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Power over Ethernet | 789
Table 36-4 describes the fields that the show power detail command displays.
Manage Ports using Power Priority and the Power Budget
The allocation and return of power on ports depends on the total inline power available in the system and
the power priority calculation.
Determine the Power Priority for a Port
FTOS uses a sophisticated port prioritization algorithm for determining which ports receive PoE so that
PoE ports are powered up/down deterministically.
FTOS uses the following four parameters, in order, for defining the power priority for a port:
1. the
power-inline mode: static or auto,
2. the
power-inline priority configuration,
3. the LLDP-MED priority sent by the PD in the Extended Power-via-MDI TLV,
4. and the port’s slot and port number.
FTOS maintains a sorted list of PoE ports based these four parameters. Static ports have a higher weight
than auto mode ports, so all static ports always stay on top of all auto ports regardless of the other 3
parameters. Within the set of static ports, FTOS attempts to order them based on the second parameter
power-inline priority, the default of which is “Low”. If FTOS finds multiple ports with the same
Table 36-4. show power detail Field Description
Field Port Number
Unit (S-Series only) The stack member unit ID.
Catalog Name (C-Series only) Displays the component’s Dell Force10 catalog number.
Slot ID (C-Series only) Displays the slot number in which the line card or RPM is installed.
Total Power Available The total power available in the stack member or chassis.
Note: On the S-Series a maximum of 790W can be allocated for PoE, even if you add the 470W
external power supply.
Logic Power Consumed The power consumed by the system logic.
Inline Power Available
Power available for PoE (whatever was configured using
power-budget command. Default: 320
watts
Inline Power Allocated Total power allocated to the ports.
Inline Power Consumed Total power consumed by connected devices.
Inline Power Remaining Difference between power available and power allocated.