Supporting power management on power-over-Ethernet (PoE) enabled ports
Embodiments of the present invention include systems and methods for controlling power delivery in a power sourcing equipment. In embodiments, a power sourcing equipment that has a higher demand for power that it can provide supplies power according to priorities assigned to the attached devices. In embodiments, the power sourcing equipment may also receive identifying information from a device connected to the port and determines whether the device is a trusted device according to a security policy. If the device is not a trusted device, the power sourcing equipment may not provide any power to the device regardless of whether power is available.
1. A computer-implemented method for controlling power of a power sourcing equipment, the method comprising:
determining, for each device connected to a port of the power sourcing equipment that supplies power, whether the device is a trusted device or a rogue device;
responsive to a determination that there is not sufficient power available to power a trusted device connected to a port of the power sourcing equipment via a cable for receiving data and electrical power and responsive to two or more devices being connected to the power sourcing equipment, determining a set of one or more trusted devices from the two or more devices that can be supplied power based upon:
a priority assigned to each of the trusted devices;
power required for each of the trusted devices; and
power available from the power sourcing equipment;
supplying power to each port corresponding to a device from the set of one or more trusted devices that is to be supplied power; and
not supplying power to each port corresponding to each device from the two or more devices connected to the power sourcing equipment that was not included in the set of one or more trusted devices that are supplied power but providing to each such port, at least some times, a detecting electrical power that is insufficient to power the device but is sufficient to detect that the device is still connected to the port.
2. The computer-implemented method of claim 1 , further comprising:
receiving from a device from the two or more devices connected to the power sourcing equipment one or more indicators containing an identity of the device; and
determining whether the device is a trusted device by comparing at least one of the one or more indicators to a security policy.
3. The computer-implemented method of claim 2 , further comprising:
responsive to a determination that the device is not a trusted device, not supplying power to the port to which the device is connected regardless of the device's priority.
4. The computer-implemented method of claim 2 , wherein the security policy includes one or more identities of devices to be denied power by the power sourcing equipment.
5. The computer-implemented method of claim 1 , further comprising:
responsive to a device not having a priority, assigning the device a priority.
6. The computer-implemented method of claim 1 , wherein a priority is applied at one or more of a per-device level, per-port level, and per-system level.
7. The computer-implemented method of claim 1 , further comprising:
responsive to the power sourcing equipment having additional power available to power a device connected via a cable to a port of the power sourcing equipment and responsive to the device being a trusted device and having a highest priority among the trusted devices not being supplied power, supplying power to the device via the port.
8. The computer-implemented method of claim 1 , further comprising:
responsive to a determination that a device not being supplied power has been disconnected from its respective port, removing it from consideration for power if additional power at the power sourcing equipment becomes available.
9. An information handling system configured to control power delivered to one or more devices connected to the information handling system, the system comprising:
a plurality of ports, each port being capable of supplying power to a device connected to a port; and
a controller for controlling power supplied by each of the ports of the information handling system and the controller configured to:
determining, for each device connected to a port of the information handling system, whether the device is a trusted device or a rogue device;
responsive to the information handling system not having sufficient power available to power all trusted devices connected to the information handling system, determine a set of one or more trusted devices that can be supplied power based upon a priority assigned to each of the trusted devices, power required for each of the trusted devices, and power available from the information handling system;
supply power to each port corresponding to a device from the set of one or more trusted devices that is to be supplied power; and
not supply power to each port corresponding to each device connected to the power sourcing equipment that was not included in the set of one or more trusted devices that are supplied power but providing to each such port, at least some times, a detecting electrical power that is insufficient to power the device but is sufficient to detect that the device is still connected to the port.
10. The information handling system of claim 9 , wherein the controller is further configured to:
receive from a device connected to the information handling system one or more indicators containing an identity of the device; and
determine whether the device is a trusted device by comparing at least one of the one or more indicators to a security policy.
11. The information handling system of claim 10 , wherein the controller is further configured to:
responsive to a determination that the device is not a trusted device, not supply power to the port to which the device is connected regardless of the device's priority.
12. The information handling system of claim 11 , wherein the security policy includes one or more identities of devices to be denied power by the power sourcing equipment.
13. The information handling system of claim 9 , wherein the controller is further configured to:
responsive to a device not having a priority, assigning the device a priority.
14. The information handling system of claim 9 , wherein the controller is further configured to:
responsive to the information handling system having additional power available to power a device connected via a cable to a port of the information handling system and responsive to the device being a trusted device and having a highest priority among the trusted devices not being supplied power, supplying power to the device via the port.
15. The information handling system of claim 9 , wherein the controller is further configured to:
responsive to a determination that a device not being supplied power has been disconnected from its respective port, remove it from consideration for power if additional power at the information handling system becomes available.
16. A power sourcing equipment (PSE) for controlling power supplied to a set of devices connected to the PSE, the PSE comprising:
a plurality of ports, each device connected via a cable to the PSE via one of the ports;
a controller for controlling power supplied by each of the ports of the information handling system and the controller configured to:
determining, for each device connected to a port of the PSE, whether the device is a trusted device or a rogue device;
responsive to the PSE not having sufficient power available to power all devices connected to the PSE:
supply power to each port corresponding to a device from a set of one or more trusted devices that is selected to be supplied power based upon a priority assigned to the trusted device, power required for the trusted device, and power available from the PSE; and
not supply power to each port corresponding to each device connected to the power sourcing equipment that was not included in the set of one or more trusted devices that are supplied power but providing to each such port, at least some times, a detecting electrical power that is insufficient to power the device but is sufficient to detect that the device is still connected to the port.
17. The PSE of claim 16 , wherein the controller is further configured to:
receive from a device connected to the PSE one or more indicators containing an identity of the device; and
determine whether the device is a trusted device by comparing at least one of the one or more indicators to a security policy.
18. The PSE of claim 17 , wherein the controller is further configured to:
responsive to a determination that the device is not a trusted device, not supply power to the port to which the device is connected regardless of the device's priority.
19. The PSE of claim 16 , wherein the controller is further configured to:
responsive to the PSE having additional power available to power a device connected via a cable to a port of the PSE and responsive to the device being a trusted device and having a highest priority among the trusted devices not being supplied power, supplying power to the device via the port.
20. The PSE of claim 16 , wherein the controller is further configured to:
responsive to a determination that a device not being supplied power has been disconnected from its respective port, remove it from consideration for power if additional power at the PSE becomes available.