Parallel single present system of multiple OSPF protocol execution units

The invention relates to a parallel single present system of multiple OSPF protocol execution units. The system comprises an intermediate agent unit and OSPF protocol execution units. The intermediate agent unit is a transparent logical entity and is essentially a process in a host computer, has no IP address, and is just responsible for handling all OSPF protocol messages entering and leaving the OSPF protocol execution units. Each OSPF protocol execution unit performs OSPF protocol message processing and routing calculation independently. A parallel single present system using the multiple OSPF protocol execution units includes the following step: 1, message transmission direction determination; 2, execution unit state determination; 3, character switching; 4, dynamic scheduling; 5, message classification processing; and 6, message distribution. The system has a strong fault-tolerant ability, is easy to expand and high in security and support hot plugging.