Due to the network's complexity, the network simulation is essential for the development and analysis of
internetworking technology. The simulation needs to be performed on certain network topology, which requires the
topology generator to generate topology that is similar to real network. The network topology generator evolves from the
random model to the hierarchical model, and then to the power-law model. Based on the presentation and analysis of
existing topology generators, a novel hybrid topology generator is proposed. The principle of this generator is to divide
the network into two hierarchies, and then generate the inter-domain topology based on the power-law model and the
intra-domain one on the Waxman model. It is shown that the topologies generated by the proposed generator are more
similar to real network than the existing generators.
IP/WDM traffic grooming is a scheme that let different fine-grained IP layer Packet Label Switched Paths efficiently
share the coarse-grained WDM layer lightpath. Choosing those nodes with high nodal degree as the terminals of
lightpaths can save the transfer times of Packet LSP, thus on average each lightpath can hold more service to achieve
better resource utilization and network throughput. To improve the resource utilization, this paper proposes the
Topology-Based Lightpath Establishment Algorithm (TBLEA) which employs network topological characteristics to
build more efficient lightpaths whose terminals are with high nodal degree. In the algorithm, a long lightpath, which is
potentially less efficient, might be cut into several shorter lightpaths based on the topology characteristics and remaining
resource of nodes in the primer lightpath. The algorithm has the advantages that not only the terminal nodes but also the
length of new lightpath can promise to improve the PSC and LSC resource utilization. In the implementation of the
TBLEA algorithm, a two-layer virtual graph helps to calculate the explicit integrated route to build Packet LSP, and
different formulas are adopted to calculate the total costs of existing lightpaths and new lightpaths. A long lightpath
might be cut into shorter lightpaths on the basis of the node weight, which is determined by the nodal degree and relative
remaining resources. And iterative procedures offer the loop-free optimization of the changed explicit route for Packet
LSP.
As WDM technology becomes mature, the number of wavelengths in WDM systems continues to increase, which will
increase the complexity and costs of the switching fabrics in OXCs. As a result, multi-granularity (MG) optical network
is introduced, which will significantly reduce the provisioning cost in optical domain. An important network design
problem in MG networks is to provide survivability in the event of a failure. In this work, two shared protection
schemes called SPPB (shared protection per bandpath) and SPPL (shared protection per lightpath) are proposed for
protecting lightpaths against single link failure in multi-granularity optical networks. Some GRWA algorithms for SPPB
and SPPL are also proposed. Analysis and simulation are performed to evaluate these protection schemes.
NTT has proposed a photonic MPLS router (PMR) to support IP over optical layer networks. There are two routing policies implemented in PMR, which both consider IP layer and optical layer resource separately. We found in the PMR architecture, PSC port is significant resource. In this paper, we propose an adaptive routing policy for PMR. Our routing policy has two features: integrated routing and PSC port number sensitive. Simulation results show that the adaptive routing policy has a better overall performance in resource utilization.
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