Power-over-ethernet power method and system
In one embodiment, a method, system, and apparatus including a Power Source Equipment (PSE) device configured to provide Power-over-Ethernet (PoE) to a Powered Device (PD) that is configured to receive a request from the PD requesting a quantity of PoE power, the quantity of PoE power including an amount of power to be provided by the PSE as power for redundancy, receiving a message from the PD, the message including a unique identifier, allocating a requested quantity of PoE power, the allocating of the requested quantity of PoE power including allocating to provide the requested quantity of PoE power from one of a plurality of PSEs, and providing the requested quantity of PoE power to the PD. Related methods, systems, and apparatuses are described.
1. A method comprising:
at a first Power Source Equipment (PSE) device of a plurality of PSE devices configured to provide Power-over-Ethernet (PoE) to a Powered Device (PD) that is configured to receive PoE power:
receiving a request, sent to the plurality of PSE devices from the PD, requesting a quantity of PoE power, the quantity of PoE power including an amount of power to be provided by the PSE as power for redundancy;
receiving a message from the PD, the message comprising a unique identifier;
negotiating, in response to the request, with a second PSE device of the plurality of PSE devices via a message exchange based upon the unique identifier, a portion of the requested quantity of PoE power to provide to the PD such that the PD receives the requested quantity of PoE power from the plurality of PSE devices and less than the requested quantity of PoE power from each of the plurality of PSE devices; and
providing less than the requested quantity of PoE power to the PD based on the negotiating.
2. The method according to claim 1 wherein the message is a Link Layer Data Protocol (LLDP) Type Length Value (TLV) message.
3. The method according to claim 2 wherein the LLDP TLV message comprises a POWER_REDUNDANCY_TLV message.
4. The method according to claim 1 wherein the unique identifier comprises a MAC address.
5. The method according to claim 1 wherein the unique identifier comprises a PD serial number.
6. The method according to claim 1 wherein the message is a Cisco Discovery Protocol (CDP) message.
7. The method according to claim 6 wherein the CDP message comprises a POWER_REDUNDANCY_TLV message.
8. The method according to claim 1 wherein the PSE sends a second message to the PD acknowledging that the quantity of PoE power which was requested has been allocated to the PD.
9. The method according to claim 1 and further comprising performing power policing by one of the plurality of PSE devices to ensure that the PD is receiving the quantity of PoE power which was requested.
10. The method according to claim 9 wherein the power policing ensures that the quantity of PoE power which was requested does not exceed a maximum amount of power.
11. The method of claim 1 , wherein the first PSE device and the second PSE device are arranged within a power stack that provides power to both of the first PSE device and the second PSE device.
12. A method comprising:
at a Powered Device (PD) that is configured to receive Power-over-Ethernet (PoE) over an Ethernet cable from a plurality of Power Source Equipment (PSE) devices configured to provide PoE power over the Ethernet cable:
requesting PoE power from each of the plurality of PSE devices, the requesting of the PoE power including a request for an extra amount of power from the each of the plurality of PSE devices to provide redundancy;
sending a message to each of the plurality of PSE devices, the message uniquely identifying the PD by including a unique identifier in the message; and
receiving the PoE power from the plurality of PSE devices, wherein receiving the PoE power comprises receiving less than the PoE power from each of the plurality of PSE devices in response to a negotiation between the plurality of PSE devices.
13. The method according to claim 12 wherein the message is a Link Layer Data Protocol (LLDP) Type Length Value (TLV) message.
14. The method according to claim 13 wherein the LLDP TLV message comprises a POWER_REDUNDANCY_TLV message.
15. The method according to claim 12 wherein the unique identifier comprises a MAC address, a PD serial number, or the MAC address and the PD serial number.
16. The method according to claim 12 wherein the message is a Cisco Discovery Protocol (CDP) message.
17. The method according to claim 16 wherein the CDP message comprises a POWER_REDUNDANCY_TLV message.
18. The method according to claim 12 wherein the PD receives a second message from one or more of the plurality of PSE devices acknowledging that the requested PoE power has been allocated to the PD.
19. A Powered Device (PD) comprising:
a power circuit configured to receive Power-over-Ethernet (PoE) over an Ethernet cable from a plurality of Power Source Equipment (PSE) devices configured to provide PoE power over the Ethernet cable;
a processor;
a computer readable memory including instructions that when executed by the processor cause the processor to perform operations comprising:
requesting PoE power from each of the plurality of PSE devices, the requesting of the PoE power including a request for an extra amount of power from the each of the plurality of PSE devices to provide redundancy;
sending a message to each of the plurality of PSE devices, the message uniquely identifying the PD by including a unique identifier in the message; and
receiving the PoE power from the plurality of PSE devices, wherein receiving the PoE power comprises receiving less than the PoE power from each of the plurality of PSE devices in response to a negotiation between the plurality of PSE devices.
20. The Powered Device of claim 19 , wherein the operations further comprise receiving a second message from one or more of the plurality of PSE devices acknowledging that the requested PoE power has been allocated to the PD.