Статті в журналах: "Software switch"

1

Singh, Rachee, Muqeet Mukhtar, Ashay Krishna, Aniruddha Parkhi, Jitendra Padhye, and David Maltz. "Surviving switch failures in cloud datacenters." ACM SIGCOMM Computer Communication Review 51, no. 2 (April 11, 2021): 2–9. http://dx.doi.org/10.1145/3464994.3464996.

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Switch failures can hamper access to client services, cause link congestion and blackhole network traffic. In this study, we examine the nature of switch failures in the datacenters of a large commercial cloud provider through the lens of survival theory. We study a cohort of over 180,000 switches with a variety of hardware and software configurations and find that datacenter switches have a 98% likelihood of functioning uninterrupted for over 3 months since deployment in production. However, there is significant heterogeneity in switch survival rates with respect to their hardware and software: the switches of one vendor are twice as likely to fail compared to the others. We attribute the majority of switch failures to hardware impairments and unplanned power losses. We find that the in-house switch operating system, SONiC, boosts the survival likelihood of switches in datacenters by 1% by eliminating switch failures caused by software bugs in vendor switch OSes.

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2

Densmore, W., R. J. Jakubek, M. J. Miracle, and J. H. Sun. "System 75:Switch Services Software." AT&T Technical Journal 64, no. 1 (January 1985): 197–212. http://dx.doi.org/10.1002/j.1538-7305.1985.tb00428.x.

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3

Fu, Wenwen, Tao Li, and Zhigang Sun. "FAS: Using FPGA to Accelerate and Secure SDN Software Switches." Security and Communication Networks 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/5650205.

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Software-Defined Networking (SDN) promises the vision of more flexible and manageable networks but requires certain level of programmability in the data plane to accommodate different forwarding abstractions. SDN software switches running on commodity multicore platforms are programmable and are with low deployment cost. However, the performance of SDN software switches is not satisfactory due to the complex forwarding operations on packets. Moreover, this may hinder the performance of real-time security on software switch. In this paper, we analyze the forwarding procedure and identify the performance bottleneck of SDN software switches. An FPGA-based mechanism for accelerating and securing SDN switches, named FAS (FPGA-Accelerated SDN software switch), is proposed to take advantage of the reconfigurability and high-performance advantages of FPGA. FAS improves the performance as well as the capacity against malicious traffic attacks of SDN software switches by offloading some functional modules. We validate FAS on an FPGA-based network processing platform. Experiment results demonstrate that the forwarding rate of FAS can be 44% higher than the original SDN software switch. In addition, FAS provides new opportunity to enhance the security of SDN software switches by allowing the deployment of bump-in-the-wire security modules (such as packet detectors and filters) in FPGA.

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4

Mochalov, Valery P., Gennady I. Linets, Natalya Yu Bratchenko, and Svetlana V. Govorova. "An Analytical Model of a Corporate Software-Controlled Network Switch." Scalable Computing: Practice and Experience 21, no. 2 (June 27, 2020): 337–46. http://dx.doi.org/10.12694/scpe.v21i2.1698.

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Implementing the almost limitless possibilities of a software-defined network requires additional study of its infrastructure level and assessment of the telecommunications aspect. The aim of this study is to develop an analytical model for analyzing the main quality indicators of modern network switches. Based on the general theory of queuing systems and networks, generated functions and Laplace-Stieltjes transforms, a three-phase model of a network switch was developed. Given that, in this case, the relationship between processing steps is not significant, quality indicators were obtained by taking into account the parameters of single-phase networks. This research identified the dependencies of service latency and service time of incoming network packets on load, as well as equations for finding the volume of a switch’s buffer memory with an acceptable probability for message loss.

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5

Nuraeni, Mega Safira, Eka Wahyudi, and Nanda Iryani. "Perbandingan Kontroler POX, Ryu dan ONOS Pada Arsitektur Software Defined Network (SDN) Menggunakan Topologi Linear." Journal of Telecommunication, Electronics, and Control Engineering (JTECE) 4, no. 2 (July 4, 2022): 66–79. http://dx.doi.org/10.20895/jtece.v4i2.360.

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Abstrak Software defined network merupakan konsep baru yang memisahkan data plane dengan control plane. Kontroler menjadi suatu hal yang penting dalam membangun arsitektur software defined network, sehingga dibutuhkan informasi terkait performansi kontroler untuk mengetahui tingkat kemampuan suatu kontroler, bebarapa kontroler yang ada diantaranya POX, Ryu dan ONOS. Pada penenelitan ini menggunakan topologi jaringan linear yang menggunakan 10 switch dan 10 host, 12 switch dan 12 host, 14 switch dan 14 host dan 16 Switch 16 host pada background traffic 50 Mbps hingga 200 Mbps. Dari pengujian ini diperoleh hasil bahwa kenaikan nilai troughput, delay dan jitter berbanding lurus dengan meningkatnya jumlah switch, kontroler POX memiliki performa terbaik dibandingkan dengan kontroler Ryu dan ONOS dengan nilai troughput yang didapatkan sebesar 5.139,456 Kbits/sec hingga 5.142,139 Kbits/sec, untuk nilai delay yang didapatkan sebesar 0,078 ms hingga 0,110 ms sedangkan untuk nilai jitter diperoleh 0,037 ms hingga 0,070 ms. Abstract Software defined network is a new concept that separates the data plane from the control plane. The controller is an important thing in building a software defined network architecture, so information regarding controller performance is needed to determine the level of capability of a controller, some of the existing controllers include POX, Ryu and ONOS. This research uses a linear network topology that uses 10 switches and 10 host, 12 switches and 12 host, 14 switches and 14 host and 16 switches and 16 host on 50 Mbps to 200 Mbps background traffic. From this test, the results show that the increase in throughput, delay and jitter values is directly proportional to the increase in the number of switches, the POX controller has the best performance compared to the Ryu and ONOS controllers with the throughput value obtained from 5,139,456 Kbits/sec to 5,142,139 Kbits/sec. , for the delay value obtained is 0.078 ms to 0.110 ms while the jitter value is obtained from 0.037 ms to 0.070 ms.

