Study On ASON Survivability Strategy

With the rapid development of optical network and the advent of ASON, The research onthe theory and application of optical network is more and more important. The introduction ofcontrol plane, the scalability of the network has got higher promotion. And the survivability ofnetwork is the guarantee to support the network working normally. Survivability is animportant technology to ensure the network performance. when there is something wrongwith the network, Survivability is used to protect and recover the damaged business, whichmakes the network work normally.This paper introduces research findings of ASON survivability at home and abroad,studies three planes of ASON network,connections and related interfaces, the basic signalingsystem, GMPLS protocols and routing are analyzed and compared. Then provides ASONsurvivability assessment system.This paper has studied ASON single domain, inter-domain and multi-layer survivabilitystrategies,explained the protection and restoration of several common methods:1+1protection,1:1protection, shared mesh protection and dynamic re-routing recovery. In thisthesis, compared these types of strategy simulation via OPNET simulation software, andgiven the advantages and disadvantages of various protection methods. Based on domains1+1protection strategy and Y-type1+1protection strategy,put forward a new protectionstrategy joint inter-domain protection strategy between Y type1+1and cross-backups,we have analyzed and simulated this protection strategy in theory. The simulation resultsshow that: the protection strategy has a good improvement in the business blocking rate andredundancy. Finally, the article has analyzed Independent multilayer survivability strategycoordination problem, discussed the parallel protection and order protection, For processinglayer to protect the motor coordination, the paper has given joint protection strategies, set inthe interlayer with a hold time timer to prevent the resulting waste of resources whichmultiple protections has been affected at the same time.