Chapter 4 Troubleshooting the Installation
Problem Solving with Subsystems
4-16
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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• 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.