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6

LI, DAWEI, JIE WU, DAJIN WANG, and JIAYIN WANG. "Software-Defined Networking Switches for Fast Single-Link Failure Recovery." Journal of Interconnection Networks 18, no. 04 (December 2018): 1850014. http://dx.doi.org/10.1142/s0219265918500147.

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In this paper, we consider IP fast recovery from single-link failures in a given network topology. The basic idea is to replace some existing routers with a designated switch. When a link fails, the affected router will send all the affected traffic to the designated switch (through pre-configured IP tunnels), which will deliver the affected traffic to its destination without using the failed link. The goal of the approach is to achieve faster failure recovery than traditional routing protocols that employ reactive computing upon link failures. Software-Defined Networking (SDN) switches can serve as the designated switches because they can flexibly redirect affected traffic to other routes, instead of only to the shortest paths in the network. However, SDN switches are very expensive. Our objective is to minimize the number of SDN switches needed and to guarantee that the network can still recover from any single-link failure. For networks with uniform link costs, we show that using normal non-SDN switches with IP tunneling capability as designated switches can guarantee recovery from any single-link failure. For networks with general link costs, we find that not all single-link failures can be recovered by using non-SDN switches as designated switches; by using SDN switches only when necessary, we can reduce the total number of SDN switches needed compared to an existing work. We conduct extensive simulations to verify our proposed approaches.

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7

Wen, Hua Bin, Yong Duan Song, and Rui Li. "A Study on Virtual Prototyping Technology for Vacuum Switch." Advanced Materials Research 187 (February 2011): 528–34. http://dx.doi.org/10.4028/www.scientific.net/amr.187.528.

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The optimal design of vacuum switch is becoming an important research topic with the extensive application and increasing demands of vacuum switches. This paper analyzes the main elements of the vacuum switch design, and gives the design process of the vacuum switch. An optimal design method is proposed for the vacuum switch based on the concept and characteristics of virtual prototyping (VP) technology. By using computer aided design and the related software, we propose a method for vacuum switch modeling VP, the stress field VP of parts, the thermal field VP of electric heat, the electric field VP of insulation parts and the mechanical dynamic VP of kinematics system, which are integrated for optimization design for vacuum switches. This work is expected to provide a new idea for optimal and rapid design of vacuum switches.

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8

MOHAN, J., SHWETA M. DEVANAGAONKAR, VINEETA V. GARUR, A. KARTHIK, K. ROHITAKSHA, and A. B. RAJENDRA. "An Improved Approach for Eliminating the Loop in Hybrid Software Defined Network (SDN) Using Modified Bellman-Ford Algorithm." Journal of Interconnection Networks 20, no. 04 (December 2020): 2150001. http://dx.doi.org/10.1142/s0219265921500018.

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SDN is approaching its own structure of acceptance. Therefore, the increasing deployment of SDNs is being discussed as a possible approach, appearing in the development of the hybrid SDN networks. An foremost work in the hybrid SDN networks is bandwidth allocation, taking into account the integration of both SDN-enabled and conventional switches. The network loop in layer 2 switches is skipped in Spanning Tree Protocol (STP) by ceaselessly watching the network to trace all links and block the unwanted ones. Bridge loops will occur anytime there’s a redundant Layer2 way between ends. By default, switches forward broadcast/multicast out all ports, other than the port from that the broadcast/multicast was delivered. Once a switch loop is brought in the network, broadcast messages are going to be broadcasted more often leading to broadcast storms. The Spanning-tree algorithm enforces a distributed divergent of the Bellman-Ford iterative algorithm that always looks for the optimal solution and selects an optimal influential switch anytime. In this paper we use controller’s global network view for resolving loop problem in layer 2 network. SDN controller acts on broadcast packets received from switch-ports and host-ports differently that is if the broadcast packets received from host ports, the SDN controller broadcasts these packets to all ports and if broadcast packets is received from switch ports, only some switches broadcasts these packets on all ports instead of all switches.

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9

Kartadie, Rikie. "Performance Test of Openflow Agent on Openflow Software-Based Mikrotik RB750 Switch." Scientific Journal of Informatics 3, no. 2 (November 23, 2016): 217–28. http://dx.doi.org/10.15294/sji.v3i2.7987.

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A network is usually developed by several devices such as router, switch etc. Every device forwards data package manipulation with complicated protocol planted in its hardware. An operator is responsible for running configuration either to manage rules or application applied in the network. Human error may occur when device configuration run manually by operator. Some famous vendors, one of them is MikroTik, has also been implementing this OpenFlow on its operation. It provides the implementation of SDN/OpenFlow architecture with affordable cost. The second phase research result showed that switch OF software-based MikroTik resulted higher latency value than both mininet and switch OF software-based OpenWRT. The average gap value of switch OF software-based MikroTik is 2012 kbps lower than the value of switch OF software-based OpenWRT. The average gap value of throughput bandwidth protocol UDP switch OF software-based MikroTik is 3.6176 kBps lower than switch OF software-based OpenWRT and it is 8.68 kBps lower than mininet. The average gap throughput jitter protokol UDP of switch OF software-based MiktoTik is 0.0103ms lower than switch OF software-based OpenWRT and 0.0093ms lower than mininet.

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10

Isyaku, Babangida, Kamalrulnizam Abu Bakar, Mohd Soperi Mohd Zahid, Eman H. Alkhammash, Faisal Saeed, and Fuad A. Ghaleb. "Route Path Selection Optimization Scheme Based Link Quality Estimation and Critical Switch Awareness for Software Defined Networks." Applied Sciences 11, no. 19 (September 29, 2021): 9100. http://dx.doi.org/10.3390/app11199100.

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Software-defined network (SDN) is a new paradigm that decouples the control plane and data plane. This offered a more flexible way to efficiently manage the network. However, the increasing number of traffics due to the proliferation of the Internet of Things (IoT) devices also increase the number of flow arrival which in turn causes flow rules to change more often, and similarly, path setup requests increased. These events required route path computation activities to take place immediately to cope with the new network changes. Searching for an optimal route might be costly in terms of the time required to calculate a new path and update the corresponding switches. However, the current path selection schemes considered only single routing metrics either link or switch operation. Incorporating link quality and switch’s role during path selection decisions have not been considered. This paper proposed Route Path Selection Optimization (RPSO) with multi-constraint. RPSO introduced joint parameters based on link and switches such as Link Latency (LL), Link Delivery Ratio (LDR), and Critical Switch Frequency Score (CWFscore). These metrics encourage path selection with better link quality and a minimal number of critical switches. The experimental results show that the proposed scheme reduced path stretch by 37%, path setup latency by 73% thereby improving throughput by 55.73%, and packet delivery ratio by 12.5% compared to the baseline work.

