CHAPTER
Running Diagnostics on the Cisco12008 6-1
6
Running Diagnostics on the Cisco 12008
Field diagnostics are available for the Cisco12008 to help you iso late faulty hardware to
the level of a field-replaceable unit (FRU) without disrupting the operation of the system.
After you identify the faulty unit, you can replace it with a spare unit.
Field diagnostics are not designed to identify specific components within the router. They
simply determine whether a particular card is operational or defective.
Running Diagnostics on the Cisco12008 is presented in the following sections:
Diagnostic Test Overview on page1
Using the diag Command on page2
Diagnostic Testing Sequence on page3
Loading and Running Diagnostics on page4

Diagnostic Test Overview

There are more than a hundred diagnostic tests for line cards, including the following:
Processor tests
Memory tests
Component tests
Major data path tests
The field diagnostics software image is bundled with the Cisco IOS software and is
downloaded from the route processor (RP) to the target card before testing.