The Experts below are selected from a list of 501 Experts worldwide ranked by ideXlab platform
Chadi M. Assi - One of the best experts on this subject based on the ideXlab platform.
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Planning and optimization of highly resilient multi-Ring ERP-based mesh networks
2013 9th International Conference on the Design of Reliable Communication Networks (DRCN), 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP)'s ability to provide sub-50 ms failover time enhances the candidacy of Carrier Ethernet over conventional SONET/SDH as the technology of choice for packet transport networks. To ensure higher service availability, the logical ERP should be carefully designed by consideRing concurrent dual link failures. In this paper, we categorize the network service outages subject to concurrent dual link failures. We address the problem of optimal capacity provisioning while providing higher service availability and formulate this as an joint optimization problem. We show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection with the objective of maximizing the network flow under any dual link failure scenario. Numerical evaluations as well as comparisons are carried out which show the effectiveness (in terms allocated capacity and service outages) of the presented design approach.
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DRCN - Planning and optimization of highly resilient multi-Ring ERP-based mesh networks
2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP)'s ability to provide sub-50 ms failover time enhances the candidacy of Carrier Ethernet over conventional SONET/SDH as the technology of choice for packet transport networks. To ensure higher service availability, the logical ERP should be carefully designed by consideRing concurrent dual link failures. In this paper, we categorize the network service outages subject to concurrent dual link failures. We address the problem of optimal capacity provisioning while providing higher service availability and formulate this as an joint optimization problem. We show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection with the objective of maximizing the network flow under any dual link failure scenario. Numerical evaluations as well as comparisons are carried out which show the effectiveness (in terms allocated capacity and service outages) of the presented design approach.
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Design of Resilient Ethernet Ring Protection (ERP) Mesh Networks With Improved Service Availability
Journal of Lightwave Technology, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. ERP's promise to provide Protection in mesh packet transport networks positions Ethernet as a prominent competitor to conventional SONET/SDH and as the technology of choice for carrier networks. Higher service availability, however, in ERP has been challenged by the issue of network partitioning and contention for shared capacity caused by concurrent failures. In this paper, we show that in a network designed to withstand single-link failure, the service availability, in the presence of double link failures, depends on the designed ERP scheme, i.e., the RPL placement as well as the selection of Ring hierarchy. Therefore, we present a study for characterizing service outages and propose a design method which strikes a balance between capacity requirement and service availability (i.e., the number of service outages resulting from concurrent failures). We observe that through effective design, remarkable reduction in service outages is obtained at a modest increase in capacity deployment.
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A Max-Flow Design Approach for Improved Service Availability in Multi-Ring ERP Networks
IEEE Transactions on Communications, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. In addition to Ethernet's cost-effectiveness and simplicity, ERP's promise to also provide Protection in mesh packet transport networks positions Ethernet as a prominent competitor to conventional SONET/SDH and the technology of choice for carrier networks. Higher service availability, however, in ERP mesh networks has been challenged by the issue of network partitioning and the contention for Protection resources which may be caused by concurrent failures. In this paper, we show that in a mesh network designed to withstand only single failure situations, network services usually suffer from two outage categories subject to concurrent dual-link failures. We address the problem of minimal capacity network design to provide high service availability against concurrent dual-link failures. We cast this combinatorially complex design problem as an optimization one and show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection. The objective is to maximize the network flow under any dual-link failure scenario. Our design achieves minimal capacity allocation that minimizes the number of service outages (up to 37%) therefore achieving higher service availability. Numerical evaluation and comparative study show that the joint desgin approach of the ILP model provisions 8% less capacity than the sequential two-step approach to achieve similar service availability.
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Optimal capacity planning and RPL placement in carrier Ethernet mesh network design
2012 IEEE International Conference on Communications (ICC), 2012Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. Assi, Martin MaierAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. ERP's promise to also provide Protection in multi-Ring mesh packet transport networks will position Ethernet as a serious competitor to conventional SONET/SDH and the technology of choice for carrier networks. Operating ERP in multi-Ring mesh networks however comes with unique challenges. This paper presents an optimal ERP capacity design formulation by jointly solving the problem of routing, RPL placement, and Ring hierarchy selection. When prior work relied on exhaustive enumeration, our current design is formulated as an integer linear program (ILP) which is shown to be both more capacity and computationally efficient.
Mohammad Nurujjaman - One of the best experts on this subject based on the ideXlab platform.
