Problem Solving With Subsystems; Identifying Startup Problems - Cisco Router 7204 Installation And Configuration Manual

Chapter 5 Troubleshooting the Installation

Problem Solving with Subsystems

The key to solving problems with the system is isolating 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.
Because a startup problem is usually caused by a single component, it is more efficient to first isolate
the problem to a subsystem rather than troubleshoot each 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 direct you to the
appropriate troubleshooting section.

Identifying Startup Problems

Startup problems are commonly due to the source power or to a board (network processing engine, I/O
controller, or port or service adapter) that is dislodged from the midplane. Although an overtemperature
condition is unlikely at initial startup, the environmental monitoring functions are included in this
chapter because they also monitor internal voltages.
When you start up the Cisco 7204 for the first time, you should observe the startup sequence described
in the
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 fan tray and network processing engine, 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 to try to resolve the problem.
When you start up the system by turning on the power supply switch, the following should occur:
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•
•
OL-5101-01
Power subsystem—This subsystem comprises the power supplies, the external power cable, and the
midplane.
Cooling subsystem—The chassis fan tray is the single component in this subsystem. The fans should
be operating whenever system power is on. Replace the fan tray if you determine a fan is not
functioning properly.
Processor subsystem—This subsystem includes the I/O controller, network processing engine, and
all port and service adapters. The system memory and management functions reside on the I/O
controller and the network processing engine, and the enabled LED on each port and service adapter
indicates if the adapter is initialized. An adapter that is partially installed in the midplane can cause
the system to hang and crash.
"Starting the Cisco 7204" section on page 3-23
You should immediately hear the fans operating. If not, proceed to the
Cooling Subsystem" section on page
normally and that a fan is faulty, contact a customer service representative. If a fan does not function
properly at initial startup, there are no installation adjustments that you should make.
The power supply's green power OK LED (at the rear of the chassis) should come on immediately
when you place the power supply switch in the ON (|) position, and remain on during normal system
operation.
If the green power OK LED does not come on, proceed to the section "Troubleshooting the Power
Subsystem."
The LEDs on the I/O controller should come on as follows:
in Chapter 3, "Installing the Cisco
5-7. If you determine that the power supply is functioning
Cisco 7204 Installation and Configuration Guide
Troubleshooting Overview
7204". This
section"Troubleshooting the
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