Cisco CCNA 2 Instructor Manual page 55

If the router does not boot properly, the show version command can be used to identify the
configuration register setting. The boot field indicates where the router is configured to boot
from and the config-register command is used to make any necessary changes.
If the router IOS does not boot properly, there are several things that could be wrong:
•
Boot system statement in configuration file
•
Incorrect configuration register value
•
Corrupted flash image
•
Hardware failure
Instruct students to use the show version command to check the configuration register
value. When a router does not boot properly it is usually because the configuration register
setting is incorrect. For students to understand the impact that the boot sequence and the
configuration register has on routing, they must perform the hands-on labs. Make sure each
student can complete and explain the labs. Discuss the results and purpose of the labs after
they have been completed by all of the students.
Instruct students to verify the configuration register setting on a regular basis. Occasionally
change the configuration register settings and allow them to troubleshoot the errors that occur.
Additional Resources
http://www.cisco.com/en/US/products/hw/routers/ps233/products_tech_note09186a00800a65
a5.shtml
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_summary_cha
pter09186a00800801b1.html
5.2 Managing the Cisco File System
Essential Labs:
Optional Labs:
Core TIs:
Optional TIs:
Course-Level Claim: Students can manage system image and device configuration files.
Certification-Level Claim: Students can manage system image and device configuration
files.
Hands-on skills: none
54 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 5
5.2.3, 5.2.5, 5.2.6a, and 5.2.6b
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