SDN-based network topology discovery method

Abstract

The invention relates to an SDN-based network topology discovery method. The method comprises the following steps: sending a port state request to all connected SDN switches through a controller to obtain state information data of each SDN switch; packaging a private Ethernet type 0x9944 message into a Packet-out message of an OpenFlow standard through the controller, and sending the Packet-out message to all port devices of which the SDN switch port states are open; enabling the SDN switch port to receive the 0x9944 message, reassemble the 0x9944 message, and send the 0x9944 message to an adjacent SDN switch; S3, when the adjacent SDN switches in the step S3 receive the 0x9944 message, packaging the 0x9944 message into an Openflow standard Packet-in message, and sending the Openflow standard Packet-in message to the controller; using the packet-in message packaged with the 0x9944 message sent by the SDN switch for obtaining the information of port equipment through which the message passes so as to complete the link discovery of the SDN optical line terminals. According to the technical scheme, the network topology discovery method based on the SDN is low in message analysis difficulty, high in speed, high in expandability and capable of customizing a topology detection mode, and the discovery efficiency of the network topology discovery method based on the SDN is greatly improved.

Description

technical field [0001] The invention relates to the technical field of SDN switch topology display, in particular to an SDN-based network topology discovery method. Background technique [0002] LLDP (Link Layer Discovery Protocol, Link Layer Discovery Protocol) provides a standard link layer discovery method, which can organize the parameter information of the local device into different TLVs (Type / Length / Value, Type / Length / Value), and encapsulated in LLDPDU (Link Layer Discovery Protocol Data Unit, Link Layer Discovery Protocol Data Unit) published to the neighbors directly connected to themselves, after the neighbors receive the information, they use the standard MIB (Management Information Base, management information base) for the network management system to query and judge the communication status of the link. [0003] LLDP is a neighbor discovery protocol, which defines a standard method for Ethernet network devices, such as switches, routers and wireless LAN acces...

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Problems solved by technology

[0008] However, due to the long length of LLDP messages, the transmission efficiency is not good enough in large topology networks; in addition, LLDP is a standard protocol with insufficient scalability and cannot customize related message fields. Due to the length of the message is too long, there may be bandwidth congestion or even packet loss. It is precisely because of insufficient scalability that it cannot meet the business needs of different scenarios.

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