Abstract
Resource efficiency and survivability are critical concerns in elastic optical networks (EONs) with virtualization. In this paper, we investigate some important aspects in network survivability design against single-link failure under dedicated protection and bandwidth squeezing schemes when multiple virtual topologies are employed. We propose a link-path integer linear programming (ILP) formulation to solve the joint virtualization and survivability problem in elastic optical networks for large network instances, and derive some different types of protection for each virtual topology considering a channel-based spectrum approach to solve the spectrum allocation. Besides, we propose a heuristic to find a pair of predefined paths to ILP formulation aiming to minimize the link load. The proposed ILP and heuristic provide effective survivability solutions and spectrum resource savings for a cooperative design of modern survivable virtualized EONs taking advantages of a link-path model.
Highlights
S URVIVABILITY is one of the most widely studied topics on network design [1], [2]. This kind of study is certainly important for optical communications technology because of the massive amount of traffic transported by these networks, notably in the currently developed elastic optical networks (EONs) [43]
It is an example of a multi-commodity network flow problem [9], a type of problem that deals with multiple demands that need to be routed in the network simultaneously and they compete for available resources
Demand ij on virtual topology t can be embedded on the physical substrate by using a route r and a spectral channel that does not overlap with a spectral channel assigned to any other working or protection path that shares any link with r
Summary
S URVIVABILITY is one of the most widely studied topics on network design [1], [2]. This kind of study is certainly important for optical communications technology because of the massive amount of traffic transported by these networks, notably in the currently developed elastic optical networks (EONs) [43]. These two aforementioned schemes are both efficient against a single link failure and very little is known about architectures with several protection schemes against failures by the use of several slices over the same physical substrate. An important aspect for VONs ILP designing models is the dilemma of long computational running time, such as the ILP formulation from [8] for VONs design with protection It is an example of a multi-commodity network flow problem [9], a type of problem that deals with multiple demands (or commodities) that need to be routed in the network simultaneously and they compete for available resources (link capacities, in this paper).
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