Link load balancing method of SDN network and SDN controller

Abstract

The embodiment of the invention discloses a link load balancing method of an SDN network and an SDN controller, and relates to the field of communication. The link load balancing method can makes fulluse of the link resources of the SDN network and can improve the network overall performance. The link load balancing method of the SDN network comprises the steps of, by the SDN controller, calculating data links which can be used by the SDN network based on link information reported by a switch, wherein the link information comprises a link capacity; adding ports which have the same target address and correspond to the data links into a load port group and configuring the weight of a corresponding port in the load port group based on the link capacity of each data link, wherein the weight of the corresponding port is the number of the ports; obtaining a first message of a data flow sent by the switch, and obtaining the head information of the first message; performing Hash operation based on the head information to obtain a load balancing factor; selecting a forwarding port based on the load balancing factor and the weight of each port in the load port group; and generating a forwarding flow table based on the forwarding port and sending the forwarding flow table to the switch.

Description

technical field [0001] Embodiments of the present invention relate to the communication field, and in particular to a link load balancing method and an SDN controller for an SDN (Software Defined Networking, software-defined network) network. Background technique [0002] With the development of the Internet and network technology, the application business and service types are becoming more and more abundant, the number of users is increasing and the user's requirements for service quality are constantly improving, and higher requirements are put forward for the stability and reliability of the network. [0003] In the current network environment, there are generally situations where multiple links reach the same destination address at the same time. However, if traditional routing technology is used, data packets with the same destination IP address can only choose one path to complete forwarding, and other links are in backup or invalid state, resulting in link packet los...

AI Technical Summary

Problems solved by technology

Although using the ECMP algorithm can use multiple links for forwarding, for a data flow, the header information in the packet header is determined, that is, the corresponding egress link is also certain, and the ECMP algorithm is actually a static route selection. , when a link is already in a congested state, the routing result of the data flow may still be the link, further aggravating the possibility of network packet loss

[0006] To sum up, in the new SDN network architecture, the ECMP algorithm does not consider factors such as the load on the link and the link capacity (maximum load). When the link bandwidths in the ECMP group are different, it will cause problems in link load balancing. , in an ECMP group, some member links may already experience congestion and packet loss, while other links may be lightly loaded or even have no traffic. performance

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