The OSI Conference Layer Protocol ISO-SP supports session management, such as opening and closing a session. If the connection is lost, the protocol provides the recovery connection function. If the connection period is not long, the session layer turns off the connection while reopening the new connection session. The above operation procedure is transparent to the high-level protocol. The session layer supports Synchronization Point in the exchange package stream.
The session protocol mechanism SPM is an abstract mechanism for implementing the session layer protocol specified program, and implements communication between the session service user SS-User through the session service access point SSAP service primitive. By establishing a transport connection, the serving primitive will cause or lead to session protocol data units between peer SPMS. These protocols are exchanged through the transport layer service.
The session connection endpoint is identified by the domestic independent implementation mechanism to implement the end system, so SS-USER and SPM can check each session connection.
The session layer function fills the vacancies that the transport layer can use the service and is necessary for SS-User.
The session layer function is related to dialogue management, data stream synchronization, and data stream resynchronization.
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