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Dynamic Power Management for Better Power Utilization

You can use the dynamic power management feature to better utilize the power available in the power entry module (PEM). Whether or not a new hardware component is powered on depends on the availability of power in the PEM. A component is not powered on if the PEM cannot meet the worst-case power requirement for that component.

The maximum power that each type of MIC consumes is maintained in a static database. The chassis daemon process (chassisd), which manages power budgeting for all line cards, uses this data when budgeting power for MICs. MICs are brought online only after the chassis daemon verifies that the worst-case power required for the MICs and the power required for all the online FRUs (Field Replaceable Units: Replaceable or swappable Junos device and device parts ) are available in the PEM.

To enable dynamic power management on devices with this feature disabled by default, use the mic-aware-power-management statement at the [edit chassis] hierarchy level. When dynamic power management is disabled, the chassis daemon checks for the worst-case power requirement of the MPC and the MICs before allocating power for the MPC. Whereas, when mic-aware-power-management statement is enabled, the chassis daemon considers the power requirement of only the MPCs. The worst-case power consumption by the MICs is not considered while the chassis daemon budgets power for the MPC. Power budgeting for MICs is done only after the MPC is powered on and the MICs come online. Every time you disable or enable dynamic power management, you must restart the chassis or the MPC for the changes to take effect.

Dynamic power management for MICs is not supported on JNP10K-LC2101 because JNP10K-LC2101 is a fixed configuration MPC and supports only built-in PICs.

After you enable the dynamic power management feature, use the set chassis preserve-fpc-poweron-sequence configuration mode command to preserve the sequence in which MPCs are powered on. This configuration is required to maintain the order in which the MPCs come online after a router or switch restart.

Change History Table

Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.

Release
Description
18.2R1
Starting from Junos OS Release 18.2R1, for JNP10K-LC2101 MPC on MX10008 routers, dynamic power management is enabled by default.
17.3R1
Starting from Junos OS Release 17.3R1, for MX10003 routers, mic-aware dynamic power management is enabled by default.
17.2R1
Starting in Junos OS Release 17.2R1, EX9200 switches support dynamic power management.
17.2R1
In Junos OS Release 17.2R1, for EX9200 switches, dynamic power management for MICs is enabled by default.
15.1R1
Starting in Junos OS Release 15.1R1, MX Series routers support dynamic power management.
15.1R1
In Junos OS Release 15.1R1, for MX Series routers, dynamic power management for MICs is disabled by default.
15.1F5
In Junos OS Release 15.1F5 and later, dynamic power management is enabled by default on several MPCs. Models include MPC3E-3D-NG, MPC3E-3D-NG-Q, MPC2E-3D-NG, MPC2E-3D-NG-Q, MPC6E, MPC7E-MRATE, and MPC7E-10G on MX240, MX480, MX960, MX2010, and MX2020 and on MPC8E and MPC9E on MX2010, and MX2020 Universal Routing Platforms.