Three-layer topology determining method and device in SDN network

Abstract

The invention discloses a three-layer topology determining method and device in an SDN network. The method includes the steps that an SDN controller receives a first LLDP message from a first network device, and the first LLDP message is packaged in first Packet-in information; the first LLDP message carries three-layer VLAN interface information of a second network device; the SDN controller receives a second LLDP message from the second network device, and the second LLDP message is packaged in second Packet-in information; the second LLDP message carries three-layer VLAN interface information of the first network device; the SDN controller determines the three-layer topology between the first network device and the second network device by means of the three-layer VLAN interface information of the second network device and the three-layer VLAN interface information of the first network device. According to the three-layer topology determining method, the SDN controller determines three-layer topologies between all the network devices by means of the three-layer VLAN interface information of all the network devices.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for determining a three-layer topology in an SDN (Software Defined Network, software-defined network) network. Background technique [0002] SDN (Software Defined Network, Software Defined Network) network is a new type of network innovation architecture. Its core idea is to separate the control plane of network equipment from the forwarding plane, so as to realize flexible control of traffic, and provide core network and application innovation. good platform. In an SDN network, it includes network devices (such as switches) and SDN controllers. The SDN controller is used to generate a flow table (Flow Table) according to the user's configuration or a dynamically running protocol, and send the flow table to the network device. The network device is used to receive the flow table from the SDN controller, and match and process packets according ...

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Problems solved by technology

[0004] In the prior art, the SDN controller can only obtain the physical topology between each network device, and calculate the forwarding path for each network device according to the physical topology, but cannot obtain the three-layer topology between each network device, resulting in the SDN controller The forwarding path cannot be calculated for each network device based on the three-layer topology

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