A method for information interaction between systems in a same portal in a distributed resilient network interconnection, used in each system in a portal of a link aggregation group, comprising: sending a distributed relay control protocol, DRCP, message via an intra-portal interface, wherein at least system information of a present system is carried; after receiving a DRCP message sent by an adjacent system, if it is judged that the present system and the adjacent system can form a portal of the distributed resilient network interconnection, determining an operational Key value of the present system; after determining the operational Key value of the present system, setting up a distributed relay channel within the present system; and negotiating a unified conversation distribution way with the adjacent system; wherein before negotiating the unified conversation distribution way with the adjacent system, the method further comprises: disabling a data traffic forwarding function of an intra-portal link with the adjacent system; after negotiating the unified conversation distribution way with the adjacent system and unifying a distribution algorithm, enabling the data traffic forwarding function of the intra-portal link; wherein said negotiating a unified conversation distribution way with the adjacent system comprises: negotiating the conversation distribution way carried in the DRCP message sent by the adjacent system and the conversation distribution way of the present system, and configuring a traffic distribution way of a distributed relay within the present system in accordance with the negotiated conversation distribution way; the conversation distribution way comprises any one or a combination of the following two parameters: a gateway system selection and an aggregator/aggregation port selection. sending a distributed relay control protocol, DRCP, message via an intra-portal interface, wherein at least system information of a present system is carried; after receiving a DRCP message sent by an adjacent system, if it is judged that the present system and the adjacent system can form a portal of the distributed resilient network interconnection, determining an operational Key value of the present system; after determining the operational Key value of the present system, setting up a distributed relay channel within the present system; and negotiating a unified conversation distribution way with the adjacent system; wherein before negotiating the unified conversation distribution way with the adjacent system, the method further comprises: disabling a data traffic forwarding function of an intra-portal link with the adjacent system; after negotiating the unified conversation distribution way with the adjacent system and unifying a distribution algorithm, enabling the data traffic forwarding function of the intra-portal link; wherein said negotiating a unified conversation distribution way with the adjacent system comprises: negotiating the conversation distribution way carried in the DRCP message sent by the adjacent system and the conversation distribution way of the present system, and configuring a traffic distribution way of a distributed relay within the present system in accordance with the negotiated conversation distribution way; the conversation distribution way comprises any one or a combination of the following two parameters: a gateway system selection and an aggregator/aggregation port selection. disabling a data traffic forwarding function of an intra-portal link with the adjacent system; after negotiating the unified conversation distribution way with the adjacent system and unifying a distribution algorithm, enabling the data traffic forwarding function of the intra-portal link; wherein said negotiating a unified conversation distribution way with the adjacent system comprises: negotiating the conversation distribution way carried in the DRCP message sent by the adjacent system and the conversation distribution way of the present system, and configuring a traffic distribution way of a distributed relay within the present system in accordance with the negotiated conversation distribution way; the conversation distribution way comprises any one or a combination of the following two parameters: a gateway system selection and an aggregator/aggregation port selection. negotiating the conversation distribution way carried in the DRCP message sent by the adjacent system and the conversation distribution way of the present system, and configuring a traffic distribution way of a distributed relay within the present system in accordance with the negotiated conversation distribution way; the conversation distribution way comprises any one or a combination of the following two parameters: a gateway system selection and an aggregator/aggregation port selection.