A power over Ethernet method, comprising: detecting, by a power sourcing equipment, PSE, both a first set of cable pairs and a second set of cable pairs of an Ethernet twisted pair to determine that both the first set of cable pairs and the second set of cable pairs are connected to a valid powered device; receiving, by the PSE, a first link layer discovery protocol data unit, LLDPDU, from a powered device, PD, wherein the first LLDPDU comprises a load quantity type-length-value, TLV, and a power request TLV, wherein the power request TLV comprises a first required power of the first set of cable pairs and a second required power of the second set of cable pairs; wherein the PD is connected to the PSE by using the Ethernet twisted pair; determining, by the PSE, that the PD receives power from both the first set of cable pairs and the second set of cable pairs, and determining, by the PSE, that the PD comprises two PD interfaces, wherein the two PD interfaces comprises a first PD interface and a second PD interface, the first PD interface is connected to the first set of cable pairs, and the second PD interface is connected to the second set of cable pairs; if the PSE determines, according to the load quantity TLV, that the PD comprises two PD loads, wherein the two PD loads comprises a first PD load and a second PD load, sending, by the PSE, a second LLDPDU to the PD, wherein the second LLDPDU comprises a power allocation TLV, and the power allocation TLV comprises a first power that is allocated by the PSE to the first set of cable pairs and a second power that is allocated to the second set of cable pairs; supplying, by the PSE, power to the first PD load at a first power by using the first set of cable pairs, and supplying power to the second PD load at a second power by using the second set of cable pairs, wherein the first PD load is connected to the first PD interface and obtains power through the first PD interface, the second PD load is connected to the second PD interface and obtains power through the second PD interface, wherein the first power and the second power are independent of each other. detecting, by a power sourcing equipment, PSE, both a first set of cable pairs and a second set of cable pairs of an Ethernet twisted pair to determine that both the first set of cable pairs and the second set of cable pairs are connected to a valid powered device; receiving, by the PSE, a first link layer discovery protocol data unit, LLDPDU, from a powered device, PD, wherein the first LLDPDU comprises a load quantity type-length-value, TLV, and a power request TLV, wherein the power request TLV comprises a first required power of the first set of cable pairs and a second required power of the second set of cable pairs; wherein the PD is connected to the PSE by using the Ethernet twisted pair; determining, by the PSE, that the PD receives power from both the first set of cable pairs and the second set of cable pairs, and determining, by the PSE, that the PD comprises two PD interfaces, wherein the two PD interfaces comprises a first PD interface and a second PD interface, the first PD interface is connected to the first set of cable pairs, and the second PD interface is connected to the second set of cable pairs; if the PSE determines, according to the load quantity TLV, that the PD comprises two PD loads, wherein the two PD loads comprises a first PD load and a second PD load, sending, by the PSE, a second LLDPDU to the PD, wherein the second LLDPDU comprises a power allocation TLV, and the power allocation TLV comprises a first power that is allocated by the PSE to the first set of cable pairs and a second power that is allocated to the second set of cable pairs; supplying, by the PSE, power to the first PD load at a first power by using the first set of cable pairs, and supplying power to the second PD load at a second power by using the second set of cable pairs, wherein the first PD load is connected to the first PD interface and obtains power through the first PD interface, the second PD load is connected to the second PD interface and obtains power through the second PD interface, wherein the first power and the second power are independent of each other.