Power over Ethernet | 791Determine the Affect of a Port on the Power BudgetThe PoE power budget is affected differently depending on how PoE is enabled and whether a device isconnected:1. When you configure a port with power inline auto without the max_milliwatts power limit option, poweris only allocated after you connect a device to the port.• When you connect a device, the maximum power for the device class is allocated if there issufficient power in the budget. See Table 36-1 on page 785.• If there is not enough power in the budget, the configuration is maintained and the port waits forpower to become available.• If the device advertises its power requirement through LLDP-MED, then FTOS allocates therequired amount and returns the remaining amount to the budget.2. When you configure a port with power inline auto with the power limit option max_milliwatts, power isonly allocated after you connect a device to the port.• If the maximum power for the device class is less than the power limit you specified, FTOSallocates the required amount and returns the remaining amount to the budget.• If there is not enough power in the budget, the configuration is maintained and the port waits forpower to become available.• If the maximum power for the device class is more than than the power limit you specified, FTOSdoes not allocate any power.3. When you configure a port with power inline static without the power limit option (max_milliwatts),FTOS allocates 15.4W (subject to availability and priority) to the port whether or not a device isconnected.4. When you configure a port with power inline static with the power limit option (max_milliwatts), FTOSallocates the specified number of Watts.• If there is not enough power in the budget, the configuration is maintained and port waits forpower to become available.• If the maximum power for the device class is more than than the power limit you specified, FTOSdoes not allocate any power.Note: LLDP-MED TLVs are only honored if the port is configured with power inline auto (with or withoutthe max_milliwatts option).Note: When a port is configured with power inline auto (with or without the max_milliwatts option) and thePoE device is disconnected, the allocated power is returned to the power budget.
