Research On The Routing Strategy Of OTN Optical Network Based On The SRLG Separation

With the development of social science and technology, people put forward new requirements for communication technology: not only to meet the reliability of communication, but also to meet the current information of large capacity transmission. So, the optical network has been widely used because of the high reliability and large capacity transmission. With the growing dependence on information, if the network goes wrong or invalidate, great lose and great harm will be brought to the society. So guarantee the survivability of the network become an indispensable part of the network, and survivability of the network gradually become a hot topic of the study. Shared Risk Link Groups is a method that proposed based on the survivability of the network. It means the links shared with the same physical resources. The links in the same SRLG have the same risk to be failed. The protection algorithm based on SRLG is to find a couple of routes, one work route and one protection route which is satisfied with the constraint of SRLG. When the work route is failed, the protection route transmit the services.This article carried out research around the issue of “ the Technology of Routing Strategy of OTN Optical Network Based on the SRLG Separation”. We summarized several routing algorithms based on SRLG-disjointed and on its basis, proposed an improved algorithm to solve the “ trap” problem. Try to take SRLG-disjointed way for the cases that can not find any SRLG-disjointed links. Then put the improved algorithm and the original algorithm into the USA network topology, the simulation results show that the proposed algorithm can reduce the blocking rate of the network,increase capacity utilization of the network and balanced the load.