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11

Alaiwan, Haissam. "IBM 8265 ATM Backbone Switch software architecture." Computer Networks 31, no. 6 (March 1999): 541–58. http://dx.doi.org/10.1016/s0169-7552(98)00281-5.

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12

Burdonov, I. B., N. V. Evtushenko, and A. S. Kossatchev. "Testing switch rules in software defined networks." Proceedings of the Institute for System Programming of the RAS 30, no. 6 (2018): 69–88. http://dx.doi.org/10.15514/ispras-2018-30(6)-4.

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13

Tembey, Priyanka, Augusto Vega, Alper Buyuktosunoglu, Dilma Da Silva, and Pradip Bose. "SMT Switch: Software Mechanisms for Power Shifting." IEEE Computer Architecture Letters 12, no. 2 (July 2013): 67–70. http://dx.doi.org/10.1109/l-ca.2012.26.

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14

Yasin, Alimuddin, and Ismail Mohidin. "Dampak Serangan DDoS pada Software Based Openfow Switch di Perangkat HG553." Jurnal Technopreneur (JTech) 6, no. 2 (November 28, 2018): 72. http://dx.doi.org/10.30869/jtech.v6i2.206.

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Software Defined Network (SDN) adalah salah satu evolusi terbesar dalam dunia jaringan komputer. Dengan adanya SDN kemudahan dalam mengontrol jaringan lebih mudah dibandingkan dengan jaringan komputer biasa. Dimana dengan SDN konfigurasi jaringan lebih terpusat dikarenakan adanya pemisahan antara data plane dengan control plane. Data Plane berada pada sisi perangkat switch sedangkan control plane berada pada sisi server. Ada dua jenis switch Openflow yakni software based Switch Opeflow dan Hardware Based Switch Opeflow. Dalam penelitian ini jenis switch yang di pakai adalah Software Based Openflow Switch yang di pasang pada perangkkat HG553. Isu keamanan adalah isu yang masih terbuka luas untuk diteliti dalam Software Defined Network. Salah satunya adalah DDoS. DDoS adalah kegiatan untuk membanjiri jaringan dengan Data sehingga lalulintas jaringan menjadi penuh dan jaringan tidak dapat diakses oleh orang yang tidak berhak. Jenis DDoS UDP Flooding adalah jenis DDoS Conectionless. Dalam penelitian menunjukan DDoS UDP Flooding yang terjadi dalam jaringan SDN menyebabkan jaringan SDN sulit untuk di akses dikarenakan Switch Opeflow terlepas dari kontroller dan menyebabkan penggunaan reource tinggi pada Switch Openflow.

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15

Li, Zonghui, Hai Wan, Yangdong Deng, Xibin Zhao, Yue Gao, Xiaoyu Song, and Ming Gu. "Time-Triggered Switch-Memory-Switch Architecture for Time-Sensitive Networking Switches." IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 39, no. 1 (January 2020): 185–98. http://dx.doi.org/10.1109/tcad.2018.2883996.

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16

Guo, Chao, Cheng Gong, Juan Guo, Haitao Xu, and Long Zhang. "TCQG—Software-Defined Transmission Control Scheme in 5G Networks from Queuing Game Perspective." Sensors 19, no. 19 (September 26, 2019): 4170. http://dx.doi.org/10.3390/s19194170.

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The efficient processing and forwarding of big data is one of the key problems and challenges facing the next generation wireless communication network. Using a software definition method to virtualize the network can improve the efficiency of network operation and reduce the cost of network operation and maintenance. A software-defined transmission control scheme was presented to solve the excessive controller flow problem for 5G networks. Based on the queuing game theory, a system model was built due to the competition among the requests of the switch. The transmission control platform was in charge of resource allocation. It got maximum social welfare under a profit-maximizing fee. In this model, the optimal queue length was calculated and discussed in a first-come-first-served and last-come-first-served with preemption discipline. The optimal queue length was obtained and the optimal admission fee was calculated. Then, the single switch single controller transmission control model was extended to the multi-switches single controller model. As a result, the social welfare of the system containing the controller’s profit and switch surplus reaches the maximum.

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17

Guan, Qiong, Han Qing Tao, and Bin Huang. "The Computer Interlocking Software System Reliability Test Based on the Monte Carlo." Applied Mechanics and Materials 614 (September 2014): 397–400. http://dx.doi.org/10.4028/www.scientific.net/amm.614.397.

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The railway switch failure prediction for railway signal equipment maintenance plays an important role. The paper put forward railway switch failure prediction algorithm based on least squares support vector machine, and chose five characteristic indexes composed of railway switch failure prediction models characteristic input vectors. It reduces the dimension of input vectors, shorten the least squares support vector machine training time, and use a pruning algorithm to accelerate the computing speed maintaining a good regression performance at the same time. The experiment proved that railway switch failure prediction algorithm has strong self-learning ability and higher prediction accuracy based on least squares support vector machine. And it can accelerate the speed of switch failure prediction and improve the accuracy and reliability of railway switch failure prediction.

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18

Xu, Jinxin, Qingwu Li, Ying Luo, Yan Zhou, and Jiayu Wang. "State measurement of isolating switch using cost fusion and smoothness prior based stereo matching." International Journal of Advanced Robotic Systems 17, no. 3 (May 1, 2020): 172988142092529. http://dx.doi.org/10.1177/1729881420925299.

