Method for transmitting link-state information

Abstract

The method is applicable to system of open shortest path first (OSPF) neighbor of establishing N number of state larger than or equal to number of minimum transmissible states between any two adjacent first router and second router in OSPF protocol, where N is natural number larger than 1. Through number at least 1 and less than N of OSPF neighbor, first router sends LSA Update message of carrying information of link state to second router. The invention reduces number of message transmitted in network, and reduces occupancy of network bandwidth resources.

Description

technical field [0001] The invention relates to network communication technology, in particular to a method for transmitting link state information between routers adopting Open Shortest Path First (OSPF) protocol. Background technique [0002] OSPF protocol is an autonomous system internal routing protocol based on link state algorithm. An autonomous system refers to a group of networks that exchange routing information with each other through a unified routing policy or routing protocol. In an autonomous system, each router adopting the OSPF protocol needs to maintain a database describing the structure of the autonomous system, and calculate the OSPF routing table according to the status information of each link of the autonomous system stored in the database, so that the In the subsequent process, packet forwarding is realized according to the OSPF routing table. [0003] It can be seen that in an autonomous system, for each router using the OSPF protocol, the state in...

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Problems solved by technology

[0014] As can be seen from the above description, in the prior art, for an ASE LSA, when N OSPF neighbors whose state is greater than or equal to ExChange and whose number is greater than 1 are established between any two adjacent routers adopting the OSPF protocol, the first router N copies of LSA Update packets carrying link state information must be sent through the N OSPF neighbors with the second router. Correspondingly, the second router must also send N LSA Ack packets, therefore, the number of packets transmitted in the network is too large, thus occupying too much network bandwidth resources

[0015] In addition, in the prior art, after the second router receives the first LSA Update message carrying link state information through an OSPF neighbor, it will still send N-1 copies of the link state information through other N-1 OSPF neighbors. The LSA Update message of the path state information is returned to the first router. Therefore, the number of packets transmitted in the network is too large, and the bandwidth resources of the network are further occupied.

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