CHAPTER 4
Troubleshooting the Installation
This chapter contains general troubleshooting information to help isolate the cause of any difficulties you
might encounter during the installation and initial startup of the system.
Although an over-temperature condition is unlikely at initial startup, environmental monitoring functions are
included in this chapter because these too monitor internal voltages.
• Troubleshooting Overview, on page 101
• Troubleshooting the Power Subsystem, on page 103
• Troubleshooting the Route Processor Subsystem, on page 115
• Troubleshooting the Line Card, on page 122
• Troubleshooting the Cooling Subsystem, on page 127
Troubleshooting Overview
This section describes the methods used in troubleshooting the router. The troubleshooting methods are
organized according to the major subsystems in the router.
If you are unable to solve a problem on your own, you can contact a Cisco customer service representative
for assistance. When you call, have this information ready:
• Date you received the router and the chassis serial number (located on a label on the back of the chassis).
• Installed line card and Cisco software release number:
• Use the show version command to determine the Cisco software release number.
• Brief description of the symptoms and steps you have taken to isolate and solve the issue.
• Maintenance agreement or warranty information.
Troubleshooting Using a Subsystem Approach
To solve a system problem, try to isolate the problem to a specific subsystem. Compare the current router
behavior with the expected router behavior. Because a startup issue is usually attributable to one component,
it is most efficient to examine each subsystem, rather than trying to troubleshoot each router component.
For troubleshooting purposes in this chapter, the router consists of these subsystems:
• Power subsystem—Router chassis is shipped with up to two AC-input or DC-input power supply modules
installed in the chassis.
Cisco ASR 9901, ASR 9001, and ASR 9001-S Routers Hardware Installation Guide
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