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To better monitor the state of isolating switches, an efficient binocular vision-based state measurement system is proposed in this article. Two optimal cameras are selected as the vision of our inspection system. Firstly, stereo calibration and distortion rectification are performed on acquired image pair. Secondly, to recover the three-dimensional information of switch, we propose a semi-global stereo matching method by using data- and structure-driven cost volume fusion and then optimizing raw disparity map with weighted- and edge discriminated-smoothness prior. Gradient content is enforced on the weight for suppressing small-weight-accumulation problem in weak-textured regions. Besides, Hough transform with feature constraints is implemented for removing the chaotic lines and extracting center line of the switch arm. Finally, based on the center line and corresponding disparity map of the switch arm, triangulation principle is used for calculating the true angle between the switch arm and insulator such that whether or not the isolating switch is fully closed can be detected. The experimental results demonstrate that the proposed stereo matching method can achieve good performance in Middlebury v.3 data set and switch images, and the system can precisely measure the state of switches.

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19

Kartadie, Rikie. "MIKROTIK RB750 ROUTERBOARD SEBAGAI ALTERNATIF SWITCH OPENFLOW SOFTWARE-BASE." Simetris : Jurnal Teknik Mesin, Elektro dan Ilmu Komputer 7, no. 2 (November 1, 2016): 467. http://dx.doi.org/10.24176/simet.v7i2.756.

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Software-Defined Networking (SDN) merupakan cara untuk mengurangi kompleksitas konfigurasi jaringan dan manajemen jaringan. Solusi yang ditawarkan oleh SDN memberikan nuansa baru pada jaringan komputer. Pengimplementasian arsitektur SDN/OpenFlow membutuhkan biaya yang tinggi, sedangkan penggunaan emulator mininet mampu memberikan simulasi yang baik pada skala penelitian, namun dalam kenyataannya implementasinya membutuhkan hardware. Pengimplementasian OpenFlow pada switch telah merambah kebeberapa vendor, diantaranya MikroTik yang telah menambahkan OpenFlow agent pada OS versi 6.17 pada RouterOS nya dan memungkinkannya untuk dapat diimplementasikan pada arsitektur SDN/OpenFlow dengan biaya yang lebih terjangkau. Implementasi OpenFlow agent pada RouterOS MikroTik layak untuk diuji performanya, sebagai alternatif switch OpenFlow software-base. Penelitian ini adalah penelitian awal dari rangkaian penelitian yang akan dilakukan. Langkah-langkah penelitian adalah: (1)Merancang topologi, (2)Simulasi menggunakan emulator mininet sebagai data pembanding (dianggap sebagai representatif dari hardware-base switch), (3)Memodifikasi MikroTik RB750 sebagai prototipe switch OpenFlow software-base, (4) Pengujian prototipe, (5) Analisis hasil dan menarik kesimpulan. Dari hasil uji latency, prototipe memberikan nilai lebih tinggi dibandingkan dengan nilai pembandingnya, nilai throughput TPC dan UDP 1937.5 kbps dan 8.64 kbps dan nilai jitter 0.0093 msec lebih rendah dibandingkan nilai pembandingnya. Prototipe dapat dijadikan alternatif pengganti switch OpenFlow Software-based, walaupun prototipe masih memberikan nilai performa yang rendah. Kata kunci: mininet, mikrotik, software-defined network, openflow.

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20

Yi, Xin Hua, Xiao Min Cheng, and Min Jun Wang. "Reliability Analysis of Door Magnetic Switch under Different Permanent Magnetic Distribution." Applied Mechanics and Materials 239-240 (December 2012): 328–31. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.328.

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In order to improve the reliability and safety of door magnetic switch, a mathematical model of three reed switches was designed to satisfy this requirement under different permanent magnetic distribution. To obtain the same magnetic adsorption force for the magnetic reed switch, this paper uses a simulation method based on ANSYS software to mainly analyze the different distribution of three permanent magnets how to affect the adsorption force of door magnetic switch. The simulation results demonstrate that the adsorption force is different for different layout of permanent magnet and help to obtain the installing position of the reed switch and to improve the reliability.

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21

NUGROHO, KUKUH, and DHIMAS PRABOWO SETYANUGROHO. "Analisis Kinerja RouteFlow pada Jaringan SDN (Software Defined Network ) menggunakan Topologi Full-Mesh." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 7, no. 3 (September 30, 2019): 585. http://dx.doi.org/10.26760/elkomika.v7i3.585.

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ABSTRAKPerangkat controller dalam jaringan SDN berfungsi untuk memberikan informasi tabel flow ke perangkat switch sebagai acuan dalam menentukan informasi rute. Kecepatan dalam memproses permintaan tabel flow yang dilakukan oleh perangkat switch tergantung dari pemilihan jenis controller yang digunakan. Terdapat beberapa jenis controller yang bisa digunakan untuk mengatur aliran trafik data dalam jaringan SDN. Pada penelitian ini akan digunakan jenis controller RouteFlow dengan menggunakan algoritma routing Djikstra. Jaringan uji menggunakan topologi Full-Mesh yang menyediakan koneksi penuh ke semua switch, dimana terdapat dua protokol layer transport yang digunakan untuk mengirimkan data dalam jaringan SDN yaitu TCP dan UDP. Hasil pengukuran kualitas jaringan menunjukkan bahwa penggunaan protokol UDP menghasilkan nilai delay, jitter, dan throughput yang lebih baik dibandingkan dengan TCP. Waktu konvergensi jaringan yang dihasilkan sebesar 12,18 ms ketika ukuran data yang dipertukarkan sebesar 64 Byte.Kata kunci: Controller, Full-Mesh, RouteFlow, Software Defined Network ABSTRACTThe controller device in the SDN network is applied to provide flow table information for all switches as a reference in determining route information. The speed in processing the flow table requests that are made by the switches depends on the choice of the type of controller used. There are several types of controllers that can be used to manage the data traffic flow in the SDN network. This research utilizes the RouteFlow controller and the Djikstra routing algorithm. The test network applies the Full-Mesh topology that provides fully connections to all switches, wherein two transport protocols are used to transmit data in SDN networks, i.e., TCP and UDP. The results of network performance measurements show that the use of the UDP obtains better values in delay, jitter, and throughput than TCP. The network convergence time is 12.18 ms when the size of data exchanged is set to 64 Bytes.Keywords: Controller, Full-Mesh, RouteFlow, Software Defined Network

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22

Stancu, Alexandru, Alexandru Vulpe, Octavian Fratu, and Simona Halunga. "Wireless Transport Emulator Based on LINC Software Switch." Wireless Personal Communications 97, no. 2 (July 26, 2017): 1711–27. http://dx.doi.org/10.1007/s11277-017-4654-9.

