Problem Solving With Cisco 7500 Series Subsystems - Cisco 7500 Series Configuration Manual

Chapter 8 Troubleshooting a Cisco 7500 Series Router
R E V I E W D R A F T — C I S C O C O N F I D E N T I A L

Problem Solving with Cisco 7500 Series Subsystems

The key to solving problems in 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.
Because 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 component in the system.
For the troubleshooting procedures in this chapter, the Cisco 7500 series consists of the following
subsystems:
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The following sections will help you isolate a problem in a Cisco 7500 series router and one of its
subsystems, and will direct you to the appropriate troubleshooting information:
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OL-5008-03 B0
Power subsystem—Comprises the power supplies, external power cable, and system backplane.
Cooling subsystem—Comprises the fan or blower, which includes the fan/blower, any blower speed
control board that might be present, any front-panel LEDs that might be present, and the fan tray
(Cisco 7505) or blower module (Cisco 7507, Cisco 7507-MX, Cisco 7513, Cisco 7513-MX, and
Cisco 7576) assembly itself. The fan or blower should be operating whenever the system power is
on.
The variable speed feature in the Cisco 7513, Cisco 7513-MX, and Cisco 7576 allows the blower to
operate at a slower speed and provide quieter operation when the internal chassis temperature is
within the normal operating range. If the internal temperature exceeds a specified temperature, the
blower speed increases to move more cooling air through the chassis. As a result, it may be difficult
to determine whether or not the blower is operating in noisy, air-conditioned rooms. If you determine
that the blower is not operating, contact a service representative immediately; there are no
installation adjustments that you should make.
Processor subsystem—Includes the RSP (or RSPs) and all interface processors. Each RSP runs the
system operating software (contained in an onboard Flash memory SIMM or on a Flash memory
card), and the enabled LED on each interface processor indicates whether or not the RSP was able
to initialize it. Remember that an interface processor that is partially installed in the backplane might
cause the system to hang and crash.
Troubleshooting Guidelines for the Cisco 7505, page 8-4
Troubleshooting Guidelines for the Cisco 7507 and Cisco 7507-MX, page 8-8
Troubleshooting Guidelines for the Cisco 7513, Cisco 7513-MX, and Cisco 7576, page 8-12
Troubleshooting Blower Operation, page 8-17

Problem Solving with Cisco 7500 Series Subsystems

Cisco 7500 Series Installation and Configuration Guide
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