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Optimal Design Strategies for Survivable Carrier Ethernet Networks
2013Co-Authors: Mohammad NurujjamanAbstract:Ethernet technologies have evolved through enormous standardization efforts over the past two decades to achieve carrier-grade functionalities, leading to carrier Ethernet. Carrier Ethernet is expected to dominate next generation backbone networks due to its low-cost and simplicity. Ethernet's ability to provide carrier-grade Layer-2 Protection switching with SONET/SDH-like fast restoration time is achieved by a new Protection switching protocol, Ethernet Ring Protection (ERP). In this thesis, we address two important design aspects of carrier Ethernet networks, namely, survivable design of ERP-based Ethernet transport networks together with energy efficient network design. For the former, we address the problem of optimal resource allocation while designing logical ERP for deployment and model the combinatorially complex problem of joint Ring Protection Link (RPL) placements and Ring hierarchies selection as an optimization problem. We develop several Mixed Integer Linear Programming (MILP) model to solve the problem optimally consideRing both single link failure and concurrent dual link failure scenarios. We also present a traffic engineeRing based ERP design approach and develop corresponding MILP design models for configuRing either single or multiple logical ERP instances over one underlying physical Ring. For the latter, we propose two novel architectures of energy efficient Ethernet switches using passive optical correlators for optical bypassing as well as using energy efficient Ethernet (EEE) ports for traffic aggregation and forwarding. We develop an optimal frame scheduling model for EEE ports to ensure minimal energy consumption by using packet coalescing and efficient scheduling.
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Planning and optimization of highly resilient multi-Ring ERP-based mesh networks
2013 9th International Conference on the Design of Reliable Communication Networks (DRCN), 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP)'s ability to provide sub-50 ms failover time enhances the candidacy of Carrier Ethernet over conventional SONET/SDH as the technology of choice for packet transport networks. To ensure higher service availability, the logical ERP should be carefully designed by consideRing concurrent dual link failures. In this paper, we categorize the network service outages subject to concurrent dual link failures. We address the problem of optimal capacity provisioning while providing higher service availability and formulate this as an joint optimization problem. We show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection with the objective of maximizing the network flow under any dual link failure scenario. Numerical evaluations as well as comparisons are carried out which show the effectiveness (in terms allocated capacity and service outages) of the presented design approach.
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DRCN - Planning and optimization of highly resilient multi-Ring ERP-based mesh networks
2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP)'s ability to provide sub-50 ms failover time enhances the candidacy of Carrier Ethernet over conventional SONET/SDH as the technology of choice for packet transport networks. To ensure higher service availability, the logical ERP should be carefully designed by consideRing concurrent dual link failures. In this paper, we categorize the network service outages subject to concurrent dual link failures. We address the problem of optimal capacity provisioning while providing higher service availability and formulate this as an joint optimization problem. We show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection with the objective of maximizing the network flow under any dual link failure scenario. Numerical evaluations as well as comparisons are carried out which show the effectiveness (in terms allocated capacity and service outages) of the presented design approach.
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Design of Resilient Ethernet Ring Protection (ERP) Mesh Networks With Improved Service Availability
Journal of Lightwave Technology, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. ERP's promise to provide Protection in mesh packet transport networks positions Ethernet as a prominent competitor to conventional SONET/SDH and as the technology of choice for carrier networks. Higher service availability, however, in ERP has been challenged by the issue of network partitioning and contention for shared capacity caused by concurrent failures. In this paper, we show that in a network designed to withstand single-link failure, the service availability, in the presence of double link failures, depends on the designed ERP scheme, i.e., the RPL placement as well as the selection of Ring hierarchy. Therefore, we present a study for characterizing service outages and propose a design method which strikes a balance between capacity requirement and service availability (i.e., the number of service outages resulting from concurrent failures). We observe that through effective design, remarkable reduction in service outages is obtained at a modest increase in capacity deployment.
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A Max-Flow Design Approach for Improved Service Availability in Multi-Ring ERP Networks
IEEE Transactions on Communications, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. In addition to Ethernet's cost-effectiveness and simplicity, ERP's promise to also provide Protection in mesh packet transport networks positions Ethernet as a prominent competitor to conventional SONET/SDH and the technology of choice for carrier networks. Higher service availability, however, in ERP mesh networks has been challenged by the issue of network partitioning and the contention for Protection resources which may be caused by concurrent failures. In this paper, we show that in a mesh network designed to withstand only single failure situations, network services usually suffer from two outage categories subject to concurrent dual-link failures. We address the problem of minimal capacity network design to provide high service availability against concurrent dual-link failures. We cast this combinatorially complex design problem as an optimization one and show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection. The objective is to maximize the network flow under any dual-link failure scenario. Our design achieves minimal capacity allocation that minimizes the number of service outages (up to 37%) therefore achieving higher service availability. Numerical evaluation and comparative study show that the joint desgin approach of the ILP model provisions 8% less capacity than the sequential two-step approach to achieve similar service availability.
