120 Labs for Cisco CCNA 200-125 and CCENT Exams

Lab 57: Changing the Configuration Register on Cisco IOS Devices

Lab Objective:

The objective of this lab exercise is for you to learn and understand how to change the configuration register value on Cisco IOS devices.

Lab Purpose:

Changing the configuration register is a fundamental skill. The configuration register is typically changed when performing a password recovery procedure on a Cisco IOS device. The settings within the configuration register are used to change the default behavior of Cisco IOS devices. As a Cisco engineer, as well as in the Cisco CCNA exam, you will be expected to know how to change and verify the configuration register.

Certification Level:

This lab is suitable for CCENT and CCNA certification exam preparation.

Lab Difficulty:

This lab has a difficulty rating of 2/10.

Readiness Assessment:

When you are ready for your certification exam, you should complete this lab in no more than 5 minutes.

Lab Topology:

Please use any single router or switch to complete this lab.

Task 1:

Configure any desired hostname on your device.

Task 2:

Verify the current setting of the configuration register using the show version command. The configuration register will be at the very end of the output from this command.

Task 3:

Change the configuration register value to 102 and save your configuration. Verify that your new configuration register will be used after your device has been rebooted.

Configuration and Verification

Task 1:

For reference information on configuring hostnames, please refer to earlier labs.

Task 2:

R1#show version 
Cisco Internetwork Operating System Software 
IOS (tm) C2600 Software (C2600-IK9O3S3-M), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport 
Copyright (c) 1986-2008 by cisco Systems, Inc. 
Compiled Mon 17-Mar-08 15:23 by dchih 

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1) 

R1 uptime is 2 hours, 12 minutes 
System returned to ROM by power-on 
System image file is “flash:c2600-ik9o3s3-mz.123-26.bin” 

If you require further assistance please contact us by sending email to export@cisco.com. 

cisco 2610 (MPC860) processor (revision 0x203) with 61440K/4096K bytes of memory. 
Processor board ID JAD05090GA8 (596408632) 
M860 processor: part number 0, mask 49 
Bridging software. 
X.25 software, Version 3.0.0. 1 
Ethernet/IEEE 802.3 interface(s) 
2 Serial network interface(s) 
32K bytes of non-volatile configuration memory. 
16384K bytes of processor board System flash (Read/Write) 

Configuration register is 0x2102 

[Output Truncated]

Task 3:

R1#conf t 
Enter configuration commands, one per line.  End with CTRL/Z. 
R1(config)#config-register 0x102 
R1(config)#end 
R1# 
R1#show version 
Cisco Internetwork Operating System Software 
IOS (tm) C2600 Software (C2600-IK9O3S3-M), Version 12.3(26), RELEASE SOFTWARE (fc2)
 Technical Support: http://www.cisco.com/techsupport 
Copyright (c) 1986-2008 by cisco Systems, Inc. 
Compiled Mon 17-Mar-08 15:23 by dchih 

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1) 

R1 uptime is 2 hours, 13 minutes 
System returned to ROM by power-on 
System image file is “flash:c2600-ik9o3s3-mz.123-26.bin” 

cisco 2610 (MPC860) processor (revision 0x203) with 61440K/4096K bytes of memory. 
Processor board ID JAD05090GA8 (596408632) 
M860 processor: part number 0, mask 49 
Bridging software.
X.25 software, Version 3.0.0. 
1 Ethernet/IEEE 802.3 interface(s) 
2 Serial network interface(s) 
32K bytes of non-volatile configuration memory. 
16384K bytes of processor board System flash (Read/Write) 

Configuration register is 0x2102 (will be 0x102 at next reload) 

[Output Truncated]

NOTE: The configuration register is always in hexadecimal format. Therefore, always remember to issue the 0x before specifying the desired configuration register value. This is often forgotten, so ensure that you remember it!

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