Cisco CISCO1721 Guia de Instalação descarregar pdf (Página 57)

3-7

Cisco 1721 Router Hardware Installation Guide

78-13834-02

Chapter 3 Troubleshooting

Problem Solving

Step 3 Press Ctrl-Z to exit configuration mode:

Router(config)# Ctrl-Z

Step 4 Reboot the router, and enter the recovered enable password.

Problem Solving

The key to problem solving is to isolate the problem to a specific subsystem by

comparing what the router is doing to what it should be doing.

In problem solving, consider the following subsystems of the router:

• WICs—Refer to the LEDs on the cards and the LEDs on the router front panel

to help identify a failure. For more information on WICs, refer to the

Cisco WAN Interface Cards Hardware Installation Guide, which comes with

each card.

• Cables—Check all the external cables that connect the router to the network.

• Power system—Check the external power source, power cable, router power

supply, and circuit breaker. Check for inadequate ventilation or air circulation

that might cause overheating.

• ISDN configuration—Consider ISDN-specific hardware and software

configurations (ISDN BRI WICs only).

OK LED Diagnostics

Use the front-panel OK LED to determine any problems with the router. When the

router first boots up, it performs a power-on self-test (POST). If the router detects

a problem during the POST, the OK LED blinks in different patterns (described

in Table 3-1), depending on the problem. A pattern consists of a specific number

of blinks that is repeated until the router is turned off. If the router experiences

any of these problems, contact your Cisco reseller.

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Cisco CISCO1721 Guia de Instalação Página 57