Samir Sebbah - One of the best experts on this subject based on the ideXlab platform.
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Planning and optimization of highly resilient multi-Ring ERP-based mesh networks
2013 9th International Conference on the Design of Reliable Communication Networks (DRCN), 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP)'s ability to provide sub-50 ms failover time enhances the candidacy of Carrier Ethernet over conventional SONET/SDH as the technology of choice for packet transport networks. To ensure higher service availability, the logical ERP should be carefully designed by consideRing concurrent dual link failures. In this paper, we categorize the network service outages subject to concurrent dual link failures. We address the problem of optimal capacity provisioning while providing higher service availability and formulate this as an joint optimization problem. We show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection with the objective of maximizing the network flow under any dual link failure scenario. Numerical evaluations as well as comparisons are carried out which show the effectiveness (in terms allocated capacity and service outages) of the presented design approach.
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DRCN - Planning and optimization of highly resilient multi-Ring ERP-based mesh networks
2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP)'s ability to provide sub-50 ms failover time enhances the candidacy of Carrier Ethernet over conventional SONET/SDH as the technology of choice for packet transport networks. To ensure higher service availability, the logical ERP should be carefully designed by consideRing concurrent dual link failures. In this paper, we categorize the network service outages subject to concurrent dual link failures. We address the problem of optimal capacity provisioning while providing higher service availability and formulate this as an joint optimization problem. We show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection with the objective of maximizing the network flow under any dual link failure scenario. Numerical evaluations as well as comparisons are carried out which show the effectiveness (in terms allocated capacity and service outages) of the presented design approach.
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Design of Resilient Ethernet Ring Protection (ERP) Mesh Networks With Improved Service Availability
Journal of Lightwave Technology, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. ERP's promise to provide Protection in mesh packet transport networks positions Ethernet as a prominent competitor to conventional SONET/SDH and as the technology of choice for carrier networks. Higher service availability, however, in ERP has been challenged by the issue of network partitioning and contention for shared capacity caused by concurrent failures. In this paper, we show that in a network designed to withstand single-link failure, the service availability, in the presence of double link failures, depends on the designed ERP scheme, i.e., the RPL placement as well as the selection of Ring hierarchy. Therefore, we present a study for characterizing service outages and propose a design method which strikes a balance between capacity requirement and service availability (i.e., the number of service outages resulting from concurrent failures). We observe that through effective design, remarkable reduction in service outages is obtained at a modest increase in capacity deployment.
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A Max-Flow Design Approach for Improved Service Availability in Multi-Ring ERP Networks
IEEE Transactions on Communications, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi M. AssiAbstract:Ethernet Ring Protection (ERP) has recently emerged to provide Protection switching for Ethernet Ring topologies with sub-50 ms failover capabilities. In addition to Ethernet's cost-effectiveness and simplicity, ERP's promise to also provide Protection in mesh packet transport networks positions Ethernet as a prominent competitor to conventional SONET/SDH and the technology of choice for carrier networks. Higher service availability, however, in ERP mesh networks has been challenged by the issue of network partitioning and the contention for Protection resources which may be caused by concurrent failures. In this paper, we show that in a mesh network designed to withstand only single failure situations, network services usually suffer from two outage categories subject to concurrent dual-link failures. We address the problem of minimal capacity network design to provide high service availability against concurrent dual-link failures. We cast this combinatorially complex design problem as an optimization one and show that higher service availability can be achieved by proper RPL (Ring Protection Link) placement and Ring hierarchy selection. The objective is to maximize the network flow under any dual-link failure scenario. Our design achieves minimal capacity allocation that minimizes the number of service outages (up to 37%) therefore achieving higher service availability. Numerical evaluation and comparative study show that the joint desgin approach of the ILP model provisions 8% less capacity than the sequential two-step approach to achieve similar service availability.
