Supported Platforms
Configuring the Power-On Sequence for FPCs on PTX Series Packet Transport Routers
The PTX Series Packet Transport Router chassis supplies redundant power to all FPCs. The Power Supply Modules—PSM2 and PSM3—can power up to four FPCs without redundancy. In cases where all PSMs are not present, or some Power Supply Modules (PSMs) fail or are removed during operation, service interruption is minimized by keeping as many affected FPCs online without supplying redundant power to these FPCs. For example, If there is only one PSM in the PSM2 and PSM3 slots on both Power Distribution Units (PDUs) and more than four FPCs in the chassis, then the first four FPCs as configured by the fru-poweron-sequence configuration are kept online, whereas the other FPCs are offline because of no power.
By default, Junos OS uses the ascending order of the slot numbers of the FPCs as the sequence to power on the FPCs. To configure the power-on sequence, include the fru-poweron-sequence statement at the [edit chassis] hierarchy level:
Issue the show chassis power command to view power limits and usage details for the FPCs. Issue the show chassis power sequence command to view details about the power-on sequence for the FPCs. .
If the power-on sequence is not configured by including the fru-poweron-sequence statement, Junos OS uses the ascending order of the slot numbers of the FPCs as the sequence to power-on the FPCs.
