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Working with Chassis Power Budget
The power available to the chassis modules (CMM, CFM, and NI) is based on the user configuration and
system environment.
Adding additional components (e.g., NI modules, a redundant CMM, or powered POE devices)—as well as
removing power supplies—affects the overall power budget for the switch.
As soon as a component is inserted and its connectors make contact with the chassis mid-plane,
additional power requirements take effect. If there is not adequate power, the incoming component
may not power on. Additional power errors may also occur, which can interrupt data flow on the switch.
So it is important to check the current chassis power before adding a module or removing a power supply
to verify that the current chassis power supports the change.
Use the show chassis command to determine available power budget (see Power Left number).
-> show chassis
Local Chassis ID 1 (Master)
Model Name: OS9900,
Description: Chassis,
Part Number: 903722-90,
Hardware Revision: B,
Serial Number: T4720029,
Manufacture Date: Feb 1 2016,
Admin Status: POWER ON,
Operational Status: UP,
Free Slots: 4,
Power Left: 2041,
Number Of Resets: 20,
MAC Address: 2c:fa:a2:13:e4:02
In this example, 2041 watts are available for incoming components and/or powered devices.
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