Connection level segment shared protection for dynamic multicast traffic grooming

With the rising popularity of multicasting services in meshed wavelength division multiplexing (WDM) networks, protecting dynamic sub-wavelength granularity multicast requests against network failures becomes an important issue in network operation process. This paper investigates survivable dynamic multicast traffic grooming problem in WDM networks, and a connection-level segment shared protection (CL-SSP) algorithm is proposed to protect multicast requests against single link failure in dynamic traffic grooming process. Specifically, to improve network resource sharing in traffic grooming process, a lightpath-fragmentation (LPF) method is adopted to fragment primary/backup lightpaths into segments upon setup in the physical layer routing process. Extensive numerical simulations are carried out to study the blocking performance of CL-SSP scheme in different cases. Influences of LPF method on CL-SSP blocking performance are also evaluated.