Delay-Guaranteed Key Flow Routing Adjustment Algorithm

Abstract

互联网中流量分布的不均衡会导致网络拥塞、网络资源得不到有效利用.而为了负载均衡,现有算法调整路由又会造成新路径过长,服务质量降低.提出了一种路由调整算法LCBA(length-constrained most balanced algorithm),在保证时延的基础上降低网络最大带宽利用率.基于Abilene2 网络拓扑和真实流量的实验结果表明,LCBA 算法能够有效缓解骨干网拥塞,最多可以降低最大带宽利用率近50%.仿真实验结果显示:与现有算法相比,该算法能够同时满足关键流路径长度和最大带宽利用率两方面;The unevenly distributed traffic of Internet may lead to congestion and underutilization of network resources. Current methods of routing adjustment for load balancing often get a new path with excessively long length that can exacerbate the quality of service. This paper presents a new flow routing adjustment algorithm named LCBA (length-constrained most balanced algorithm), which can decrease the maximal bandwidth utilization rate of network with delay guaranteed. The experiment based on Abilene2 network topology and traffic data shows that LCBA can mitigate the congestion of backbone network effectively and the maximal bandwidth utilization rate can drease nearly 50% at most. This paper also evaluates the algorithm with an emulation method. Compared with current methods, the new algorithm can satisfy the demand of not only the length of key flow’s path but also the maximal bandwidth utilization rate. Moreover, the theoretical analysis proves that the computational complexity of LCBA is O(N2logN), which is better than that of a majority of methods nowaday.