Message forwarding method and device

The invention provides a message forwarding method and device. The method comprises the following steps: setting a plurality of two-layer interfaces connected with the same two-layer looped network as a redundancy group; setting a normally working two-layer interface of the redundancy group to be in a selected state; when a host address mapping table item is learned through a two-layer interface in a selected state in the redundancy group, setting an outbound interface of the host address mapping table item as the redundancy group and setting a trusted port identifier; updating the two-layer interface learning the selected state of the host address mapping table item to the highest priority of the redundancy group; and when the destination IP address of the received downlink three-layer message is matched with the host address mapping table item, packaging the downlink three-layer message into a downlink two-layer message based on the host address table item, and sending the downlink two-layer message through