Cisco Systems OL-11497-03 manual Using LEDs to Gather Information

Chapter 4 Troubleshooting the Installation

Problem Solving with Subsystems

•The RP sends the instructions to each line card to power up. Each line card processor begins to perform its own boot process. Each line card, through its MBus module, notifies the RP when the boot process is complete.

•The RP sends a command to each switch fabric card to power up. As each switch fabric card powers up, its progress is monitored by its MBus module processor. When the power-up process is complete, the switch fabric card MBus module notifies the RP that the switch fabric card is online.

•As the boot process progresses for each card, the status of the card is displayed in the alphanumeric LED displays. The left display is powered by the DC-DC converter on the card; the right display is powered by the DC voltage that powers the MBus module.

Using LEDs to Gather Information

By checking the state of the LEDs on the power modules and the alphanumeric displays on the RP and line cards, you can determine when and where the system failed in the startup sequence.

Note You can use the test gsr led IOS software command to perform an LED lamp test, which turns on all of the system LEDs at the same time for a specified period. This test allows you to verify that there are no failed LEDs.

The following sections describe what you should expect to see in the power module LEDs on router startup.

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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