Step 1
Start the configuration mode by entering the
configure terminal
command.
Example:
switch#
configure terminal
switch(config)#
Step 2
Shut down or power up the specified fabric module by entering the [
no
]
shutdown xbar slot_number
command.
Example:
switch(config)#
poweroff xbar 1
switch(config)#
Example:
switch(config)#
no poweroff xbar 1
switch(config)#
Power Modes Overview
You can configure one of the following power modes to either use the combined power provided by the
installed power supply units (no power redundancy) or to provide power redundancy when there is a power
loss:
Combined mode
This mode allocates the combined power of all power supplies to active power for switch operations.
This mode does not allocate reserve power for power redundancy in case of power outages or power
supply failures.
Power-supply (n+1) redundancy mode
This mode allocates one power supply as a reserve power supply in case an available power supply fails.
The remaining power supplies are allocated for available power. The reserve power supply must be at
least as powerful as each power supply used for the available power.
For example, if a switch requires 5.2 kW of available power and the switch has three power supplies that
each output 3-kW, then two of the power supplies provide 6.0 kW of available power and one power
supply provides 3.0 kW of reserve power in case another power supply fails.
Input-source (grid) redundancy mode
This mode allocates half of the power to available power and the other half to reserve power. You must
use a different power source for the active and reserve power sources so that if the power source used
for active power fails, the other power source used for the reserve power can provide power for the
switch.
For example, if the switch requires 5.2 kW of power, the switch has four power supplies that each output
3 kW, and there are two 220-V power grids, then you use grid A to power two 3-kW power supplies that
provide the available power to power the switch and you use grid B to power the other two 3-kW power
supplies that provide the reserve power in case grid A fails.
Cisco Nexus 7710 Switch Site Preparation and Hardware Installation Guide
71
OL-30452-01.
Managing the Switch
Power Modes Overview