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23

Aldaya, Ivan, Raul Cafini, Walter Cerroni, Carla Raffaelli, and Michele Savi. "Optical switch emulation in programmable software router testbed." Photonic Network Communications 25, no. 1 (November 22, 2012): 10–23. http://dx.doi.org/10.1007/s11107-012-0386-7.

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24

Kiran Kumar, G., E. Parimalasundar, D. Elangovan, P. Sanjeevikumar, Francesco Lannuzzo, and Jens Bo Holm-Nielsen. "Fault Investigation in Cascaded H-Bridge Multilevel Inverter through Fast Fourier Transform and Artificial Neural Network Approach." Energies 13, no. 6 (March 11, 2020): 1299. http://dx.doi.org/10.3390/en13061299.

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In recent times, multilevel inverters are used as a high priority in many sizeable industrial drive applications. However, the reliability and performance of multilevel inverters are affected by the failure of power electronic switches. In this paper, the failure of power electronic switches of multilevel inverters is identified with the help of a high-performance diagnostic system during the open switch and low condition. Experimental and simulation analysis was carried out on five levels cascaded h-bridge multilevel inverter, and its output voltage waveforms were synthesized at different switch fault cases and different modulation index parameter values. Salient frequency-domain features of the output voltage signal were extracted using a Fast Fourier Transform decomposition technique. The real-time work of the proposed fault diagnostic system was implemented through the LabVIEW software. The Offline Artificial neural network was trained using the MATLAB software, and the overall system parameters were transferred to the LabVIEW real-time system. With the proposed method, it is possible to identify the individual faulty switch of multilevel inverters successfully.

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25

Assegie, Tsehay Admassu. "Software defined network emulation with OpenFlow protocol." International Journal of Advances in Applied Sciences 9, no. 1 (March 1, 2020): 70. http://dx.doi.org/10.11591/ijaas.v9.i1.pp70-76.

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In software defined network the network infrastructure layer where the entire network devices, like switches and routers reside is connected with the separate controller layer with the help of standard called OpenFlow. The open flow standard enables different vendor devices like juniper, cisco and Huawei switch to connect to the controller or a software program. The software program controls and manages the network devices. Therefore, software defined network architecture makes the network flexible, cost effective and manageable, enables dynamic provisioning of bandwidth, dynamic scale out and dynamic scale in compared to the traditional network. In this study, the architectures and principles of software defined network is explored by emulating the software defined network employing a mininet.

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Cui, Yunhe, Qing Qian, Guowei Shen, Chun Guo, and Saifei Li. "REVERT: A Network Failure Recovery Method for Data Center Networks." Electronics 9, no. 8 (July 23, 2020): 1187. http://dx.doi.org/10.3390/electronics9081187.

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As a repository that holds computing facilities, storage facilities, network facilities and other facilities, the Software Defined Data Center (SDDC) can provide computing and storage resources for users. For a SDDC, it is important to provide continuous services for users. Hence, in order to achieve high reliability in Software Defined Data Center Networks (SDDCNs), a network failure recovery method for software defined data center networks (REVERT) is proposed to recover failures in SDDCNs. In REVERT, the network failures that occurred in SDDCNs are classified into three types, which are switch failure, failure of links among switches and failure of links between switches and servers. Specially, except recovering the switch failure and failure of links between switches, REVERT can also recover the failures of links between the switches and servers. To achieve that, a failure preprocessing method used to classify the network failures, a data structure for storing and finding the affected flows, a server cluster agent for communicating with the server clustering algorithm and a routing path calculation method are designed in REVERT. Meanwhile, REVERT has been implemented and evaluated on RYU controller and Mininet using three routing algorithms. Compared with the link usage before recovering the network failures, when there are more than 200 flows in the network, the mean link usages only slightly increase at about 1.83 percent. More importantly, the evaluation results also demonstrate that except recovering switch failures, intra-topo link failures, REVERT has the ability of recovering failures of links between servers and edge switches successfully.

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Yasin, Alimuddin, and Salman Suleman. "Pengujian Serangan UDP Flood di Jaringan Software-Defined pada GNS3." Jurnal Teknologi Informasi Indonesia (JTII) 3, no. 1 (June 1, 2018): 15. http://dx.doi.org/10.30869/jtii.v3i1.182.

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Abstractâ€” Software Defined Network (SDN) adalah teknologi baru dalam jaringan komputer. Dimana dalam arsitektur ini control plane terpisah dengan data plane. Controller sebagai control plane dan switch sebagai data plane yang dihubungkan oleh protokol openflow. Teknologi ini masih dalam tahap pengembangan sehingga isu keamanan masih terbuka lebar untuk diteliti terlebih serangan dampak Distrubuted Denial of Service (DDoS) pada switch openflow. Untuk mensimulasikan serangan DDoS di jaringan SDN dipilih software simulator GNS3 untuk mensimulasikan arsitektur jaringan SDN untuk menguji dampak serangan DDoS terhadap kualitas jaringan saat serangan DDoS terjadi. Serangan DDoS dapat mempengaruhi kualitas jaringan di Arsitektur jaringan SDN di GNS3 sehingga mengakitbatkan switch openflow tidak dapat berfungsi sementara waktu

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Zhou, Yi, Xiao Pin Liao, and Jian Bin Xiao. "Simulation and Design on Structure for Experimental Verification of Dielectric Charging of Millimeter-Wave MEMS Switches." Key Engineering Materials 483 (June 2011): 158–63. http://dx.doi.org/10.4028/www.scientific.net/kem.483.158.

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Lifetimes of RF MEMS (Micro-electro-mechanical systems) capacitive switches are hindered by dielectric charging effects. A novel test structure for experimental verification of millimeter-wave MEMS switch dielectric accumulation charge is presented. The structure, which is designed using EM simulation software CST Microwave Studio and HFSS, consists of Coplanar Waveguide (CPW), a 2-way power divider and two symmetric capacitive MEMS switches. The input signal is equally divided into two output signals in the 2-way power divider due to symmetry, and the isolation between two output ports the power divider of is less than -48dB at 35GHz. The designed millimeter-wave capacitive MEMS shunt switch has 0.076dB insertion and -55dB isolation at 35GHz. The two symmetric capacitive MEMS switches in this structure can provide a strong comparability for different switch dielectric accumulation charge situations.

