Proactive Fast Connection Recovery Scheme for a Failure in Elastic Optical Networks (original) (raw)
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A Proactive Link Based Fast Recovery Strategy for Survival Elastic Optical Networks
International Journal of Engineering and Advanced Technology, 2020
In this paper, we proposed a link based fast connection recovery strategy. A backup path either reserved in advance or searched dynamically after the failure occurred in the network. Both these recovery strategy required large backup capacity. We analyse three network parameters such as recovery time (RT), bandwidth blocking probability (BBP), and network capacity utilization ratio (NCU) for randomly generated source to destination request for three topologies that is COST239, ARPANET and NSFNET and compare the results for shared link protection (SLP), dedicated link protection (DLP), and our proposed link protection (PLP) scheme. Our proposed scheme shows the minimum RT compared to other two strategies.
Optical Fiber Technology, 2018
Spectrum conflict during primary and backup routes assignment in elastic optical networks results in increased resource consumption as well as high Bandwidth Blocking Probability. In order to avoid such conflicts, we propose a new scheme, Quasi Path Restoration (QPR), where we divide the available spectrum into two: (1) primary spectrum (for primary routes allocation) and (2) backup spectrum (for rerouting the data on link failures). QPR exhibits three advantages over existing survivable strategies such as Shared Path Protection (SPP), Primary First Fit Backup Last Fit (PFFBLF), Jointly Releasing and re-establishment Defragmentation SPP (JRDSSPP), and Path Restoration (PR): (1) the conflict between primary and backup spectrum during route assignment is completely eliminated, (2) upon a link failure, connection recovery requires less backup resources compared to SPP, PFFBLF, and PR, and (3) availability of the same backup spectrum on each link improves the recovery guarantee. The performance of our scheme is analyzed with different primary backup spectrum partitions on varying connection-request demands and number of frequency slots. Our results show that QPR provides better connection recovery guarantee and Backup Resources Utilization (BRU) compared to bandwidth recovery of PR strategy. In addition, we compare QPR with Shared Path Protection and Primary First-Fit Backup Last Fit strategies in terms of Bandwidth Blocking Probability (BBP) and average frequency slots per connection request. Simulation results show that BBP of SPP, PFFBLF, and JRDSPP varies between 18.59% and 14.42%, while in QPR, BBP ranges from 2.55% to 17.76% for Cost239, NSFNET, and ARPANET topologies. Also, QPR provides bandwidth recovery between 93.61% and 100%, while in PR, the recovery ranges from 86.81% to 98.99%. It is evident from our analysis that QPR provides a reasonable trade-off between bandwidth blocking probability and connection recoverability.
SURVIVABILITY OF BACKUP CONNECTIVITY IN OPTICAL MULTI-LAYER IP BASED CONNECTIVITY
Optical cable based network gives better solution for communication on large area networks without any distortion. The WDM based network routed data on the wired based networks; and this network affects only when disaster materialize. We grip this disaster based solution by wielding multi-layer networks approach applying on three layers i.e. Physical layer, Medium access layer and Network Layer. The physical layer interconnects the two non-identical networks through optical cable for transmission of data. The MAC layer discover the authenticate machines and different devices for casting packet data unit along with the network layer. The restoration technique exploring in this paper, for backup the data-and then restore the data through the wired network. The experimental test bed analyzes the incoming and outgoing traffic by using Open shortest path first (OSPF) protocol in the wired networks. The OSPF protocol has enhancing the performance of the wired network and distributes the load in the different edges. The failure of multi-layer in optical networks could be survived at pre-domain level. This level also balanced the load. This level uses OSPF-TE (open shortest path first-Traffic engineering) that regenerates and monitoring the traffic at boundary level.
An efficient hybrid protection scheme with shared/dedicated backup paths on elastic optical networks
Digital Communications and Networks, 2016
Fast recovery and minimum utilization of resources are the two main criteria for determining the protection scheme quality. We address the problem of providing a hybrid protection approach on elastic optical networks under contiguity and continuity of available spectrum constraints. Two main hypotheses are used in this paper for backup paths computation. In the first case, it is assumed that backup paths resources are dedicated. In the second case, the assumption is that backup paths resources are available shared resources. The objective of the study is to minimize spectrum utilization to reduce blocking probability on a network. For this purpose, an efficient survivable Hybrid Protection Lightpath (HybPL) algorithm is proposed for providing shared or dedicated backup path protection based on the efficient energy calculation and resource availability. Traditional First-Fit and Best-Fit schemes are employed to search and assign the available spectrum resources. The simulation results show that HybPL presents better performance in terms of blocking probability, compared with the Minimum Resources Utilization Dedicated Protection (MRU-DP) algorithm which offers better performance than the Dedicated Protection (DP) algorithm.
