基于MPLS的流量工程研究

【作者】 张雷；

【导师】 梁建武；

【作者基本信息】 中南大学 ， 通信与信息系统， 2007， 硕士

【摘要】 IP网络是无连接网络，它存在两个重要缺陷：其一各个节点独立转发报文容易导致网络拥塞；其二它没有QoS保证因而无法提供各种实时业务。流量工程作为一种间接实现QoS机制，它可以优化网络资源的利用，处理网络拥塞，并能够解决链路和节点的失效问题。在IP网络中实施流量工程便可以解决上述缺陷，MPLS技术提供的显式路由技术使得流量工程可以方便在IP网络中实施。本文对基于MPLS的流量工程进行了研究，首先阐述了实施流量工程的必要性和可行性，分析了流量工程的结构模型和数学模型，然后介绍了流量工程相关的网络流理论和MPLS域内流量工程的组成部件等。论文注重于域内流量工程路由问题的研究，分析了域内流量工程的几种路由算法的优缺点，提出一种实现最小干扰路由的启发式算法，并在此基础上结合流量轮廓和最小化最大带宽利用率思想提出了一种有效的域内流量工程路由算法。仿真表明，与其他算法相比该算法能进一步优化网络资源的利用。对于域间流量工程，介绍了现阶段域间流量工程的实施难点，通过研究当前的域间流量工程实现的最新技术，提出了一种可行的基于MPLS的域间流量工程实施方法，该方法是在扩展现有BGP和IGP协议的基础上实现的，它为完善域间流量工程的应用提供了一种新的思路。最后，本文指出了MPLS流量工程还需要进一步研究和解决的问题。更多还原

【Abstract】 IP network is non-connective, there are two vital disadvantages in IP network, that is, first, packets are forwarded by nodes independently so it is likely to beget congestion; second, it is without QoS guarantee and the real-time services can not be provided. Traffic Engineering is one of the mechanisms of realizing QoS, it performs network resource optimization, handles the congestion and provides fast recovery when the link or node is failure. The vital disadvantages of IP network will be solved when the Traffic engineering is deployed. The explicit routing feature of MPLS facilities the traffic engineering.The paper studies MPLS-based traffic engineering. It introduces the necessary and possibility of deploying traffic engineering and analyzes the structure model and mathematic model of traffic engineering. The theory of network flow about traffic engineering and the components of MPLS intra-traffic engineering are introduced. The paper focuses on the study of intra-domain routing algorithm, it analyzes the advantage and shortcoming of several intra-domain routing algorithm and a new method for minimum interference routing is proposed. Combining this method an improved routing algorithm for intra-domain traffic engineering based on traffic profile and minimize maximum bandwidth utilization is presented. The simulation shows that it can further optimize the resource utilization. The difficulties of deploying the inter-domain traffic engineering are introduced. Based on the research of the new technology of inter-domain traffic engineering, a new solution of deploying the MPLS-based inter-domain traffic engineering is presented and this solution based on extending present interior gateway protocol and border gateway protocol provides a new method to perfect inter-domain traffic engineering.The future research areas of MPLS Traffic Engineering are mentioned at the end of this paper.更多还原