| With the rapid development of the internet application,gateway with single export cannot meet the growing demand for network bandwidth and stability,more and more multi-expo rt gateways have emerged.However,in many scenes,multiple single-type export links cannot meet the actual transmission requirements.For example,in the field of civil aviation,the aircraft needs to transmit flight log transmission to the ground control room when it is landing.Due to the limit of airport environment,the use of a single cel ular or Wi-Fi link may cause network interruption due to channel switch or AP coverage blindness issues.Therefore,the on-board gateway system needs to integrate multiple types of links such as Wi-Fi,cel ular networks,and Ethernet.This solution not only solves the problem of single point of failure,but also improves the parallel transmission bandwidth.Based on this,this paper studies a multi-type exports gateway which integrates different types of links such as Ethernet,WI-FI and 4G cellular network,starts from the multi-link protocol,and focuses on analyzing the multi-link load balancing technology,finally designs and implements load balancing methods of multi-type export gateways from static and dynamic perspectives.1.The achievement of static load balancing gateway system This paper builds a multi-type export gateway system based on bonding technology as well as policy routing.The system selects Ethernet,Wi-Fi,and 4G cel ular networks as export links of the gateway.Based on the actual environment characteristics,the differences in bandwidth,delay,and network tariffs are used as a measure.Focusing on the differences of factors such as bandwidth,delay,and network tariffs among different types of networks.The implementation process is as follows: Firstly,the Ethernet link is optimized by way of policy routing.Secondly,according to the difference in the actual maximum bandwidth among links,studies the key technology of bonding and impleme nts a weighted-polling load balancing strategy based on the balance-rr mode by modifying the bonding driver.Finally,impleme nts the improved bonding technology in the gateway system,which enables the traffic between the Wi-Fi and 4G cellular network links can be distributed in accordance with the maximum bandwidth ratio.Experimental results show that the gateway system can achieve reasonable traffic distribution among multiple export links according to the predetermined static load balancing policy.2.The design of dynamic load balancing method Different types of network technologies and real-time fluctuations in the network environment may lead to excessive differences in the real-time throughput of links during the transmission of multi-type egress gateways.In response to this situation,this paper proposes a dynamic bandwidth adaptive load balancing method based on one-item target iteration.Based on the idea of traffic engineering,this method cuts the traffic debris into pieces of fragments,and remaps them by detecting the current remaining bandwidth of the links,so that the gateway system can achieve load balancing among its links.The method is implemented by three algorithm modules which includes pretreatment module,quality judgment module and traffic fragment module,the iterative iteration is carried out through circular bidding algorithm.The experimental results show that after using this method,the remaining bandwidth among the various outlets tends to be consistent after mult ip le iterations,which realizes the fairness among the links in the transmission process,achieves the purpose of dynamic load balancing.In addition,the method proposed in this paper has advantages in terms of iterative speed when comparing with the existing load balancing algorithms. |
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