High availability survivable networks: When is reducing MTTR better than adding protection capacity?

Grover, W.D.; Sack, A.

doi:10.1109/drcn.2007.4762261

Cited by 14 publications

(10 citation statements)

References 9 publications

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“…A few attempts to provide mathematical models relating cost and availability have appeared in the literature. Grover and Sack [6] proposed to model the reduction of the mean-time-to-repair (MTTR) and the associated cost in terms of % of budget for improving availability as having an inverse relationship of the form Cost = (M T T R o /M T T R) 1/α where M T T R o is the baseline mean-time-to-repair and α is a parameter. Recently [15], models the cost of increasing the mean-time-between-failure (MTBF) as polynomial function of MTBF, namely Cost = M T BF α + K where α is a parameter and K is a constant fixed cost.…”

Section: Monetary Cost and Implementation Issuesmentioning

confidence: 99%

The Spine concept for improving network availability

2015

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Telecommunications networks need to guarantee that all node pairs involved in critical service communications are highly available. Here we adopt a novel approach to the problem of how to provide high levels of availability in an efficient manner. The basic idea is to embed at the physical layer a high availability set of links and nodes (termed the spine) in the network topology to support protection and routing in providing end-to-end availability. We first explore the spine concept through simple topologies illustrating the potential benefits of the approach in improving the overall network availability and the capability to support quality of resilience classes. Then, we study how the structural properties of a network topology can be used to determine heuristics to select a suitable spine and compare this with the case where all network components have the same availability. This is followed by a numerical based study comparing the heuristics with all possible spanning tree based spines for sample topologies. Our results demonstrate how to best design a physical network to support protection methods in achieving high levels of availability efficiently.

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Section: Monetary Cost and Implementation Issuesmentioning

confidence: 99%

The Spine concept for improving network availability

2015

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“…They model the cost functions for maintenance expenditures (considering the required repair time) and also the spent protection capacity and survivability mechanism. As reported in [18], with a reasonable approximation, the value of MTTR can be shown to be directly proportional to the physical unavailability of each span.…”

Section: Related Work On Cost Modelingmentioning

confidence: 93%

“…The authors of [18] argue that reductions in the physical Mean Time To Repair (MTTR) can also enhance availability at full or partial dual-failures -besides adding protection capacity. They show that an economic strategy exists for balancing the trade-off between capacity investment and MTTR reduction efforts to achieving high availability in networks designed to be 100% restorable against single failures.…”

Section: Related Work On Cost Modelingmentioning

confidence: 99%

On the trade-off between cost and availability of virtual networks

Herker

Kieß

et al. 2014

2014 IFIP Networking Conference

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To minimize cost, Virtual Network Operators (VNOs) need to consider the required network availability already at the network design stage. One generic approach to reach the availability target is to select only high-quality physical network elements that offer high availability and consequently demand high expenses per element. The other generic approach to achieve high availability is to add protection capacity on the level of the virtual network based on lower cost components. In this paper, we analyze both alternatives with a simulation tool to answer the fundamental question how quality can be traded against capacity. For this purpose, we consider different network topologies and the influence of different parameters and provide a framework to find an optimal strategy between Mean Time Between Failures (MTBF) targets for the physical infrastructure and the usage of additional backup paths on the virtual network level.

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“…10 In telecommunication networks, cable damage could be caused by improper installation, car crash, and even gun shooting. For example, some schemes increase MTTF by deploying reliable facilities or selecting reliable routes with more protection and/or restoration mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Upgrading service availability of optical networks: A labor force perspective

Chang

Wang

2018

Int J Communication

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Service availability is an important issue in optical networks. Much research attention has been drawn to the provisioning of reliable connections achieved by approaches such as routing and wavelength assignment and by protection and restoration mechanisms. In contrast, the research on upgrading networks to meet new or dynamic demands of service availability based on network upgrading process has been comparatively lacking. In this paper, we address this issue by upgrading service availability from the perspective of labor forces for network maintenance. Our approach is premised on the assumption that the time period for fixing an optical link can be reduced by using more network resources of labor forces. To model this concept, we conduct Amdahl's law, a well-known theorem in parallel computing, to describe human teamwork. To show the effectiveness of this concept, we propose mixed integer linear programming aiming at either maximizing service availability under limited labor forces or minimizing labor forces for predetermined service availability. In addition, a heuristic algorithm for upgrading service availability is presented.Our experimental results show that our network upgrading process can improve service availability optimally with a fixed number of forces and the proposed heuristic algorithm can effectively save computation time.

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High availability survivable networks: When is reducing MTTR better than adding protection capacity?

Cited by 14 publications

References 9 publications

The Spine concept for improving network availability

The Spine concept for improving network availability

On the trade-off between cost and availability of virtual networks

Upgrading service availability of optical networks: A labor force perspective

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