Patent ID: 8208469

Claim:
A communication system which is a transmission system using MPLS (Multi Protocol Label Switching) tunneling and label technology to map a communication service to the MPLS, thereby providing bidirectional services on an end-to-end basis, comprising: a provider edge router to perform label assignment control for the bidirectional services; to transmit, after completion of the assignment control, a second message in which a first message used in the assignment control is a payload and a tunnel-directed label used by the bidirectional services is a header; to associate, on the basis of the received first message used in the assignment control, a service-directed label included in the corresponding first message with the received tunnel-directed label, in the part where the second message is terminated; to analyze the first message to determine the presence of a message having the same forwarding attribute in the label assignment; and to obtain correspondence between a label which identifies a customer service transmitted from a first end to a second end and a label which identifies a customer service transmitted from the second end to the first end, when the determination is achieved.