SURVIVABILITY OF BACKUP CONNECTIVITY IN OPTICAL MULTI-LAYER IP BASED CONNECTIVITY (original) (raw)
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Restoration in IP over WDM optical networks
Proceedings International Conference on Parallel Processing Workshops, 2001
An important requirement in any high speed network is to ensure the network's survivability, i.e., the ability to provide reroutes of ongoing connections after the failure of network components. We consider the problem of embedding an IP layer topology in the WDM transport network layer with the objective of achieving the network's survivability in the IP layer. Specifically, we consider the problem of embedding an arbitrary IP layer topology in a WDM wavelength-routing ring network such that the IP topology remains connected under the presence of the failure of any link in the WDM layer.
Journal of Lightwave Technology, 2002
This paper proposes and analyzes a strategy for protection and restoration of optical paths in wavelength division multiplexing (WDM) networks for next-generation Internet infrastructure. Assuming a network model in which a multiprotocol label switching (MPLS) layer is overlaid on top of a WDM layer, and a segregation of the traffic on a wavelength basis, the strategy is based on a network dimensioning aiming at: 1) the support of different types of traffic, relating to different service categories; 2) the guarantee that all the wavelength paths carrying mission-critical services (with stringent quality of service requirements) are protected against failure; and 3) the possibility of restoring a large amount of wavelength paths carrying Internet best-effort services, i.e., low-priority (LP) preemptible traffic with no QoS requirements. The reference network scenario is an overlay model in which the optical network interacts with an MPLS network with a separated control plane; the optical network manages its resources to better serve the traffic coming from the MPLS network. Two path protection schemes, namely, disjoint path (DP) and single-link basis (SLB), and a link protection mechanism, namely, local repair (LP), are investigated. Furthermore, the paper considers both the case of using wavelength conversion in the optical nodes and the case in which wavelength conversion is not used at all. The analysis compares the performance of the different strategies in terms of the percentage of optical paths carrying LP traffic not served by the optical network after a failure and of the dimensions of the optical nodes for all the schemes. The analysis reveals that the proposed approach allows the restoration of a large amount of best-effort traffic with a reasonable increase of network redundancy.
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.
Restoration approach in WDM optical networks
Optik, 2007
Critical applications require proactive-based survivability strategy which provides 100% degree of survivability, low blocking probability and very low restoration time. In this paper, we have proposed an efficient proactive restoration approach for WDM optical network that efficiently utilizes the resources and reduces blocking probability as compared to existing proactive restoration approach. It gives priority to primary lightpath as compared to backup lightpath because primary lightpath should not share resources with other lightpaths in critical applications but backup lightpaths can share the resources, i.e. backup multiplexing.
Protection and Restoration Schemes in Optical Networks: A Comprehensive Survey
Fault management has become critical in managing survivability of high speed networks. Impact of failure is aggravated with extremely high volume of traffic carried on WDM (Wavelength Division Multiplexing) networks. In a WDM network, failure of a network element may cause failure of several optical channels leading to large data loss which can interrupt communication services. In this paper, existing protection and restoration techniques proposed for optical network are critically reviewed and analyzed. It is concluded that a hybrid of existing protection schemes can be implemented depending on service differentiation, type of optical network and tradeoffs in speed, efficiency, restoration time and cost. Existing work has to be expanded on incorporating intelligence in Optical Networks which can result into efficient management of faults thereby providing protection and restoration.
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.
Lightpaths routing for single link failure survivability in IP-over-WDM networks
Journal of Communications and Networks, 2007
High speed all optical network is a viable option to satisfy the exponential growth of internet usage in the recent years. Optical networks offer very high bit rates and, by employing technologies like internet protocol over wavelength division multiplexing (IP-over-WDM), these high bit rates can be effectively utilized. However, failure of a network component, carrying such high speed data traffic can result in enormous loss of data in a few seconds and persistence of a failure can severely degrade the performance of the entire network. Designing IP-over-WDM networks, which can withstand failures, has been subject of considerable interest in the research community recently. Most of the research is focused on the failure of optical links in the network. This paper addresses the problem of designing IP-over-WDM networks that do not suffer service degradation in case of a single link failure. The paper proposes an approach based on the framework provided by a recent paper by M. Kurant and P. Thiran. The proposed approach can be used to design large survivable IP-over-WDM networks.
Multi-layer Network Recovery: Avoiding Traffic Disruptions Against Fiber Failures
Lecture Notes in Computer Science, 2006
The next generation backbone networks, optical IP/MPLS networks, enable increasingly higher volumes of information to be transported. In this network architecture, a fiber failure can result in a loss of several terabits of data per second and leads to multiple failures in the upper network layer. Thus, the ability of the network to maintain an acceptable level of reliability has become crucial. In this paper, a dynamic cooperation between packet and wavelength switching domain is considered in order to provide protected paths cost effectively. A new multi-layer routing scheme that incorporates recovery mechanisms in order to guarantee connectivity against any single fiber failure is presented.
Survivability reconfigurable techniques in optical network
Journal of Information and Optimization Sciences, 2019
Survivability plays a vital role against to stop the failure. It results the demand distribution in Optical Networks through different communication services like data voice and video by using huge bandwidth. In this paper Techniques for Survivability of Optical Networks through Network Configuration is presented Hence the centralized and non-centralized demand distribution in Optical Networks through different communication services like data voice and video by using huge bandwidth. In this paper Techniques for Survivability of Optical Networks through Network Configuration is presented. Hence these techniques are evaluated by using the parameters such as Traffic Characterization (TC), Traffic Protection and Restoration (TPR), Network Path Configuration and Network Integration w.r.t. Physical Layer(PL) and Logical Layer(LL) problem formulation(s) are discussed. Hence the survivability of fiber Optic Network play a vital role for NXN connectivity. Reconfigurable implies Optical Network Services Utilization Factor(ONSUF) is estimated through the local and global connectivity scenario.