Reference Guide

Power over Ethernet | 743
You can augment the default prioritization using the command [no] power inline priority {critical | high |
low}, where critical is the highest priority, and low is the lowest. FTOS ignores any LLDP-MED priority on
this port if you configure a priority with this command. If you do not configure a port priority with this
command, FTOS honors any LLDP-MED priority.
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 (refer to the example below).
For S-Series, refer to 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.
R1#show power supply
Power Model
SupplyNumber 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
R1#
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 (refer to Manage Power Priorities).
Ports configured with power inline auto Ports with the lowest port numbers in line cards with the lowest
slot number
3
Ports with the lowest port numbers 4
Table 39-5. PoE Ports Priorities
Configuration Port Number Priority