SDN (Software-Defined Networking) controller-based DHCP (Dynamic Host Configuration Protocol) broadcast processing method

Abstract

The invention discloses an SDN (Software-Defined Networking) controller-based DHCP (Dynamic Host Configuration Protocol) broadcast processing method. The method aims to solve the problem of DHCP broadcast flooding on the basis of the SDN controller, mainly adopts a packet-out message manner to transmit DHCP broadcast packets between a source host computer and a DHCP server by caching the position of the DHCP server at the end of a controller, and meanwhile is used for recording the basic information of a host computer, which includes the IP address, MAC address and position information, when the host computer succeeds in acquiring configuration information such as the IP address. The method greatly reduces the load of the controller and network flow.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a DHCP broadcast processing method based on an SDN controller. Background technique [0002] Software-Defined Networking (SDN) is the most popular future network technology in recent years, and it is also a popular candidate network form for enterprise networks, campus networks, and data center networks. Its core idea is to separate the data plane and the control plane, and use a remote controller to centrally manage and control the network. [0003] Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DHCP) is a communication protocol that enables network administrators to centrally manage and automatically assign IP network addresses. In an IP network, each Internet-connected device needs to be assigned a unique IP address. DHCP enables network administrators to monitor and assign IP addresses from a central point. When a computer moves to ...

AI Technical Summary

Problems solved by technology

With the expansion of network scale and the increase of broadcast packet data, not only a lot of bandwidth resources are wasted, but also the controller is overloaded

[0005] The flooding method has the following disadvantages in the OpenFlow network: 1) The controller is overloaded, any broadcast data packet will be flooded to all switches in the network, and a packet-in event will be triggered on each switch, and then With the expansion of the network scale and the increase in the number of broadcast packets, it will have a huge control burden on the controller; 2) The bandwidth of the data plane is wasted, and any broadcast data packet will be flooded in the entire network, which not only increases the processing burden of the switch, but also The important thing is that a lot of valuable bandwidth resources are wasted; 3) There should be no loops in the link. Ethernet is very sensitive to loops and can easily cause broadcast storms. Most of the existing solutions use Spanning Tree Protocol to logically transform the network into A tree topology avoids loops. However, the spanning tree protocol causes a waste of network bandwidth, limits network throughput, and reduces network robustness. Once a network link fails, there will be no backup. More importantly, the switch will fail. When a fault occurs, the spanning tree recalculation process usually lasts for 30-50 seconds, which may affect normal network communication and even cause network paralysis; 4) Increase the load on the host side, and the host network card receives all broadcast packets in the network and sends them to the The CPU judges whether it is a data packet sent to the machine, and then discards or responds, wasting the computing and storage resources of the machine

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