Service node and inter-service node user protocol message synchronization method

A service node device, comprising a processor executing steps in message receiving module, state judging module and message sending module, wherein:

• the message receiving module, configured to:
• receive a user-related protocol message;
• the state judging module, configured to:
• judge a state of a backup group to which a user belongs corresponding to the protocol message on the service node, wherein the state is active or standby;
• and according to a type of the protocol message, determine whether to send the protocol message to another service node on which the state of the backup group is standby or active;
• and
• the message sending module, configured to:
• when determining to send the protocol message, encapsulate the protocol message through a service backup protocol and send the encapsulated protocol message to the other service node;
• wherein the state judging module is further configured to:
• when the type of the protocol message received by the message receiving module is a protocol message from an Authentication Authorization and Accounting (AAA) server, a Dynamic Host Configuration Protocol (DHCP) server or a portal authentication protocol (Portal) server, if a state of a backup group to which a user belongs corresponding to the protocol message is standby on the service node, determine to send the protocol message to the other service node on which the state of the backup group is active;
• wherein, the state judging module is further configured to:
• when the type of the protocol message received by the message receiving module is a Layer 2 Tunneling Protocol (L2TP) tunnel control message, if a state of a backup group to which a user belongs corresponding to the L2TP tunnel control message is active on the service node, determine to send the L2TP tunnel control message to the other service node on which the state of the backup group is standby.