Chapter 4 Troubleshooting the Installation
Identifying Startup Problems
Identifying Startup Problems
Startup problems are commonly due to power source failures or to a card not properly seated in the backplane. Although an overtemperature condition is unlikely at initial startup, the environmental monitoring functions are included here because they also monitor internal voltages.
When you start up the router for the first time, you should observe the startup sequence. The normal startup sequence is as follows:
•Each card in the system has an MBus module and at least one
•The consolidated switch fabric (CSF) containing the system clock, immediately powers up.
•The MBus module on the RP monitors the progress of the clock and scheduler card power on. When the CSF has powered up, the MBus module on the RP turns on its
•The RP sends instructions to each line card to power up. Each line card processor begins to perform its own boot process and notifies the RP when the boot process is complete through its MBus module.
•As the boot process progresses for each card, the status of the card is shown on the alphanumeric LED displays. The left display is powered by the
By checking the state of the LEDs on the power supplies and the alphanumeric displays on the RP and line cards, you can determine when and where the system failed in the startup sequence.
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