Reference Guide

802 | Power over Ethernet and Power over Ethernet Plus

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Recover from a Failed Power Supply

If ports are PoE/PoE+ -enabled, and a PSU fails, power might be terminated on some ports to compensate

for the power loss. This does not affect PoE/PoE+ individual port configurations.

For C-Series, use the

show power supply command to display PSU status (Figure 36-4).

For S-Series, see the Power over Ethernet (PoE) chapter in the FTOS Command Reference for the S-Series

for an example of the output of the

show power inline output and its field descriptions.

Figure 36-4. show power supply Command Example

If power must be terminated for some ports, the order in which ports are affected is based on priority. Ports

with the lowest priority are terminated first (see Manage Power Priorities).

Figure 36-5. Order of PoE/PoE+ Termination

For the configuration in Figure 36-2:

• Power for ports 7/1 and 7/2 is terminated first because it is configured with

inline power auto.

• Power for port 7/2 is terminated before PoE/PoE+ for port 7/1 because port 7/1 has a lower port

number.

• Power for port 7/0 is terminated last because it is configured with

inline power static.

FTOS#show power supply

Power Model Line

Supply Number Type Status Mode

--------------------------------------------------------------------------------

PEM0 CC-C-1600W-AC AC Active High(1600W)

PEM1 CC-C-1600W-AC AC Active High(1600W)

PEM2 CC-C-1600W-AC AC Active High(1600W)

PEM3 Absent

PEM4 Absent

PEM5 Absent

PEM6 Absent

PEM7 Absent

FTOS#

Terminate PoE