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Rahmawan, Agung Dwi, Syaifuddin Syaifuddin, and Diah Risqiwati. "ANALISA PERFORMANSI CONTROLLER PADA ARSITEKTUR JARINGAN SOFTWARE DEFINED NETWORK (SDN)." Jurnal Repositor 2, no. 12 (December 4, 2020): 1727. http://dx.doi.org/10.22219/repositor.v2i12.75.

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AbstrakSoftware Defined Network (SDN) merupakan sebuah konsep pendekatan baru dalam jaringan untuk mendesain, membangun serta mengelola suatu jaringan komputer. Konsep ini melakukan pemisahan terhadap Data Plane dan Control Plane. Dalam konsep SDN ini terdapat suatu komponen penting yang bertanggung jawab terhadap segala aturan dalam pengelolaan dan pendistribusian informasi terhadap seluruh perangkat jaringan yaitu Controller. Karena peran Controller yang penting maka performa dari Controller perlu diuji sehingga dapat mengetahui kemampuan dari Controller yang digunakan. Dalam penelitian ini dilakukan perbandingan analisis nilai Quality of Services (QoS) terhadap implementasi SDN menggunakan Controller Floodlight dan Ryu dengan menjalankan topologi linear dan mesh dalam jumlah Switch yang beragam mulai dari 4, 8, 12 dan 16 Switch. Selama pengujian berlangsung dari node sumber ke node tujuan yang sama juga dialiri variasi background traffic mulai dari 50 hingga 200 Mbps. Hasil yang didapatkan yaitu Controller Ryu memiliki nilai QoS yang lebih baik dari floodlight pada semua topologi yang diujikan, nilai latency dan jitter pada floodlight lebih tinggi dari ryu serta cenderung meningkat pada traffic 100 Mbps Pada throughput, ryu memiliki nilai lebih tinggi dengan kisaran 856-933 Kbps. Sedangkan pada packet loss floodlight lebih tinggi sementara ryu hanya memiliki rata-rata packet loss sebesar 0,5%. Namun pada pengujian hanya pada jumlah switch, floodlight menjamin dalam tingkat respons serta pengelolaan data yang besar di dalam arsitektur jaringan SDN.Abstract Software Defined Network (SDN) is a concept of a new approach in networking to design, build and manage a computer network. This concept separates the Data Plane and Control Plane. In this SDN concept there is an important component that is responsible for all rules in the management and distribution of information to all network devices that is Controller. Due to the important Controller role then the performance of the Controller needs to be tested so as to know the ability of the Controller to use. In this study, a comparison of Quality of Service (QoS) value analysis on SDN implementation using Floodlight and Ryu Controller by running linear and mesh topology in varying number of Switches ranging from 4, 8, 12 and 16 Switch. During the test from the source node to the same destination node is also varies background traffic ranging from 50 to 200 Mbps. The result is that Controller Ryu has better QoS value than floodlight on all tested topologies, the latency and jitter values on the floodlight are higher than ryu and tend to increase on 100 Mbps traffic. Throughput On ryu. have a higher value with the range of 856-933 Kbps. While the packet loss floodlight higher while ryu only have an average packet loss of 0.5%. But on testing only on the number of switches, the floodlight guarantees great response rates and data management within the SDN network architecture.

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Kadu, Akshay. "Reduced Switch Multilevel Inverter based STATCOM." International Journal for Modern Trends in Science and Technology 6, no. 5 (May 16, 2020): 117–21. http://dx.doi.org/10.46501/ijmtst060521.

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This paper presents an application of reduced switch multilevel inverter topology to STACOM. This topology consists of basic unit in which two switches are connected in series and one H-bridge unit. Multilevel inverter is beneficial in terms of reliability and improved output quality. Multilevel inverter have only drawback of higher number of switches. This reduced switch topology has less number of switches as compared to conventional Cascaded H Bridge Inverter. Compared to direct control method, indirect control method is simple but due to fast response and precise control, direct current control method is quite effective. In this work STACOM is implemented to improve the Power factor of the power system. An extensive digital simulation of the recommended STATCOM and its controller is carried out using MATLAB/SIMULINK software to study system performance. Simulation results prove that using Direct current control technique overall power factor is improved.

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31

Campos, Suene, Regivan Santiago, Manuel A. Martins, and Daniel Figueiredo. "Introduction to reversal fuzzy switch graph." Science of Computer Programming 216 (April 2022): 102776. http://dx.doi.org/10.1016/j.scico.2022.102776.

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Wang, Liang, Prateek Mittal, and Jennifer Rexford. "Data-plane security applications in adversarial settings." ACM SIGCOMM Computer Communication Review 52, no. 2 (April 30, 2022): 2–9. http://dx.doi.org/10.1145/3544912.3544914.

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High-speed programmable switches have emerged as a promising building block for developing performant data-plane applications. In this paper, we argue that the resource constraints and programming model of hardware switches have led to developers adopting problematic design patterns, whose security implications are not widely understood. We bridge the gap by identifying the major challenges and common design pitfalls in switch-based applications in adversarial settings. Examining five recently-proposed switch-based security applications, we find that adversaries can exploit these design pitfalls to completely bypass the protection these applications were designed to provide, or disrupt system operations by introducing collateral damage.

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KJ, Sinu, and G. Ranganathan. "A Photo Voltaic Source Fed Novel Boosting Switched Z-Source Multilevel Inverter." Indonesian Journal of Electrical Engineering and Computer Science 9, no. 1 (January 1, 2018): 20. http://dx.doi.org/10.11591/ijeecs.v9.i1.pp20-23.

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<p>This paper presents a new switched z-source multilevel inverter powered from a photovoltaic source. Addition of a power electronic switch in conventional z-source network provides excellent voltage boosting capability with moderate power rating which makes it suitable for low voltage photo voltaic applications. Proposed topology consists of single dc source, six power switches, two diodes, four capacitors and two inductors comparing to conventional five level schemes proposed topology contains less number of switches and passive elements. This scheme produces voltage waveform with lesser harmonics and shows lesser THD percentage by using different modulation index of multi carrier level shifted PWM technique. Proposed switched z-source multilevel inverter is implemented using MATLAB software and results are presented to verify merits of the scheme. </p>

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Qin, Juan Ying, Cui Fang Liu, and Chang Qing Bi. "The Switch Control of Double-Power Supply System Based on Intelligent Static Switch." Advanced Materials Research 591-593 (November 2012): 1612–16. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1612.

