Cisco Nexus 9504 - Setting the Power Mode

If you do not add a power supply unit, the available power (3.0 kW) is insufficient for the switch
power requirement of 5.2 kW. The switch powers the supervisor modules, system controllers, fan
trays, and at least one fabric module before powering as many of the fabric and line cards as the
remaining available power can support (one or more fabric or line cards might not be powered).
• Scenario 2—Install an extra 3-kW power supply
If you install an extra 3-kW power supply unit that can output 3.0 kW, the available power becomes
6.0 kW. The increased amount of available power exceeds the switch power requirement of 5.2 kW,
so all the modules and fan trays in the switch can power up.
The following table shows the results for each scenario.
ResultReserve
Power
Available
Power
Power
Supply 2
Output
Power
Supply 1
Output
Power
Requirement
Scenario
Available
power is less
than the
power
requirement
for the
switch. You
cannot power
the entire
switch (some
of the line
cards will not
be able to
power up).
—3.0 kW—3.0 kW5.2 kW1
Available
power
exceeds the
power
requirement
for the
switch, so the
entire switch
can power
up.
—6.0 kW3.0 kW3.0 kW5.2 kW2
Setting the Power Mode
You can configure the power supply mode by using the power redundancy-mode command.
To display the current power supply configuration, use the show environment power command.
Note
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
68
Managing the Switch
Setting the Power Mode