High availability path design in ring-based optical networks

Grover, W.D.

doi:10.1109/90.793028

Cited by 56 publications

(30 citation statements)

References 25 publications

(51 reference statements)

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“…The availability analysis for span restoration is therefore based on a detailed analysis of the restorability of the network to all dual span-failures scenarios. p-Cycle protection being a pre-planned survivability scheme like ring protection, the present study of path availability in p-cycle networks follows the same approach as the study in [4].…”

Section: Literature Reviewmentioning

confidence: 99%

“…These studies were conducted from the point of view of the restorability to dual-failures but no theoretical treatment of the analysis of servicepath availability has been published to date for the p-cycle scheme. The availability analysis of service paths has already been studied for ringbased networks in [4], and for localized dynamic mesh restoration-referred to as span restoration -in [5]. In [4], the availability of service is analyzed using an analytical approach that consists of determining all the combinations of dual-failures that will result in loss of service for a given path.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The availability analysis of service paths has already been studied for ringbased networks in [4], and for localized dynamic mesh restoration-referred to as span restoration -in [5]. In [4], the availability of service is analyzed using an analytical approach that consists of determining all the combinations of dual-failures that will result in loss of service for a given path. The result is a closed-form model of path unavailability based on the expressions of interring unavailability and of intra-ring unavailability.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Given this, it is vital for network operators to have an accurate idea of the expected service availability they are providing to their customers in order to be able to offer competitive SLAs without taking too much risk of paying penalties. The question of analyzing service availability has been studied in detail already for ring-based survivable networks [4], and for mesh-based survivable networks [5], but it has not been studied yet for the case of p-cycle protection.…”

Section: Introductionmentioning

confidence: 99%

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Availability Analysis and Enhanced Availability Design in p-Cycle-Based Networks

Clouqueur

Grover

2005

Photon Netw Commun

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Abstract. p-Cycle protection is a fairly new survivability scheme that has the interesting properties of offering restoration speeds essentially the same as those offered by ring protection while requiring almost as little redundant capacity as adaptive mesh restoration [D. Stamatelakis, W.D. Grover, IEEE Transactions on Communications, vol. 48, no. 8, (August 2000), pp. 1262-1265. This paper presents the first analytical consideration of the availability of paths in a network protected by p-cycles. Results confirm the importance that cycle sizes play in terms of availability and suggests principles or strategies for achieving high availability of paths in a network protected by p-cycles. Based on these insights, two new formulations for joint service path provisioning and capacity planning are proposed. The first one offers a way to improve the availability of selected service paths by using a different routing strategy for them than for regular service paths. The second formulation enables a new class of service paths that are offered two protection options instead of just one. That class of service paths is expected to see its availability improved in a quantum step way relative to the availability of paths having only one protection option.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Availability Analysis and Enhanced Availability Design in p-Cycle-Based Networks

Clouqueur

Grover

2005

Photon Netw Commun

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“…In [11], the existing p-cycle network design theory is extended to include the capability of direct restriction on protection path lengths, rather than indirect restriction through circumference limits. On the other hand, the authors of [12] developed mathematical models for path availability and provisioning resources required in various strategies for realizing high availability service paths in bidirectional line-switched rings or shared protection WDM rings. More related work by Clouqueur and Grover can be found in [6], [7], [13], [14]; in [6] and [13], the authors explain the relation between the path availability and the restorability of a network to dual failures.…”

Section: Related Workmentioning

confidence: 99%

An Alternative Approach for Enhanced Availability Analysis and Design Methods in p-Cycle-Based Networks

Mukherjee

Assi

Agarwal

2006

IEEE J. Select. Areas Commun.

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Abstract-We study the unavailability of end-to-end traffic in p-cycle based mesh networks, which are designed to protect against single link failures. It has been shown earlier by Grover and Clouqueur [6], [7] that the p-cycle length as well as its topology play a vital role in determining the availability of span(s) which are protected by the p-cycle. Similarly, we derive the relationship between the unavailability of a span(s) and the topology of the p-cycle(s) which is allocated for the restoration of the span(s). Based on these insights and on the fact that the end-to-end unavailability of a working path depends not only on the length of the restoration path but also on the number of spans along the working path, we try to design a method for allocating p-cycles such that the end-to-end unavailability is bounded by an upper limit and the upper limit can be varied as desired. As expected, results show that more capacity is required to guarantee a lower end-to-end unavailability. Our results also show that shorter service paths tend to use longer p-cycles than longer service paths, to obtain the same level of availability; this is expected since the path length, apart from the p-cycle length, also plays a role in determining the availability of the service path. We compare this formulation with a formulation which rather limits the hop count of candidate p-cycles to provide a lower end-toend unavailability. We notice that directly limiting the end-to-end unavailability, as proposed by this paper, gives better results in terms of spare capacity redundancy than limiting the hop count of p-cycles. That is because the former allows shorter working paths to use p-cycles with higher hop count and therefore a better utilization of the allocated spare capacity.

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Dynamic connection provisioning with shared protection in IP/WDM networks

Alshaer

2013

Int J Communication

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SUMMARYInternet protocol (IP) traffic connections arrive dynamically at wavelength‐division multiplexing (WDM) network edges with low data rates compared with the wavelength capacity, availability, and quality‐of‐service (QoS) constraints. This paper introduces a scheme to be integrated into the control and management plane of IP/WDM networks to satisfy the availability and QoS required for IP traffic connections bundled onto a single wavelength (lightpath) in WDM networks protected by shared‐backup path protection (SBPP). This scheme consists of two main operations: (i) routing multi‐granular connections and traffic grooming policies, and (ii) providing appropriate shared protection on the basis of subscribers’ service‐level agreements in terms of data rate, availability, and blocking probability. Using the Markov chain process, a probabilistic approach is developed to conceive connection blocking probability models, which can quantify the blocking probability and service utilization of M:N and 1:N SBPP schemes. The proposed scheme and developed mathematical models have been evaluated in terms of bandwidth blocking ratio, availability satisfaction rate, network utilization, and connection blocking probability performance metrics. The obtained research results in this paper provide network operators an operational setting parameter, which controls the allocation of working and backup resources to dynamic IP traffic connections on the basis of their priority and data rate while satisfying their requirements in terms of bandwidth and availability. Copyright © 2013 John Wiley & Sons, Ltd.

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High availability path design in ring-based optical networks

Cited by 56 publications

References 25 publications

Availability Analysis and Enhanced Availability Design in p-Cycle-Based Networks

Availability Analysis and Enhanced Availability Design in p-Cycle-Based Networks

An Alternative Approach for Enhanced Availability Analysis and Design Methods in p-Cycle-Based Networks

Dynamic connection provisioning with shared protection in IP/WDM networks

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