MESSAGE SENDING METHOD AND APPARATUS, MESSAGE RECEIVING METHOD AND APPARATUS, AND STORAGE MEDIUM

Provided are a message sending method and apparatus, a message receiving method and apparatus, and a storage medium. The message sending method includes: sending, by an egress node, a Border Gateway Protocol (BGP) update message to an ingress node to notify the ingress node of routing reachability information, wherein the BGP update message includes a tunnel encapsulation attribute, which includes one or more pieces of tunnel encapsulation information, the tunnel encapsulation information including at least one of the following: a designated flow classification feature value and path information of a designated virtual network, and the tunnel encapsulation information being configured to instruct the ingress node to map, to a path of the designated virtual network, traffic which is sent to the egress node and has the designated flow classification feature value.