MILP formulation for resource optimization in Spectrum-Sliced Elastic Optical Path Networks

Optimal Design for Shared Backup Path Protected Elastic Optical Networks Under Single-Link Failure

“…Most of the studies performed for the design and performance evaluation of this type of network [3][4][5][6][7][8][9][10][11][12][13][14] have focused on unprotected lightpath services. Only some [15][16][17][18][19][20][21][22][23][24][25] have dealt with the design of survivable elastic optical networks even though survivability would be of paramount importance in an optical transport network that carries a large amount of traffic.…”

Network Virtualization Over Elastic Optical Networks With Different Protection Schemes

“…This generates cost-effective restoration in terms of spectral resource utilization, which increases the number of surviving paths for the missioncritical data when there are insufficient backup resources in a disastrous failure situation. The authors in [15] developed a scheme similar to [14], but aimed to protection purpose, which is referred to as Partial Protection: after any single link failure, the flow can drop to the partial protection requirement, where a fraction of the demand is guaranteed to remain available between the source and destination after any failure. However, these works have not addressed the problem of providing different protection characteristics for each virtual topology.…”

“…Due to the complexity of solving the MILP formulation for large networks, we performed experiments just with the algorithm-based heuristics for a moderate large network (NSFNET, [15]) with 14 nodes and 21 links. We use DP and MP protection schemes with the four cases described in Table V to compare their performance. First of all, we recognize that it may be impractical to use the proposed VON-SF heuristic with networks of reasonable size.…”

“…In particular, we take, for each virtual topology, one of these two different protection schemes: Squeezing Protection [14], Network Virtualization over Elastic Optical Networks with Different Protection Schemes K.D.R. Assis, S. Peng, R. C. Almeida Jr, H. Waldman, A. Hammad, A. F. Santos and D. Simeonidou C [15] (with different squeezing rates for each virtual topology) and Dedicated Protection. No Protection is also assessed for comparison purposes.…”

A Resource Efficient Recovery Strategy for a Failure in Elastic Optical Networks

“…This alternative backup route may be provisioned at the time of connection setup or it is dynamically searched after the failures occurred. There are two types of resource recovery schemes, one is advance reservation (AR) and other is immediate reservation (IR), in AR the backup resources are reserved in advance at the time of connection setup, whereas in IR the alternate backup route is dynamically searched after the failure information received at the source node [7] [8].…”