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Power-On Sequence for Power Redistribution

This topic includes an overview and configuration of the power-on sequence feature.

Redistribute the Available Power by Configuring Power-On Sequence

Routers running on Junos OS Release 10.0 and later support an enhanced AC Power Entry Module (PEM) to provide the necessary power infrastructure to support up to twelve higher-capacity DPCs with higher port density and slot capacity. To support the cooling requirements for the enhanced AC PEMs, the routers support enhanced fan trays and fans.

The default behavior for MPC power-on sequence is slot number based, that is, slot 0 is brought online first followed by slot 1, slot 2 up to slot 11. For the scenarios, where it is running a mix of high capacity line cards (for core facing), and low capacity line cards (for access facing) in their system, you can use the power-on sequence option to manually set the MPC power on sequence and hence ensure that the more important core facing line cards are brought online first irrespective of which slots these are in. This approach provides fine control over deterministically bringing up MPCs, however, it is heavy on configuration and entails to follow the discipline in slot to MPC mapping across all the systems.

The Junos OS enables you to configure the power-on sequence for the DPCs on chassis containing the new AC PEM. This enables you to redistribute the available power to the DPCs based on your requirements and the calculated power consumption of the DPCs. To configure the power-on sequence, refer to related information.

See Also

Configure Power-On Sequence to Redistribute the Available Power

The fru-poweron-sequence configuration enables you to redistribute the available power to the FPCs on the basis of your requirements and the calculated power consumption of the FPCs.

To configure the power-on sequence:

  1. At the [edit chassis] hierarchy level, configure the fru-poweron-sequence statement indicating the order in which the FPCs need to be powered on.

    For example:

  2. Verify the configuration by using the show command at the [edit chassis] hierarchy level:
Note:

  • If the configured sequence contains invalid numbers, Junos OS considers only the valid numbers in the sequence. The invalid numbers are silently discarded.

  • 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.

  • Issue the show chassis power command to view power limits and usage details for the FPCs.

See Also

Related Documentation