Cisco 3800 Series Handbuch zur Fehlersuche - Seite 2

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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

When solving problems, consider the following subsystems:

•

Both the system power LED and the fans can help you troubleshoot a power problem. Check the

following items.

The Cisco 3845 router has two system power LEDs, one for each power supply, labeled SYS PWR1 and

Note

SYS PWR2.

With the power switch on, normal indications are:

•

Fault Indications

Check the following symptoms to locate or eliminate faults in the power and cooling systems:

•

Troubleshooting Cisco 3800 Series Routers

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.

Network modules and interface cards—LEDs on the modules and interface cards help identify a

failure.

Cables—External cables that connect the router to the network.

SYS LED steady green

SYS PWR LED steady green for the Cisco 3825 router, or SYS PWR1 or SYS PWR2 LED steady

green for the Cisco 3845 router (depending on which power supply is active)

Fans operating

With the power switch on, what color is the SYS LED?

If the LED is steady green, the router is receiving power and is functional.

–

If the LED is amber, the router is receiving power but is not functional.

–

If the LED is off, check the power source and power cable.

With the power switch on, the SYS LED steady green, and the SYS PWR LED (Cisco 3825) or

SYS PWR1 or SYS PWR2 LED (Cisco 3845) steady green, do the fans operate?

–

If yes, the power system is functioning.

–

If no, check the fans.

"LEDs" section on page

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