Abstract
Based on a distributed method of bit-error-rate (BER) monitoring, a novel multi-link faults restoration algorithm is proposed for dynamic optical networks. The concept of fuzzy fault set (FFS) is first introduced for multi-link faults localization, which includes all possible optical equipment or fiber links with a membership describing the possibility of faults. Such a set is characterized by a membership function which assigns each object a grade of membership ranging from zero to one. OSPF protocol extension is designed for the BER information flooding in the network. The BER information can be correlated to link faults through FFS. Based on the BER information and FFS, multi-link faults localization mechanism and restoration algorithm are implemented and experimentally demonstrated on a GMPLS enabled optical network testbed with 40 wavelengths in each fiber link. Experimental results show that the novel localization mechanism has better performance compared with the extended limited perimeter vector matching (LVM) protocol and the restoration algorithm can improve the restoration success rate under multi-link faults scenario.
Highlights
Dynamic all optical networks with GMPLS control plane is very attractive for the future core network as it can reduce the power consumption of electronic switches and be very efficient in delivering ultra large files for datacenter application and backup
Due to the huge bandwidth supported by the networks, any fault in the fiber or other component can lead to huge amount of data loss, so it is very important to incorporate efficient network monitoring, fast faults diagnosis and restoration mechanisms into the optical network
Different from the centralized and distributed fault localization mechanisms, our proposed multi-link fault localization algorithm can be performed at any node of the network based on fault fuzzy set (FFS), which is constructed with the BER information collected distributed
Summary
Dynamic all optical networks with GMPLS control plane is very attractive for the future core network as it can reduce the power consumption of electronic switches and be very efficient in delivering ultra large files for datacenter application and backup. In the paper [12], we implement fuzzy fault set (FFS) based multi-link faults localization mechanism in multi-domain large capacity optical networks. It has higher scalability, speed and success rate compared with extended LVM protocol. Different from the centralized and distributed fault localization mechanisms, our proposed multi-link fault localization algorithm can be performed at any node of the network based on fault fuzzy set (FFS), which is constructed with the BER information collected distributed. Through the BER monitoring approach and multiple faults localization mechanism, this paper proposes a novel multi-soft link faults restoration algorithm based on FFS.
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