Appendix A Troubleshooting

Problem Solving

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

Troubleshooting the Power and Cooling Systems

See Table A-1for information to help you isolate the problem.

Table A-1

Troubleshooting the Power and Cooling Systems

 

 

 

 

 

Symptom

 

Possible Cause

Corrective Action

 

 

 

The power (labeled PWR) LED

The power source is not

Check the DC input.

on the front panel is not on.

connected properly.

Check the DC source.

 

 

 

 

 

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.

 

 

 

 

The router shut down after being

The cause is environmental.

Check for an environmentally

on for only a short time.

 

induced shutdown. (See

 

 

 

“Environmental Reporting

 

 

 

Features” section on page A-2).

 

 

 

 

 

 

The fans do not work; the router

Check the fans.

 

 

overheats and shuts down.

 

 

 

 

 

 

 

The chassis intake and exhaust

Check the chassis intake and

 

 

vents are obstructed.

exhaust vents for obstructions.

 

 

 

Clear any obstructions.

 

 

 

 

 

 

Installation does not meet

Check the environmental site

 

 

environmental site

requirements in the “System

 

 

requirements.

Specifications” on page -7.

 

 

 

The router partially boots, but

There is a possible power supply

Check the power LED on the

the LEDs do not light.

failure.

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-2for help in interpreting environmental reporting features.

Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide

 

A-2

OL-23778-01

 

 

 

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Cisco Systems ASR 901 manual Troubleshooting the Power and Cooling Systems, Environmental Reporting Features

ASR 901 specifications

Cisco Systems ASR 901 is an advanced aggregation services router that is designed to meet the needs of service providers and enterprise networks. It offers a versatile platform suitable for various deployment scenarios ranging from mobile backhaul and broadband aggregation to IP edge routing. The ASR 901 is known for its compact size, energy efficiency, and robust performance, making it a preferred choice for operators looking to enhance their network infrastructure.

One of the main features of the Cisco ASR 901 is its small form factor, which facilitates installation in space-constrained environments. Its design allows for easy deployment in both indoor and outdoor settings, making it ideal for applications such as cell site backhaul and remote locations. The router supports a wide range of interfaces, including Ethernet and T1/E1, providing flexibility in connecting different network types.

The ASR 901 is built on Cisco's IOS XR software, ensuring a highly reliable and secure operating environment. This software is known for its scalability and robustness, providing operators with the ability to support large numbers of subscribers and high traffic volumes. The router also supports system redundancy features, ensuring continuous service availability and minimizing downtime.

In terms of performance, the Cisco ASR 901 delivers high throughput and low latency, which are crucial for delivering quality services like voice, video, and data. With its support for advanced network technologies such as MPLS and IPv6, the ASR 901 can effectively manage complex networking requirements while accommodating future growth.

Security is also a key consideration with the ASR 901. It includes features such as advanced encryption, access control lists, and intrusion prevention systems, aimed at protecting the integrity of network communications. Moreover, its support for Virtual LAN (VLAN) tagging and Quality of Service (QoS) mechanisms allows for efficient traffic management and prioritization, ensuring that critical applications receive the necessary bandwidth.

Furthermore, Cisco provides comprehensive management tools for the ASR 901, allowing network administrators to easily monitor and configure the router. Features like SNMP and NetFlow enable operators to gain insights into network performance and usage patterns, facilitating proactive management of their environments.

Overall, the Cisco Systems ASR 901 stands out as a powerful and flexible router, designed to meet the evolving demands of modern networks. Its combination of compact design, scalability, and advanced features positions it as an ideal solution for service providers and enterprises seeking reliable and efficient network solutions.