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This article introduces the principle of achieving high precision switch control on double-power supply system of electric fence power & inverting power by intelligent static switch with DSP-TMS320LF2407A as the main control chip and its hardware & software characteristics. The most central part of intelligent static switch is to embed an intelligent soft management system and set up a platform to manage other software, which achieve fast data processing and complex Boolean calculation of system. The intelligent static switch can monitor the magnitude, phase and frequency of electric fence power & inverting power in real time according to present parameter, revise the frequency & phase of standby power in-phase signal which is in a warm-waiting state, make sure they are highly precise in double-power supply system, and achieve “seamless” switch.

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35

Zhang, Ting, and Bin Liu. "Exposing End-to-End Delay in Software-Defined Networking." International Journal of Reconfigurable Computing 2019 (March 4, 2019): 1–12. http://dx.doi.org/10.1155/2019/7363901.

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Software-Defined Networking (SDN) shows us a promising picture to deploy the demanding services in a fast and cost-effective way. Till now, most SDN use cases are deployed in enterprise/campus networks and data center networks. However, when applying SDN to the large-scale networks, such as Wide Area Network (WAN), the end-to-end delay of packet traversal is suspected to be very large and needs to be further investigated. Moreover, stringent time constraint is the cornerstone for real-time applications in SDN. Understanding the packet delay in SDN-based large networks is crucial for the proper design of switch architecture and the optimization of network algorithms such as flow control algorithms. In this paper, we present a thorough systematic exploration on the end-to-end delay in SDN which consists of multiple nodes, fully exposing the components which contribute to the long delay. We disclose that SDN switches cannot completely avoid the generation of flow setup even in proactive mode and conduct data mining on the probability of flow setup. We propose an analytical model for the end-to-end delay. This model takes into account the impact of the different rule installation time consumption on different switches. Considering the delay in switches contributes a large proportion to the entire delay, we conduct various measurements on the delay of a single switch. Results for the delay at different flow setup rates and with different rule priority patterns are presented. Furthermore, we study the impact on packet delay caused by ternary content addressable memory (TCAM) update. We measure parameters in the delay model and find that if SDN is deployed in all segments of WAN, the delay of packet traversal will be increased up to 27.95 times in the worst case in our experimental settings, compared with the delay in conventional network. Such high delay may eventually lead the end-to-end connections fail to complete if no additional measures are taken.

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Hessam, Ghandi, Ghassan Saba, and M. Iyad Alkhayat. "A new approach for detecting violation of data plane integrity in Software Defined Networks." Journal of Computer Security 29, no. 3 (May 7, 2021): 341–58. http://dx.doi.org/10.3233/jcs-200094.

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The scale of Software Defined Networks (SDN) is expanding rapidly and the demands for security reinforcement are increasing. SDN creates new targets for potential security threats such as the SDN controller and networking devices in the data plane. Violation of data plane integrity might lead to abnormal behaviors of the overall network. In this paper, we propose a new security approach for OpenFlow-based SDN in order to detect violation of switches flow tables integrity and successfully locate the compromised switches online. We cover all aspects of integrity violation including flow rule adding, modifying and removing by an unauthorized entity. We achieve this by using the cookie field in the OpenFlow protocol to put in a suitable digest (hash) value for each flow entry. Moreover, we optimize our method performance by calculating a global digest value for the entire switch’s flow table that decides whether a switch is suspected of being compromised. Our method is also able to determine and handle false alarms that affect the coherence of a corresponding table digest. The implementation is a reactive java module integrated with the Floodlight controller. In addition, we introduce a performance evaluation for three different SDN topologies.

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37

Petrov, I. S. "Systems for Compromised Switch Detection in Software-Defined Networking." INFORMACIONNYE TEHNOLOGII 25, no. 3 (March 22, 2019): 131–42. http://dx.doi.org/10.17587/it.25.131-142.

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38

Cheng, Guozhen, and Hongchang Chen. "Game model for switch migrations in software‐defined network." Electronics Letters 50, no. 23 (November 2014): 1699–700. http://dx.doi.org/10.1049/el.2014.2086.

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39

Manteghi, M. "A Switch-Band Antenna for Software-Defined Radio Applications." IEEE Antennas and Wireless Propagation Letters 8 (2009): 3–5. http://dx.doi.org/10.1109/lawp.2008.2005256.

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Williams, Jill Schlabig. "Switch Software Improves Reliability of Physiological Network, Patient Safety." Biomedical Instrumentation & Technology 40, no. 6 (November 1, 2006): 469–70. http://dx.doi.org/10.2345/i0899-8205-40-6-469.1.

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41

AL-Tam, F., and N. Correia. "Fractional switch migration in multi-controller software-defined networking." Computer Networks 157 (July 2019): 1–10. http://dx.doi.org/10.1016/j.comnet.2019.04.011.

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42

Julca Coscol, Ángel Bernardo, Christian David Tapia Prado, Francisco Manuel Hilario Falcón, and Cheyer Marcelino Corpus Giraldo. "Qualitative benchmarking study of software for switch performance evaluation." 3C Tecnología_Glosas de innovación aplicadas a la pyme 10, no. 4 (December 14, 2021): 35–49. http://dx.doi.org/10.17993/3ctecno/2021.v10n4e40.35-49.

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43

Ji, Ling. "Software Anti-Interference Design of SCM Control System." Applied Mechanics and Materials 644-650 (September 2014): 667–69. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.667.

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SCM control system requires high reliability and security, the entire control system to operate safely and reliably only when a strong anti-interference capability. In switch input and output, the use of the instruction redundancy methods to achieve the switch signal input and output filtering; in data collection, based on the hardware anti-interference taken arithmetic average filtering method, in order to strengthen its anti-jamming capability. In the system status monitoring, watchdog feature is enabled with the MSP430F449 microcontroller, when the watchdog timer overflows, the system automatically reset, the experiment proved that this method can save hardware resources, flexible design, low cost, single-chip control, it can guarantee the smooth operation of the system.

