Troubleshooting Overview; Problem Solving With Subsystems; Identifying Startup Problems - Cisco 7000 Hardware Installation And Maintenance

Troubleshooting Overview

Troubleshooting Overview
This section describes the troubleshooting methods used in this chapter and defines how the router
is divided into subsystems for more efficient problem solving. A description of a normal startup
sequence contains pointers to sections in this chapter that contain troubleshooting procedures for
specific components so that you can determine where your system is having trouble and then
troubleshoot that specific component or subsystem.

Problem Solving with Subsystems

The key to problem solving the system is to try to isolate the problem to a specific subsystem. The
first step in solving startup problems is to compare what the system is doing to what it should be
doing. Since a startup problem is usually attributable to a single component, it is more efficient to
first isolate the problem to a subsystem rather than troubleshoot each separate component in the
system. For these troubleshooting procedures, consider the following subsystems:
•
•
•
•
The following sections will help you isolate a problem to one of these subsystems and will direct
you to the appropriate troubleshooting section.

Identifying Startup Problems

When you start up the router for the first time, you should observe the startup sequence described in
the chapter "Installing the Router."
This section contains a more detailed description of the normal startup sequence and describes the
steps to take if the system does not perform that sequence as expected.
With the exception of the system blower, LEDs indicate all system states in the startup sequence. By
checking the state of the LEDs, you can determine when and where the system failed in the startup
sequence. Use the following descriptions to isolate the problem to a subsystem, then proceed to the
appropriate sections (indicated in each description) to try to resolve the problem.
When you start up the system by turning on the power supply switches, the following should occur:
•
4-152 Cisco 7000 Installation and Maintenance
Power subsystem—This subsystem includes the power supplies and power supply fans.
Cooling subsystem—The chassis blower is the single component in this subsystem. The blower
should be operating whenever system power is on and will usually continue to operate even when
the environmental monitor shuts down the system because of an overtemperature or overvoltage
condition (although it will shut down in the event of a power supply shutdown). Since the blower
generates a noise level of 60 dBa, it is easy to determine whether or not it is operating. If you
determine that the blower is not operating, the only recourse is to immediately contact a customer
service representative. The blower is located in the interior of the chassis, and there are no
installation adjustments that you should make if it does not function properly at initial startup.
Processors subsystem—The RP contains the system operating software, so trouble with the
system software initialization falls into this subsystem.
The enabled LED—This subsystem comprises the SP (or SSP) and all interface processors. The
enabled LED on the SP (or SSP) and each interface processor indicates whether or not the RP
was able to initialize the board. Remember that an interface processor that is partially installed
in the backplane will cause the system to hang and crash.
You should immediately hear the system blower operating (it generates an operating noise level
of about 60 dBa). If not, proceed to the following section, "Troubleshooting the Power
Subsystem." If you determine that the power supplies are functioning normally and that the
blower is faulty, contact a customer service representative. If the system blower does not function
properly at initial startup, there are no installation adjustments that you should make.