Selecting A Power Supply Mode - Cisco Catalyst 9400 System Management Configuration Manual

Selecting a Power Supply Mode

• The power requirements for the PoE exceed the PoE provided by the power supplies
Selecting a Power Supply Mode
Your switch hardware configuration dictates which power supply or supplies you should use. For example,
if your switch configuration requires more power than a single power supply provides, use the
calculator
or redundant mode.
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
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Insufficient power supplies present for specified configuration
The show power command output will also indicate this state of insufficient input power.
• If the switch has more than one power supply module, and requirements for the installed modules
still exceed the power provided by the power supplies, the following error message is displayed:
Insufficient number of power supplies (2) are installed for power redundancy mode
The show power command output will also indicate this state of insufficient input power.
If you attempt to insert additional modules into your switch and exceed the power supply, the switch
immediately places the newly inserted module into reset mode, and the following error message is
displayed:
Power doesn't meet minimum system power requirement.
Additionally, if you power down a functioning chassis and insert an additional linecard or change the
module configuration so that the power requirements exceed the available power, one or more linecards
enter reset mode when you power on the switch again.
If you have too many IP phones drawing power from the system, power to IP phones is cut, and some
phones may be powered down to reduce the power requirements to match the power supplies.
A module in reset mode continues to draw power as long as it is installed in the chassis; use the show
power module command to determine how much power is required to bring the module online.
To compute the power requirements for your system and verify that your system has enough power, add
the power consumed by the supervisor module(s), the fan trays, and the installed linecards (including
PoE). For PoE, total the requirements for all the phones.
The 802.3at-compliant PoE modules can consume up to 60W of PoE. Be sure to add 60W to your PoE
requirements for each 802.3at-compliant PoE module to ensure that the system has adequate power for
the PDs connected to the switch.
For all POE supported line cards (C9400-LC-48UX, C9400-LC-48U, C9400-LC-48P), PoE consumption
is equal to the administrative PoE.
If a powered device (PD) comsumes more power than allocated power, the following Imax error is
generated; further the port is shutdown and in a faulty state:
*Jun 21 10:06:06.149: %ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface
Gi7/0/13: Power Controller reports power Imax error
*Jun 21 10:06:06.208: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi7/0/13: PD removed
Device# show power inline 7/0/13
Gi7/0/13 auto faulty
on cisco.com to help determine the number of power supplies that is required for either combined
Environmental Monitoring and Power Management
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Cisco power