Troubleshooting Overview
•Processor
A line card or RP that is not firmly seated in the backplane might cause the system to hang and crash. Two
Identifying Startup Problems
Startup problems are commonly due to problems with source power or to a card that is not properly seated in the backplane.
Normal System Startup Sequence
Each card installed in the system incorporates an MBus module and at least one
When you first start up the router, the following sequence of events occurs:
•Each MBus module receives +5 VDC directly from the power supply(ies) through the backplane. When the power supply power switches are turned on, each MBus module powers up. As it does so, the MBus module processor boots from its onboard EEPROM.
•As part of the boot process, each MBus module processor reads a set of ID pins on the card. These pins, whose meaning is determined at the time of card manufacture, identify the kind of card on which the MBus module is mounted.
•In the case of the MBus modules on the CSC and the RP, the CSC MBus module processor immediately enables the card’s
If the onboard MBus module determines that it is mounted on a line card or an SFC, the MBus module remains idle for the time being, leaving the card powered down until it receives power up instructions from the master MBus module on the RP.