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Multi-Ring ERP Network Design: A Traffic EngineeRing Approach
IEEE Communications Letters, 2013Co-Authors: Mohammad Nurujjaman, Samir Sebbah, Chadi AssiAbstract:The recent Ethernet Ring Protection (ERP) method bRings new challenges into the design of next generation Ethernet carrier networks. This letter addresses one of the design challenges that may confront a network operator in its migration to provide ERP capabilities over an existing network. The objective of the design is to properly allocate network resources to maximize the service provider's revenue given the per-link deployed capacity. We formulate this problem of resource allocation as an optimization model with the objective of maximizing the network flow using the well-known max-min approach. Our proposed model ensures fairness among the admissible flows and the design of a proper Protection plan to survive against any single link failure. Numerical results show that the proposed design approach can increase the overall network flow by up to 44.7% in comparison to an arbitrarily designed ERP network while it allocates bandwidth 29.3% more fairly among the sessions.
Jeong-dong Ryoo - One of the best experts on this subject based on the ideXlab platform.
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Managed FDBAlgor ithmandProtection inEthernet RingTopology
2020Co-Authors: Jeong-dong RyooAbstract:Abstract We propose anEthernet Ring Protection technique introducing a managed forwarding database scheme (FDB). The major benefit ofthe proposed FDBscheme is provisioning witha cost-optimized path that eliminates an unnecessary overprovision requirement. I. INTRODUCTION Ethernet Ring Protection is gaining its importance as Ethemnet technology is being aggressively deployed in thecarrier networks. IEEE 802.17 RPR standard, i.e. resilient packetRing, specifies a variant ofEthernet Ring and Protection. A newer technology that utilizes the generic feature oftheEthernet MAC standard is being standardized at ITU-T as G.8032. The main idea is to utilize the APS (AutomaticProtection Signal) and AIS (Alarm Indication Signal) framesdefined by ITU-T Y.1731 and G8031 standard for EthernetOAM (operation, administration, and maintenance). Theseprotocols provide Ethernet Ring Protection with a simple algorithm where managing a blocking port to prevent forming a loop in Ethernet Ring topology. However,
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faultless Protection methods in self healing ethernet Ring networks
Etri Journal, 2012Co-Authors: Jeong-dong RyooAbstract:Self-healing Ethernet Rings show promise for realizing the SONET/SDH-grade resilience in Carrier Ethernet infrastructures. However, when a Ring is faulty, highpriority Protection messages are processed in less time than low-priority data frames are processed. In this situation, any delayed data frames either being queued or traveling through long Ring spans will cause the Ring nodes to generate incorrect forwarding information. As a result, the data frames spread in the wrong direction, causing the Ring to become unstable. To solve this problem, we propose four schemes, that is, dual flush, flush delay timer setting, purge triggeRing, and priority setting, and evaluate their Protection performance under various traffic conditions on a Ring based on the Ethernet Ring Protection (ERP) method. In addition, we develop an absorbing Markov chain model of the ERP protocol to observe how traffic congestion can impact the Protection performance of the proposed priority setting scheme. Based on our observations, we propose a more reliable priority setting
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An Optimal Ring-Protection-Link Positioning Algorithm in Carrier Ethernet Ring Networks
IEEE Communications Letters, 2012Co-Authors: Jeong-dong RyooAbstract:Ethernet Ring Protection (ERP), defined in ITU-T recommendation G.8032, is a promising technology to realize the SONET/SDH-grade resilience in carrier Ethernet infrastructures. With its own loop prevention technique to block a link called Ring-Protection-link (RPL) in an ERP Ring, the ERP introduces a new optimization problem named RPL positioning whose objective is to find the optimal RPL location to minimize the required Ring capacity for given traffic demands. In this paper, we derive the optimal RPL positioning as an integer linear programming (ILP) problem and additionally propose an optimal RPL positioning algorithm for more effective Ring loading. By evaluations, we demonstrate that our proposed algorithm is indeed capable of finding the optimal RPL equal to the results by an exhaustive search emerged in prior works or the formulated ILP model. But, it is more efficient in computing time than the exhaustive search and the ILP model.
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flush optimizations to guarantee less transient traffic in ethernet Ring Protection
Etri Journal, 2010Co-Authors: Jeong-dong RyooAbstract:Ethernet Ring Protection (ERP) technology, which is defined in ITU-T Recommendation G.8032, has been developed to provide carrier grade recovery for Ethernet Ring networks. However, the filteRing database (FDB) flush method adopted in the current ERP standard has the drawback of introducing a large amount of transient traffic overshoot caused by flooded Ethernet frames right after Protection switching. This traffic overshooting is especially critical when a Ring provides services to a large number of clients. According to our experimental results, the traditional FDB flush requires a link capacity about sixteen times greater than the steady state traffic bandwidth. This paper introduces four flush optimization schemes to resolve this issue and investigates how the proposed schemes deal with the transient traffic overshoot on a multi-Ring network under failure conditions. With a network simulator, we evaluate the performance of the proposed schemes and compare them to the conventional FDB flush scheme. Among the proposed methods, the extended FDB advertisement method shows the fastest and most stable Protection switching performance.
