Realizing And Analyzing IS-IS MTR

IS-IS is a link-state based interior gateway protocol;it is often used in metropolitan and large Internet service provider for its relatively simple mechanism. IS-IS link does not distinguish from IPv4 to IPv6 after its supporting of IPv6, which may result in routing black hole. IS-IS MTR (Multi-topology Routing) solves this problem through decision in each topology. In this paper, one part of work is to participate in the project of IS-IS MTR development, design and implementation the MT extention in update modular (8 functions) and the function of configuring and unconfiguring MT, testify the realization by devised network and commands.Another part is two extended research on the basis of IS-IS MTR:1.If IPv6 Island exists in large scale IS-IS routing domain, analyze how to attainoptimum path when tunnels and stateless IP ICMP translation are applied to help communication among islands.We propose solutions of joint topology with IPv4 and IPv6 and new merit, which are more suitable for IPv4/IPv6 hybrid network.2.Realize static TE (traffic engineering) with MT. TE adjusts the forwarding path of flow to guarantee high level link utilization and avoid congestion. Static TE is not fit for the dynamic traffic, however, it takes consideration of all links and all flows simultaneously and globally, which is more effective in elevating Qos. We propose a solution of static TE based on MT:topology is generated adaptively founded on link load, traffic distributes in greedy way, topology generation and traffic distribution is performed alternately until anticipated link utilization is achieved. The solution is testified to be an effective TE by MATLAB simulation in random networks of different characteristics.