MPLS网络中基于TeXCP的QoS路由算法

QoS Routing Algorithm Based on TeXCP over MPLS Network

为了能在有严格带宽要求和有弹性带宽要求两种业务共存的MPLS(multi-protocol label switching)网络中提供动态负载均衡,提出了一种基于负载平衡算法——TeXCP(traffic engineering with explicit congestion control protocol)的QoS路由算法.该算法利用TeXCP的自动调节和平衡负载的能力将best effort业务调整到适当的路径上以满足高优先级QoS业务请求的带宽,同时避免了传统的快速重路由方法可能导致的网络拥塞问题.仿真结果表明,新算法能够集成两类业务需求,通过平衡瓶颈链路的利用率减小了网络的拥塞,在保证QoS业务带宽要求的同时,提高了网络的吞吐量.

To provide dynamic load balance for MPLS networks which contain both bandwidth-guaranteed traffic and best effort traffic, a QoS routing algorithm is proposed based on traffic engineering with explicit congestion control protocol （TeXCP）. The new routing algorithm can adjust best effort traffic automatically to reach a multi-path load balance and provide bandwidth guarantee for QoS traffic. When two classes of traffic compete for link bandwidth, the requirement of QoS traffic is first guaranteed, and then, packets of best effort traffic are adjusted dynamically to achieve load balance and to avoid congestion. The simulation results show that the new routing algorithm can integrate best effort traffic and QoS traffic effectively, while providing bandwidth guarantee for QoS traffic, the congestion situation is improved and the network throughput is increased.