This application provides an IAB network includes a first BAP topology and a second BAP topology, the first BAP topology is managed by a first donor node, the second BAP topology is managed by a second donor node. In the IAB network, a first IAB node receives a first data packet, where the first IAB node is managed by the first donor node, at least one parent node of the first LAB node is managed by the second donor node, and the first IAB node belongs to the first BAP topology. The first IAB node processes the first data packet based on a BAP topology corresponding to an ingress link for receiving the first data packet.