Patent ID: 7848246

Claim:
A method of confirming an LSP (label switched path) connection by a source client in a GMPLS (global multi-protocol label switching)-based network through which the source client and a destination client are connected, the method comprising: transiting to a session ready state when receiving a message requesting a connection confirmation in an idle state; transmitting an acknowledgement message for the message requesting the connection confirmation to the GMPLS network in the session ready state and transiting to a ready-for FA (forwarding adjacency) hierarchy state; transiting to a session active state when receiving a message requesting a collection of information on the LSP in the session ready state or the ready-for FA hierarchy state; opening or closing input/output labels and transiting to an instance ready state when receiving a first message requesting switching control for labels in the session active state; transiting to an instance active state when receiving a message requesting preparation of the connection confirmation in the instance ready state; transmitting a result of the connection confirmation to the GMPLS network when receiving a packet for the connection confirmation in the instance active state.