DHT-based (distributed hash table-based) control network implementation method, system and network controller

Abstract

The invention discloses a DHT-based control network implementation method and a system. The DHT-based control network implementation method includes the following steps that switches establish control channels with specified network controllers in a distributed peer-to-peer network; the head node network controller generates a P2P (peer-to-peer) path creation request message, and the P2P path creation request message is forwarded along a path until reaching the tail node network controller; each network controller on the path issues a forwarding flow table carried by the P2P path creation request message to the switches managed by the network controller according to the P2P path creation request message, so that respective local paths are created; and according to received P2P path creation responses and local path creation results, the head node network controller determines whether paths are successfully created. The invention also discloses the network controller. According to the invention, the conditions that the network controller network can be self-organized and that the switches can automatically access the network can be ensured, and meanwhile, calculation and issue of network paths can be easily managed.

Description

technical field [0001] The present invention relates to the field of computer networks, in particular to a distributed hash (Distributed Hash Table, DHT)-based control network implementation method, system and network controller. Background technique [0002] Stanford University proposed the OpenFlow (Open Flow Table Control) protocol in 2008. The protocol adopts a forwarding / control separation architecture. The external control plane entity uses the OpenFlow protocol to control the forwarding plane devices to implement various forwarding logics. The main function of the forwarding plane device is to perform controlled forwarding according to the flow table issued by the OpenFlow network controller. Its behavior is standardized: when a packet is received, it takes out the L2 / L3 / L4 related field values ​​in its header and uses it as the The keyword searches the flow table, and after matching an entry, the packet fields are transformed according to the instruction set in the c...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that in the existing SDN distributed network controller solution, the path establishment process often involves multiple network controllers and multiple switches sending flow tables, and the complex interaction process increases the complexity of transaction maintenance. And it is not conducive to the unified state of the management plane and the forwarding plane, which greatly increases the maintenance cost of the network

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