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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 13 Environmental Monitoring and Power Management
Power Management
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.
In the first scenario (power requirements exceed the power supplied), the system attempts to resolve this
power usage limitation by evaluating the type and number of modules installed. During the evaluation
cycle, beginning from the bottom of the chassis, the system puts the modules that it is unable to support
(for lack of power) into reset mode. The supervisor engine and modules for which there is adequate
power always remain enabled, with no disruption of network connectivity. Modules placed in reset mode
still consume some power and can be removed from the chassis to further reduce power requirements. If
you configure the chassis correctly, the system does not enter the evaluation cycle.
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 engine module(s), the fan box(es), and the installed modules
(including PoE). For PoE, total the requirements for all the phones. See the “Powering Down a Module”
section on page 13-22 for more information on the power consumption for the various components of
your switch.
The 802.3af-compliant PoE modules can consume up to 20 W of PoE to power FPGAs and other
hardware components on the module. Be sure to add at least 20 W to your PoE requirements for each
802.3af-compliant PoE module to ensure that the system has adequate power for the PDs connected to
the switch.
On the WS-X4148-RJ45V PoE module, PoE consumption cannot be measured. For all PoE calculations,
the PoE consumption on this module is presumed to be equal to its administrative PoE.
Use the show module command to verify which modules are active and which, if any, have been placed
in reset.
The following example shows the show module command output for a system with inadequate power
for all installed modules. The system does not have enough power for Module 5; the Status displays it
as PwrDeny.
If the PoE that is consumed by the module is more than 50 W above the PoE you allocated using the
power inline consumption default command, the Status displays as PwrOver. If the PoE consumed by
the module is more than 50 W above the PoE module limit, the Status displays as PwrFault.
Switch# show module
Mod Ports Card Type Model Serial No.
----+-----+--------------------------------------+-----------------+-----------
1 2 1000BaseX (GBIC) Supervisor(active) WS-X4014 JAB054109GH
2 6 1000BaseX (GBIC) WS-X4306 00000110
3 18 1000BaseX (GBIC) WS-X4418 JAB025104WK
5 0 Not enough power for module WS-X4148-FX-MT 00000000000
6 48 10/100BaseTX (RJ45) WS-X4148 JAB023402RP
M MAC addresses Hw Fw Sw Status
--+--------------------------------+---+------------+----------------+---------
1 005c.9d1a.f9d0 to 005c.9d1a.f9df 0.5 12.1(11br)EW 12.1(20020313:00 Ok
2 0010.7bab.9920 to 0010.7bab.9925 0.2 Ok
3 0050.7356.2b36 to 0050.7356.2b47 1.0 Ok
5 0001.64fe.a930 to 0001.64fe.a95f 0.0 PwrDeny
6 0050.0f10.28b0 to 0050.0f10.28df 1.0 Ok
Switch#
Limitation 2
Certain configurations on the Catalyst 4507R and Catalyst 4510R chassis exceeds the maximum amount
of data power available. These configurations include the combination of the follow PIDs:
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