Automatically Switched Optical Network (ASON) is exciting technology in next generation optical
network. And the reliable control plane plays a crucial role in creating high-level services in the transport network based
on the Generalized Multi-Protocol Label Switching (GMPLS) or Automatically Switched Optical Network. The new
survivability testbed is introduced in this paper. Different network performance parameters, especially about protection
and restoration parameters, could be collected or analyzed in this testbed.
Network survivability has been one of the key topics when researching the optical network. For network
survivability, select two routes should be selected that are disjoint when computing the working route and protecting
route or restoring route. The purpose of the shared-protection algorithms under Shared Risk Link Group (SRLG)
constraint is to search two routes that are disjoint from SRLG. Two shared-protection algorithms under Shared Risk Link
Group (SRLG) constraint will be presented; they are KWFF and IFF algorithms. In the KWFF algorithm, the K-Shortest-
Path (KSP) strategy is introduced on every wavelength plane to search usable resources adequately in the network, the
working route and protecting route on every wavelength plane can be selected from the backup route set. And with the
iterative strategy and the double weights of link, IFF algorithm could avoid the trap that can result in deteriorating the
network performance. The simulation and results analysis will be in terms of two parts, the one is from the network
performance, and other one is from the resources utilization. From the simulation results, it will be found that compared
with other algorithms, KWFF and IFF algorithms could decrease the block probability and improve the performance in
We study and test several P-Cycle generation algorithms from different strategies. The basic approach of P-Cycle algorithm is to identify an elementary cycle-set firstly, and then to search for improvements on this set through different strategies to create the final P-Cycle-set with higher efficiency. The P-Cycle generation algorithms which are presented in this paper are in terms of three aspects that are elementary cycle-set generation, expansion strategies and expansion times. At last simulation and analysis with these different algorithms will be presented.
Survivability is a new and important research area for multi-granularity optical network. In this paper, dedicated path-based protection scheme and three kinds of shared path-based protection schemes in dynamic waveband switching optical network are proposed based on the work in literature . In different shared protection schemes, different network resources, such as waveband tunnels and wavelength tunnels, are shared. Furthermore some numerical simulations of the protection algorithms are done and the results are analyzed. This work is instructive for the research of survivability schemes in multi-granularity switching optical network.
All-optical networks, employed wavelength division multiplexing (WDM), is the core part for the next generation backbone networks, the technology concerning how to make the network stronger is the key research topic on the construction of WDM networks. We study the protection mechanism for WDM works with mesh topologies and discuss the algorithms for virtual-circle protection in this paper. The algorithms discussed as following can be applied to networks with arbitrary topology, and meanwhile, avoid searching issue in the "Hamilton" circle.