Failure independent path protection against single-SRLG failures in Elastic Optical Networks
2018
FAILURE INDEPENDENT PATH PROTECTION AGAINST SINGLE-SRLG FAILURES IN ELASTIC OPTICAL NETWORKS Hasan Gökhan Uysal MSc. in Electrical and Electronics Engineering Advisor: Ezhan Karaşan FEBRUARY 2018 In Elastic Optical Networks, flexi-grid spectrum allocation is used where the the spectrum is assigned to optical connections according to their bandwidth requirements so that the capacity is used more efficiently. Ensuring network survivability is one of the main problem in elastic optical networks. In this thesis, we study network survivability against failure of a single link or a single Shared Risk Link Group (SRLG), which is a group of links sharing a common risk of failure. We formulate the network survivability problem where the objective is to minimize the required capacity resources and maximize their efficient usage such that the elastic optical network can recover against all single-SRLG failures. We developed two formulations towards this end using flow and path formulation appr...
Practical issues for the implementation of survivability and recovery techniques in optical networks
Optical Switching and Networking, 2014
Failures in optical networks are inevitable. They may occur during work being done for the maintenance of other infrastructures, or on a larger scale as the result of an attack or large-scale disaster. As a result, service availability, an important aspect of Quality of Service (QoS), is often degraded. Appropriate fault recovery techniques are thus crucial to meet the requirements set by the Service Level Agreements (SLAs) between the carriers and their customers. In this paper, we focus on practical issues related to the deployment of fault recovery mechanisms in commercial optical networks. In particular, we outline the most important functionalities that, to our knowledge, need to be implemented, as well as discuss the related problems making deployment of fault recovery mechanisms difficult. Investigated topics include: fault recovery challenges (fault detection, location, and recovery), multiple failures recovery, as well as application of reliability mechanisms in elastic optical networks, and in multiprovider multilevel networks.
A Review on Network Survivability in Optical Networks
With the continuous advancement in technology data communication at higher data rates have become the need for the present and future technology. The data can be highly sensitive and loss of such data can hamper the communication which can cause huge loss to data, time and revenue. Thus survivability plays a very crucial role in optical networks. It is the ability of the optical network to overcome failure by pre reservation of resources (Proactive Approach) or by finding available resources after link failure (Reactive Approach) has occurred .Thus restoration of the failed link plays a very important role and is a very important area of research and efforts should be made to improve the survivability of optical networks. The objective of this paper is to analyze the existing survivability techniques.
Shared backup path protection in elastic optical networks: Modeling and optimization
Elastic Optical Network (EON) architectures are considered as a very promising solution for both huge bandwidth and flexible connection provisioning in next generation optical networks. In EON, a basic problem in network design and operation is the problem of Routing and Spectrum Allocation (RSA). In this article, we focus on offline RSA in a survivable EON scenario with shared backup path protection (SBPP). We formulate RSA/SBPP as an Integer Linear Programming (ILP) problem. Since RSA is a difficult problem itself, we propose several heuristic algorithms including both new proposals called Adaptive Frequency Assignment with Shared Backup Path Protection (AFA/SBPP) and Most Subcarriers and Average Longest Path First (MSALPF) as well as existing RSA methods adapted to the SBPP scenario. We investigate the efficiency of all algorithms for a set of network scenarios and we show that the proposed new algorithms outperform other reference algorithms. Moreover, numerical experiments show that the shared backup path protection approach enables reduction of the spectrum usage up to 28% comparing to the dedicated path protection approach without sharing of backup capacity. However, the difference between these scenarios strongly depends on the network topology and other parameters.
CLEI Electronic Journal, 2017
This paper carried out a performance evaluation study that compares two survivability strategies (DPP and SM-RSA) for elastic optical networks with and without physical layer impairments. The evaluated scenarios include three representative topologies for elastic optical network, NSFNET, EON and USA. It also analyzes the increase of blocking probability when the survivability strategies are evaluated under the realistic scenario that assumes physical layer impairments. For all studied topologies under physical layer impairments, the survivability strategies achieved blocking probability above 80%.
Comparison of failure dependent protection strategies in optical networks
Photonic Network Communications, 2006
The criticality of survivable network design and operation increases with increasing transmission speed. Path protection strategies achieve better network utilization compared to link protection strategies; however the recovery time of connections in path protection strategies are higher than that in link protection strategies. This paper evaluates and compares the performance of three failure dependent strategies: (1) failure dependent path protection; (2) link protection; and (3) Diversion-a variant of the segmented path protection approach. In addition, A framework for evaluating the connection recovery time is also developed. The protection strategies are compared for their recovery time and blocking performance using extensive simluations.