Solving Problems - Cisco Network Device 2800 Introduction Manual

Solving Problems

Solving Problems
The key to solving problems is to isolate the problem to a specific subsystem by comparing what the
router is doing to what it should be doing.
The LEDs on the front and rear panel of the router enable you to determine router performance and
operation. LEDs are described in the following sections:
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When solving problems, consider the following router subsystems:
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Troubleshooting the Power and Cooling Systems
Both the system LED and the fans can help you troubleshoot a power problem. Check the following
items to help isolate the problem:
Normal Indications
With the power switch on, the normal indications are:
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Fault Indications
Check the following symptoms to locate or eliminate faults in the power and cooling systems:
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Troubleshooting Cisco 2800 Series Routers
2
Reading System LEDs, page 4
Reading Port and Module LEDs, page 6
Power and cooling systems—External power source, power cable, router power supply and circuit
breaker, and router blower and fan. Also consider inadequate ventilation or air circulation.
Modules—LEDs on the modules help identify a failure.
Cables—External cables that connect the router to the network.
SYS PWR LED on green and continuous
Fans operating
AUX/PWR LED on green and continuous, if the IP phone power module or Cisco Redundant Power
Supply (RPS) is installed
With the power switch on, is the SYS PWR LED on?
If the LED is green and continuous, the router is receiving power and is functional.
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If the LED is amber, the router is receiving power but is not functional.
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– If the LED is off, check the power source and power cable.
With the power switch on and the SYS PWR LED on and green, do the fans operate?
If no, check the fans.
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If yes, the power system is functioning.
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With the power switch on and the PWR SYS LED off, do the fans operate?
If yes, the router is receiving power. The fans are connected directly to the DC outputs of the
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power supply.
If no, check the power source and power cable.
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