A power over Ethernet method, comprising: detecting and determining, by a power sourcing equipment, PSE, that both a first set of cable pairs and a second set of cable pairs of an Ethernet twisted pair 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 the load quantity TLV is used to notify a quantity of PD loads comprised in the PD; wherein the PD is connected to the PSE by using the Ethernet twisted pair; wherein the first LLDPDU further comprises a power request TLV, and 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; and in a case in which the PSE determines (603, 604) that the PD receives power from both the first set of cable pairs and the second set of cable pairs, and 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; and supplying, by the PSE, power to the first PD load at the first power by using the first set of cable pairs, and supplying power to the second PD load at the 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 from the first PD interface, the second PD load is connected to the second PD interface and obtains power from the second PD interface, wherein the first power and the second power are independent of each other. detecting and determining, by a power sourcing equipment, PSE, that both a first set of cable pairs and a second set of cable pairs of an Ethernet twisted pair 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 the load quantity TLV is used to notify a quantity of PD loads comprised in the PD; wherein the PD is connected to the PSE by using the Ethernet twisted pair; wherein the first LLDPDU further comprises a power request TLV, and 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; and in a case in which the PSE determines (603, 604) that the PD receives power from both the first set of cable pairs and the second set of cable pairs, and 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; and supplying, by the PSE, power to the first PD load at the first power by using the first set of cable pairs, and supplying power to the second PD load at the 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 from the first PD interface, the second PD load is connected to the second PD interface and obtains power from the second PD interface, wherein the first power and the second power are independent of each other.