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44

Zaid, Mohammad, Chang-Hua Lin, Shahrukh Khan, Javed Ahmad, Mohd Tariq, Arshad Mahmood, Adil Sarwar, Basem Alamri, and Ahmad Alahmadi. "A Family of Transformerless Quadratic Boost High Gain DC-DC Converters." Energies 14, no. 14 (July 20, 2021): 4372. http://dx.doi.org/10.3390/en14144372.

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This paper presents three new and improved non-isolated topologies of quadratic boost converters (QBC). Reduced voltage stress across switching devices and high voltage gain with single switch operation are the main advantages of the proposed topologies. These topologies utilize voltage multiplier cells (VMC) made of switched capacitors and switched inductors to increase the converter’s voltage gain. The analysis in continuous conduction mode is discussed in detail. The proposed converter’s voltage gain is higher than the conventional quadratic boost converter, and other recently introduced boost converters. The proposed topologies utilize only a single switch and have continuous input current and low voltage stress across switch, capacitors, and diodes, which leads to the selection of low voltage rating components. The converter’s non-ideal voltage gain is also determined by considering the parasitic capacitance and ON state resistances of switch and diodes. The efficiency analysis incorporating switching and conduction losses of the switching and passive elements is done using PLECS software (Plexim, Zurich, Switzerland). The hardware prototype of the proposed converters is developed and tested for verification.

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45

Xiuhai, Li. "An OpenFlow Switch Model using Kepler GPU." Journal of Software Engineering 8, no. 4 (September 15, 2014): 304–13. http://dx.doi.org/10.3923/jse.2014.304.313.

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46

SUN, Shu-Tao. "Performance Analysis of a Buffered Crossbar Switch." Journal of Software 18, no. 11 (2007): 2800. http://dx.doi.org/10.1360/jos182800.

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47

Pashkov, Vasily N. "Fault-Tolerance Distributed Control Plane for Software Defined Networks." Modeling and Analysis of Information Systems 26, no. 1 (March 15, 2019): 101–21. http://dx.doi.org/10.18255/1818-1015-2019-1-101-121.

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The architecture of the high availability distributed control plane for SDN/OpenFlow networks are considered. High availability is achieved by redundancy of controller instances, active switch-controller communications, computing resources and tools for a controller instance failure and overloading detection and recovery. The proactive backup controller allocation algorithm which allows to minimize the time to repair in the case of a single controller instance failure is discussed. The algorithm for controller load-balancing allows dynamically reconfigure the control plane with a minimum number of switch control transfer operations to avoid controller instance overloading. The initial experimental results of the proposed algorithms for the HA distributed SDN control plane are described.

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CHANDRA, ANUJ, and RAMI MELHEM. "RECONFIGURATION IN FAULT-TOLERANT 3D MESHES." Parallel Processing Letters 05, no. 03 (September 1995): 387–99. http://dx.doi.org/10.1142/s0129626495000369.

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The [Formula: see text] track model for fault tolerant 2D processor arrays is extended to 3D mesh architectures. Non-intersecting, continuous, straight and non-near miss compensation paths are considered. It is shown that when six directions in the 3D mesh are allowed for compensation paths, then switches with 13 states are needed to preserve the 3D mesh topology after faults. The number of switch states reduces to 7 if only 3 directions are allowed for compensation paths. It is also shown that switch reconfiguration after faults is local in the sense that the state of each switch is uniquely determined by the states of the 2 processors connected to it.

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Liu, Yifang, Daner Chen, Yao Zhang, and Tingting Dai. "Simulation and test of the thermal behavior of pressure switch." Modern Physics Letters B 32, no. 11 (April 18, 2018): 1850138. http://dx.doi.org/10.1142/s0217984918501385.

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Little, lightweight, low-power microelectromechanical system (MEMS) pressure switches offer a good development prospect for small, ultra-long, simple atmosphere environments. In order to realize MEMS pressure switch, it is necessary to solve one of the key technologies such as thermal robust optimization. The finite element simulation software is used to analyze the thermal behavior of the pressure switch and the deformation law of the pressure switch film under different temperature. The thermal stress releasing schemes are studied by changing the structure of fixed form and changing the thickness of the substrate, respectively. Finally, the design of the glass substrate thickness of 2.5 mm is used to ensure that the maximum equivalent stress is reduced to a quarter of the original value, only 154 MPa when the structure is in extreme temperature (80[Formula: see text]C). The test results show that after the pressure switch is thermally optimized, the upper and lower electrodes can be reliably contacted to accommodate different operating temperature environments.

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50

Yeo, Sangho, Ye Naing, Taeha Kim, and Sangyoon Oh. "Achieving Balanced Load Distribution with Reinforcement Learning-Based Switch Migration in Distributed SDN Controllers." Electronics 10, no. 2 (January 13, 2021): 162. http://dx.doi.org/10.3390/electronics10020162.

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Distributed controllers in software-defined networking (SDN) become a promising approach because of their scalable and reliable deployments in current SDN environments. Since the network traffic varies with time and space, a static mapping between switches and controllers causes uneven load distribution among controllers. Dynamic migration of switches methods can provide a balanced load distribution between SDN controllers. Recently, existing reinforcement learning (RL) methods for dynamic switch migration such as MARVEL are modeling the load balancing of each controller as linear optimization. Even if it is widely used for network flow modeling, this type of linear optimization is not well fitted to the real-world workload of SDN controllers because correlations between resource types are unexpectedly and continuously changed. Consequently, using the linear model for resource utilization makes it difficult to distinguish which resource types are currently overloaded. In addition, this yields a high time cost. In this paper, we propose a reinforcement learning-based switch and controller selection scheme for switch migration, switch-aware reinforcement learning load balancing (SAR-LB). SAR-LB uses the utilization ratio of various resource types in both controllers and switches as the inputs of the neural network. It also considers switches as RL agents to reduce the action space of learning, while it considers all cases of migrations. Our experimental results show that SAR-LB achieved better (close to the even) load distribution among SDN controllers because of the accurate decision-making of switch migration. The proposed scheme achieves better normalized standard deviation among distributed SDN controllers than existing schemes by up to 34%.

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