Communication method, switch, controller and communication system

Abstract

The invention relates to a communication method. The communication method comprises the following steps that: after hosts on the same network segment and different network segments are interconnected through an OpenFlow switch and an SDN (Software Defined Network) controller, the OpenFlow switch receives a first PING request message transmitted by a first host, wherein a target IP (Internet Protocol) address of the first PING request message is an IP address of a virtual gateway and a target MAC (Media Access Control) address of the first PING request message is an MAC address of the virtual gateway, the PING request message is transmitted to the SDN controller, and then a PING reply message issued by the SDN controller is issued to the first host, so that a communication link between the virtual gateway and the first host is established. After once configuration, the OpenFlow switch and the SDN controller are taken as a common default gateway of the switches on several network segments, the interconnection communication between the gateways is implemented, and communication between the hosts on the different network segments can be further implemented.

Description

technical field [0001] The invention relates to the field of communication, in particular to a communication method, a switch, a controller and a communication system for realizing the communication method. Background technique [0002] Gateway (Gateway) is also called Internet connector and protocol converter. A gateway is a network interconnection device that realizes network interconnection above the network layer. The gateway can be used for both WAN interconnection and LAN interconnection. A gateway is a computer system or device that acts as a switch between two systems that use the same or different communication protocols, data formats or languages, or even completely different architectures. The default gateway refers to a default egress gateway of an Internet Protocol (Internet Protocol, IP) subnet in the local area network. If any host in this subnet wants to communicate with hosts in other IP network segments, it will send the data packet to the default gatewa...

AI Technical Summary

Problems solved by technology

In addition, every time an IP subnet is added to the campus network, corresponding static routes and physical ports must be added in advance on the router, and VLANs or Ethernet switch devices must be added, which increases the complexity and cost of network deployment.

The existing technical solution has the problems that when the network topology changes, the deployment and migration of the network are very inflexible, the configuration is cumbersome, the maintenance is difficult, and the scalability is low.

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