Cisco ASR 901S Series Operating instructions

Troubleshooting

If you encounter problems while the router is in operation, use the information in this appendix to help isolate

problems or to eliminate the router as the source of the problem.

If you cannot locate the source of the problem, contact a customer service representative for information on

how to proceed. For technical support information, see the Cisco Information Packet publication that shipped

with your router. Before you call, have the following information ready:

•Chassis type and serial number

•Maintenance agreement or warranty information

•Type of software and version number

•Date you received the new chassis

•Brief description of the problem

•Brief explanation of the steps you took to isolate the problem

Ensure you provide the customer service representative with any upgrade or maintenance information that

was performed on the router after your initial installation.

Note

This appendix contains the following sections.

•Problem Solving , page 1

•Reading LEDs , page 4

Problem Solving

To solve a problem, isolate the problem to a specific subsystem by comparing the current router activity to

the expected router activity.

The LEDs on the bottom panel of the router enable you to determine router performance and operation. For

a description of these LEDs, see Reading LEDs , on page 4.

When solving a problem, check the following router subsystems:

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•Power and cooling systems—External power source, power cable, router power supply, and circuit

breaker. Also check for inadequate ventilation or air circulation.

•Modules—Checking the LEDs on the modules can help you to identify a failure.

•Cables—Ensure that the external cables connecting the router to the network are all secure.

Troubleshooting the Power and Cooling Systems

Corrective ActionPossible CauseSymptom

Check for an environmentally

induced shutdown. (See

Environmental Reporting Features,

on page 2.)

The cause is environmental.The System LED on the bottom

panel is not on.

Check the light pipe connection.Light pipe is not connected

properly.

•Check the DC or AC input.

•Check the DC or AC source.

The power source is not connected

properly.

The router shuts down after being

on for only a short time.

Check the chassis intake and heat

sink fins for obstructions. Clear any

obstructions.

The chassis intake and heat sink

fins are obstructed.

Check the environmental

specifications table in Table 3.

Installation does not meet

environmental site requirements.

Check the Management LED on

the front panel of the router. If the

LED is on, the power supply is

functional. If the LED is off, refer

to the Cisco Information Packet for

warranty information or contact

customer service.

There is a possible power supply

failure.

The router partially boots, but the

LEDs do not come on.

Environmental Reporting Features

The router has a temperature sensor to detect over temperature conditions inside the chassis. When over

temperature is detected it is reported to the processor as an interrupt, where the software generates the

appropriate alarms. If the router reaches a temperature of 248°F (120°C), the power supply cycles itself to

prevent the router from exceeding the maximum temperature while being powered up.

See the following table for help in interpreting environmental reporting features.

Cisco ASR 901S Series Aggregation Services Router Hardware Installation Guide

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Troubleshooting

Troubleshooting the Power and Cooling Systems

Corrective ActionPossible CauseSymptom

Take corrective steps. See the

environmental specifications table

in Product Specifications.

For over temperature alert settings,

see Environmental Monitoring

Temperature Sensor.

The air flow to the heat sink fins is

blocked.

The router operates at an

abnormally high temperature. The

following message appears on the

console screen:

%SYS-1-OVERTEMP: System

detected OVERTEMPERATURE

condition. Please resolve

cooling problem immediately!

Troubleshooting Cables and Connections

Network problems can be caused by a cable or cable connection, or external device such as a modem,

transceiver, hub, wall jack, WAN interface, or terminal. See the following table for information to help you

isolate the problem.

Corrective ActionPossible CauseSymptom

Check the router chassis or

software. For warranty information,

refer to the Cisco Information

Packet publication that shipped

with your router or contact

customer service.

The router does not boot properly.

The router constantly or

intermittently reboots.

The router is experiencing network

problems.

Verify that the parameters for your

terminal are set as follows:

•The terminal should have the

same data rate as the router

(9600 bps is the default).

•8 data bits.

•No parity generated or

checked.

•2 stop bits.

The router boots, but the console

screen is frozen.

There may be a problem with the

module or cable. For warranty

information, refer to the Cisco

Information Packet publication that

shipped with your order or contact

customer service.

The router powers on and boots

only when a particular cable is

disconnected.

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Troubleshooting

Troubleshooting Cables and Connections

Reading LEDs

The following table summarizes the LEDs on the chassis of the router. These LEDs are common to all chassis

models, however, these LEDs may be turned off using Cisco IOS CLIs. By default all three LEDs are enabled.

DescriptionColor/StateFunctionLED Label

System is in ROM Monitor

(ROMMON) mode

OffSystem status1

No hardware failure detected;

system is in Cisco IOS prompt

mode

Green

Minor hardware failure

detected

Amber

Major hardware failure (critical

temperature or voltage)

detected

Red

No powerOffManagement status2

System booted fine and is in

Cisco IOS prompt mode

Green

Software upgrade is in progress

(MCU or ROMMON)

Amber

Cisco IOS boot in progress or

in ROMMON mode

Red

Fast Ethernet port and slot not

connected

OffNetwork status3

Fast Ethernet port and

slot—link and line protocol is

up.

Green

Fast Ethernet port and

slot—administration is down

Amber

Fast Ethernet port and

slot—line protocol is down

Red

Cisco ASR 901S Series Aggregation Services Router Hardware Installation Guide

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Troubleshooting

Reading LEDs

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