Message sending method and apparatus, message receiving method and apparatus, and storage medium

A message receiving method, comprising:

• receiving, by an ingress node, a Border Gateway Protocol (BGP) update message sent by an egress node to obtain routing reachability information, wherein the BGP update message comprises a tunnel encapsulation attribute, which comprises one or more pieces of tunnel encapsulation information, the tunnel encapsulation information comprising 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;
• wherein the path information of the designated virtual network comprises at least one of the following:
• a path to a designated destination node in a designated Interior Gateway Protocol (IGP) topology, a path to a designated destination node in a designated Flexible Algorithm (Flex-algo) plane, a path to a designated destination node in a designated virtual topology corresponding to a designated Slice Identifier (ID), and a path to a designated Segment Identifier (SID).

A message sending apparatus, comprising:

• a sending module, configured to send 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 comprises a tunnel encapsulation attribute, which comprises one or more pieces of tunnel encapsulation information, the tunnel encapsulation information comprising 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;
• wherein the path information of the designated virtual network comprises at least one of the following:
• a path to a designated destination node in a designated Interior Gateway Protocol (IGP) topology, a path to a designated destination node in a designated Flexible Algorithm (Flex-algo) plane, a path to a designated destination node in a designated virtual topology corresponding to a designated Slice Identifier (ID), and a path to a designated Segment Identifier (SID).