco Systems, Inc. All rights reserved. Troubleshooting IP Addressing Issues

38 © 2004, Cisco Systems, Inc. All rights reserved. Summary

39 © 2004, Cisco Systems, Inc. All rights reserved. Managing Cisco IOS Software

40 © 2004, Cisco Systems, Inc. All rights reserved. Objectives

41 © 2004, Cisco Systems, Inc. All rights reserved. Router Startup Sequence

42 © 2004, Cisco Systems, Inc. All rights reserved. Locating IOS Software

43 © 2004, Cisco Systems, Inc. All rights reserved. Using the boot system Command

44 © 2004, Cisco Systems, Inc. All rights reserved. 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.

45 © 2004, Cisco Systems, Inc. All rights reserved. Identifying Boot Image Source

46 © 2004, Cisco Systems, Inc. All rights reserved. Software Components in Memory

47 © 2004, Cisco Systems, Inc. All rights reserved. Fields in the IOS Name

48 © 2004, Cisco Systems, Inc. All rights reserved. Managing Configuration Files Using TFTP

49 © 2004, Cisco Systems, Inc. All rights reserved. Managing Configuration Files Using Copy and Paste

50 © 2004, Cisco Systems, Inc. All rights reserved. Managing IOS Images Using TFTP

51 © 2004, Cisco Systems, Inc. All rights reserved. The confreg Command

52 © 2004, Cisco Systems, Inc. All rights reserved. Managing IOS Using XModem

53 © 2004, Cisco Systems, Inc. All rights reserved. The tftpdnld Command

54 © 2004, Cisco Systems, Inc. All rights reserved. File System Verification There are several commands that can be used to verify the router file system. show version show flash

55 © 2004, Cisco Systems, Inc. All rights reserved. The show version Command

56 © 2004, Cisco Systems, Inc. All rights reserved. The show flash Command

57 © 2004, Cisco Systems, Inc. All rights reserved. Summary

58 © 2004, Cisco Systems, Inc. All rights reserved. Question/Answer