A method for sending interface information, applied to a first network element, comprising: sending, to a second network element, at least one of: interface modes supported by a first interface of the first network element, or a current working mode of the first interface, wherein the interface modes comprise at least one of: an Ethernet mode, a Flex Ethernet, FlexE, mode, or a Metro Transport Network, MTN, mode, and the second network element is a neighboring network element of the first network element, the method further comprising: receiving, from the second network element, at least one of: interface modes supported by a second interface of the second network element, or a current working mode of the second interface; and configuring a working mode of the first interface to be a target interface mode according to the interface modes supported by the first interface and the interface modes supported by the second interface, wherein the target interface mode is an interface mode supported by both the first interface and the second interface, wherein the configuring the working mode of the first interface to be the target interface mode according to the interface modes supported by the first interface and the interface modes supported by the second interface comprises: determining at least one interface mode supported by both the first interface and the second interface; and characterized by selecting an interface mode with a highest capability rank from the at least one interface mode to be the target interface mode, and configuring the working mode of the first interface to be the target interface mode. sending, to a second network element, at least one of: interface modes supported by a first interface of the first network element, or a current working mode of the first interface, wherein the interface modes comprise at least one of: an Ethernet mode, a Flex Ethernet, FlexE, mode, or a Metro Transport Network, MTN, mode, and the second network element is a neighboring network element of the first network element, the method further comprising: receiving, from the second network element, at least one of: interface modes supported by a second interface of the second network element, or a current working mode of the second interface; and configuring a working mode of the first interface to be a target interface mode according to the interface modes supported by the first interface and the interface modes supported by the second interface, wherein the target interface mode is an interface mode supported by both the first interface and the second interface, wherein the configuring the working mode of the first interface to be the target interface mode according to the interface modes supported by the first interface and the interface modes supported by the second interface comprises: determining at least one interface mode supported by both the first interface and the second interface; and characterized by selecting an interface mode with a highest capability rank from the at least one interface mode to be the target interface mode, and configuring the working mode of the first interface to be the target interface mode. receiving, from the second network element, at least one of: interface modes supported by a second interface of the second network element, or a current working mode of the second interface; and configuring a working mode of the first interface to be a target interface mode according to the interface modes supported by the first interface and the interface modes supported by the second interface, wherein the target interface mode is an interface mode supported by both the first interface and the second interface, wherein the configuring the working mode of the first interface to be the target interface mode according to the interface modes supported by the first interface and the interface modes supported by the second interface comprises: determining at least one interface mode supported by both the first interface and the second interface; and characterized by selecting an interface mode with a highest capability rank from the at least one interface mode to be the target interface mode, and configuring the working mode of the first interface to be the target interface mode. determining at least one interface mode supported by both the first interface and the second interface; and characterized by selecting an interface mode with a highest capability rank from the at least one interface mode to be the target interface mode, and configuring the working mode of the first interface to be the target interface mode.