Survivable Virtual Topology Design in Multi-domain Optical Networks

Energy efficient virtual network embedding for federated software‐defined networks

“…Some studies on virtualization in multidomain networks focused on virtual topology design in multidomain optical networks . For instance, the work in Hong et al proposed a survivable virtual topology mechanism for multidomain optical networks with the aim of minimizing total link cost of the virtual traffic requests.…”

“…Recall that s ml and t nl represent the source and terminal vertices in the augmented graph corresponding to the virtual link (m, n) in VNR l. For a given substrate node i, constraints (11) and (12) model the relationship between mnl s ml i and x ml i as well as the one between mnl it nl and x nl i . Corresponding to a particular virtual link, the virtual node that is assigned to a substrate node can be a source or a terminal vertex.…”

“…In SDN, network intelligence is logically centralized in a software‐based controller (the control plane), and network devices become simple packet forwarding devices (the data plane) . Some studies focus on multidomain SDN, also known as federated SDN, where there exist multiple domains, a controller is placed in each of the domains, and a centralized global SDN controller orchestrates local controllers to gather and distribute resource state information. Consequently, in the data plane, the switches are partitioned into multiple domains, and the controller in the control plane configures the switches in its domain via OpenFlow protocol.…”

Design of a Heuristic Topology Generation Algorithm in Multi-Domain Optical Networks

“…Figure 7 shows the second stage of the genetic operation. First, the optimal solutions of the link delay are tested in fitness function Equation (8 which means the test results pass the test of fitness function Equation (8), corresponding optimal solutions of the link delay are remained, or eliminated. In the same way, the optimal solutions of the link delay are tested in fitness function Equation (9).…”

“…For the complex topology network, someone introduces an algorithm to construct a plant topology from analyzing correlations in operations data and iteratively combining pieces of information to the final result [7]. Considering the design of survivable virtual network mapping in multi-domain optical networks, the researchers propose a heuristic algorithm for survivable virtual network mapping using a partition and contraction mechanism (PCM) and based on cut set graph theory with the objective of minimizing the total network link cost [8]. Most topology generation algorithms aim at optimizing the overall topological performance at the expense of other topological performance when concurrently optimizing some objectives.…”