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an ethernet Ring Protection method to minimize transient traffic by selective fdb advertisement
Etri Journal, 2009Co-Authors: Jeong-dong RyooAbstract:We introduce an improved Ethernet Ring Protection method, selective filteRing database (FDB) advertisement, to minimize traffic overshoot in the event of a failure or recovery. On the Protection switching event, the proposed method makes all Ring nodes perform an FDB flush except the FDB entries associated with their client subnets. Then, Ring nodes rapidly exchange their client MAC address lists so that their FDBs are immediately updated by indirect MAC address learning. The proposed scheme guarantees fast and reliable Protection switching over the standard scheme.
June-koo Kevin Rhee - One of the best experts on this subject based on the ideXlab platform.
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Reliable Network Design for Ethernet Ring Mesh Networks
Journal of Lightwave Technology, 2013Co-Authors: No-gil Myoung, June-koo Kevin RheeAbstract:A Novel Design Optimization For Reliable Networking Is Investigated In Ethernet Ring Mesh Networks With The Itu-T G.8032 Ethernet Ring Protection Recommendation. Designing An Ethernet Ring Mesh Consisting Of Multiple Rings To Achieve The Maximum Network Availability Is An Np-Complete Problem. We Show That A Graph With Vertex Connectivity Equal To Or Greater Than Two Is A Sufficient Condition For Designing An Ethernet Ring Mesh. A Novel Design Rule With An Efficient Heuristic Algorithm Is Proposed To Find A Design Close To An Optimal Ethernet Ring Mesh In Terms Of Maximum Network Availability. Compared With An Optimal Network Design Algorithm With An Exponential Enumeration Search Cost, The Heuristic Algorithm Achieves Network Availability Nearly As High As That Of An Optimal Design At A Polynomial Cost.
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Flush optimization in Ethernet Ring Protection network
ICTC 2011, 2011Co-Authors: June-koo Kevin RheeAbstract:In this paper, we propose a flush optimization algorithm for fast Protection switching in an Ethernet Ring Protection (ERP) network. To evaluate performance of our algorithm, we implement our algorithm on ERP in Ethernet switches and experiment on Protection switching in an Ethernet Ring network. We measure Protection switching time under a link failure as increasing the number of traffic flows and compare performance with the general ERP. Experiment results show our algorithm always provides Protection switching time less than 30ms even though the number of traffic flows increases.
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Efficient Ethernet Ring Mesh Network Design
Journal of Lightwave Technology, 2011Co-Authors: June-koo Kevin RheeAbstract:Ethernet Ring Protection (ERP) is an emerging solution for carrier-grade optical Ethernet networking developed as an ITU-T recommendation. The most recent development of the ERP technique provides multi-Ring Protection in a mesh packet transport network. The ERP configuration and capacity planning in a Ring mesh topology can be optimized in the selection of the interconnected Ring hierarchy and logical loop prevention block positions. This paper reports the first investigation to understand the designing principles of protected Ethernet Ring mesh networks and proposes an optimized design scheme for cost-effective and reliable ERP networking.
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Ethernet Ring Protection networks
Digest of the 9th International Conference on Optical Internet (COIN 2010), 2010Co-Authors: June-koo Kevin Rhee, Eunhong ParkAbstract:The ITU-T Ethernet Ring Protection scheme provides 50 ms Ethernet Protection in a Ring mesh network. We discuss the operation principle and capacity planning schemes for multi-class QoS Ethernet services.
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ethernet Ring Protection using filteRing database flip scheme for minimum capacity requirement
Etri Journal, 2008Co-Authors: June-koo Kevin Rhee, Jinsung Im, Jeong-dong RyooAbstract:Ethernet Ring Protection is a new technology introduced in ITU-T Recommendation G.8032, which utilizes the generic Ethernet MAC functions. We introduce an alternative enhanced Protection switching scheme to suppress penalty in the switching transient, in which the Ethernet MAC filteRing database (FDB) is actively and directly modified by information disseminated from the nodes adjacent to failure. The modified FDB at all nodes are guaranteed to be consistent to form a complete new Ring network topology immediately. This scheme can reduce the capacity requirement of the G.8032 by several times. This proposed scheme can be also applied in IP Protection Rings.
