Reference Guide

Power over Ethernet | 793
In general, priority is assigned in this order:
1.
power inline [static | auto] setting: power inline static ports have a higher priority than power inline auto
ports
2.
power inline priority {critical | high | low} setting or LLDP-MED TLV, if power inline priority is not
configured
3. slot ID
4. port ID
Recover from a Failed Power Supply
If ports are PoE-enabled, and a PSU fails, power might be terminated on some ports to compensate for the
power loss. This does not affect 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 Termination
R1#show power supply
Power Model
Supply Number Type Status
------------------------------------------------
PS0 -- -- Absent
PS1 CC-C300-PWR-AC AC Active
PS2 CC-C300-PWR-AC AC Fail
PS3 CC-C300-PWR-AC AC Remote Off
PS4 -- -- Absent
PS5 -- -- Absent
PS6 -- -- Absent
PS7 -- -- Absent
0
1
2
Terminate PoE