Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
- Updated:
- July 16, 2014
Chapter: Troubleshooting
Troubleshooting
The Cisco ASR 901 router undergoes extensive testing before it leaves the factory. If you encounter problems, use the information in this appendix to help isolate problems or to eliminate the router as the source of the problem.
This appendix contains the following sections:
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
Note Ensure you provide the customer service representative with any upgrade or maintenance information that was performed on the Cisco ASR 901 router after your initial installation (see Appendix C, “Site Log” for Site Log information.)
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 front panel of the router enable you to determine router performance and operation. For a description of these LEDs, see “Reading the LEDs” section.
When solving a problem, check the following router subsystems:
- Power and cooling systems—External power source, power cable, router power supply and circuit breaker, and router fans. 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
See Table A-1 for information to help you isolate the problem.
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The power source is not connected properly. Note When the Cisco ASR 901 1G router (DC unit) is powered ON, it takes about 30 seconds for the system LED to turn ON. |
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Check for an environmentally induced shutdown. (See “Environmental Reporting Features” section). |
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Check the chassis intake and exhaust vents for obstructions. Clear any obstructions. |
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Check the environmental site requirements in the “System Specifications” section . |
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Check the power 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. |
Environmental Reporting Features
The Cisco ASR 901 router has a temperature sensor to detect over temperature conditions inside the chassis. The over temperature detection triggers an alert at 70°C. This condition is reported to the processor as an interrupt, where software takes action to generate the appropriate alarms. If the router reaches a temperature of 85°C, the power supply will cycle to prevent the router from exceeding that temperature while being powered up state. See Table A-2 for help in interpreting environmental reporting features.
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The router operates at an abnormally high temperature. The following message appears on the console screen: |
Take corrective steps. For information about environmental operating conditions, see the System Specifications). |
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 Table A-3 for information to help you isolate the problem.
Reading the LEDs
The following sections describe the LEDs on the Cisco ASR 901 router.
Chassis LEDs
Table A-4 summarizes the LEDs on the chassis of the Cisco ASR 901 router. These LEDs are common to all versions of the Cisco ASR 901 router.
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T1/E1 Interface LEDs
Table A-5 summarizes the LEDs on the T1/E1 interface (available only for A901-12C-FT-D and A901-4C-FT-D).
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SFP Ethernet Interface LEDs
Table A-6 gives information about the LEDs on the SFP interface.
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RJ-45 Ethernet Interface LEDs
Table A-7 summarizes the LEDs on the RJ-45 Ethernet interface.
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