2007 15th IEEE Workshop on Local & Metropolitan Area Networks最新文献_第2页

Enhanced Ethernet for Data Center: Reliable, Channelized and Robust 数据中心增强型以太网:可靠、信道化和鲁棒性

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295977

M. Wadekar

{"title":"Enhanced Ethernet for Data Center: Reliable, Channelized and Robust","authors":"M. Wadekar","doi":"10.1109/LANMAN.2007.4295977","DOIUrl":"https://doi.org/10.1109/LANMAN.2007.4295977","url":null,"abstract":"Data Centers today deploy multiple fabrics for LAN, SAN and IPC traffic. This introduces significant cost, complexity and management challenges. Hence there is strong demand for consolidating these multiple fabrics. Ethernet is default fabric used primarily for LAN traffic and it is low-cost, well-known, widely available, and broadly compatible. So, it makes an ideal candidate for such IO consolidation. However, current Ethernet suffers from certain deficiencies that need to be addressed. Legacy Ethernet suffers from 3 main issues (a) Lack of congestion management mechanism -which results in packet drops when network is congested. This also results in unpredictable latencies for the traffic through these congested networks, (b) No standard mechanism for traffic differentiation on the link which will protect all the traffic types on consolidated link. Only mechanism available is 802. lp strict prioritization without any bandwidth assurance, (c) Poor utilization of available bandwidth in the network. Spanning Tree Protocol tends to remove links that can cause loops in the network. This results in lower bisectional bandwidth. Underlying Layer 2 protocols do not allow any multipathing techniques that are available in other technologies like Fiber Channel, Infiniband etc. This paper presents a framework of solution that includes multiple enhancements to Ethernet network -that will improve legacy Ethernet significantly for Data Center deployment. Some of these enhancements are being pursued in IEEE and IETF for standardization. IEEE 802.1Qau Task Force is focusing on improving congestion management capabilities of Ethernet IEEE 802.1Qat and IETF-TRILL is focusing on improving bisectional bandwidth by allowing L2 multipathing capabilities for complex and large DC deployments. Other efforts include mechanisms for better traffic differentiation and improved link level flow control for data center -Ethernet. This paper will elaborate more on congestion management related work.","PeriodicalId":347028,"journal":{"name":"2007 15th IEEE Workshop on Local & Metropolitan Area Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131181788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

On Growth of Parallelism within Routers and Its Impact on Packet Reordering 路由器内并行度的增长及其对数据包重排序的影响

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295990

Abhijit A. Bare, A. Jayasumana, N. Piratla

引用次数: 3

An Efficient Scheduling Algorithm for Time-Driven Switching Networks 一种有效的时间驱动交换网络调度算法

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295981

T. Truong, M. Baldi, Y. Ofek

引用次数: 4

Connection-based Cross-layer Design in Wireless Cellular Networks 无线蜂窝网络中基于连接的跨层设计

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295986

Jing Chen, Minjian Zhao, Shiju Li

引用次数: 1

Measurements of Multicast Television over IP IP上多播电视的测量

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295994

K. Imran, M. Mellia, M. Meo

引用次数: 18

Aggregate Flow Fairness in MANs MANs中的聚合流公平性

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295979

Paul Stoian, I. Cidon

{"title":"Aggregate Flow Fairness in MANs","authors":"Paul Stoian, I. Cidon","doi":"10.1109/LANMAN.2007.4295979","DOIUrl":"https://doi.org/10.1109/LANMAN.2007.4295979","url":null,"abstract":"MANs and backbone networks are shared by \"users\" that can be individuals, organizations as well as communication service providers. Such users produce concurrently a variety of traffic patterns from multiple network locations. Traditional fairness definitions allocate bandwidth to individual source to destination flows. These individual flow fairness definitions generally allocate more bandwidth to users with a larger number of flows, thus creating unfairness at the user level. This paper explores alternative user level fairness criteria. We examine several extensions of the max-min fairness that allocate bandwidth fairly to users. We require the new criteria to be based on a max-min definition, to be backward compatible with the traditional max-min fairness (when each user has a single flow) and not to allocate zero bandwidth to any individual flow. We describe three different criteria for fair bandwidth allocation to users. The first is a weighted max-min criteria, achieving user fairness by the weights assigned to each flow; The second attempts to balance the user allocation separately over each link; Finally, we introduce a novel scheme termed the redefined vector-space fairness that is based on a lexicographical maximization of both user and individual flows. This paper evaluates the three fairness definitions both behaviorally and numerically. The simulation results show a clear advantage for the redefined vector-space fairness both in terms of user fairness and overall throughput.","PeriodicalId":347028,"journal":{"name":"2007 15th IEEE Workshop on Local & Metropolitan Area Networks","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123711977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Persistent Pseudo-Clearance Problem in IEEE802.11 Mesh Networks and its Multicast Based Solutions IEEE802.11 Mesh网络中的持久伪清除问题及其基于组播的解决方案

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295966

Jian Zhang, Y. Chen, I. Marsic

{"title":"Persistent Pseudo-Clearance Problem in IEEE802.11 Mesh Networks and its Multicast Based Solutions","authors":"Jian Zhang, Y. Chen, I. Marsic","doi":"10.1109/LANMAN.2007.4295966","DOIUrl":"https://doi.org/10.1109/LANMAN.2007.4295966","url":null,"abstract":"Wireless mesh networks are flexible solutions to extend services from wireless LANs. The current IEEE 802.11 Specification, however, needs to be modified in various ways to be a suitable technology for this purpose. In particular, in order to handle the well-known hidden node problem (HNP), the Specification adopts MACAW by employing an RTS/CTS/DATA/ACK 4-way handshake. Some flaws of this scheme have been noticed, e.g. the Masked Node Problem (MNP). In this work, we identify a critical problem of the Specification's 4-way handshake, called persistent pseudo-clearance (PPC). PPC occurs when for two sender/receiver pairs a CTS from one pair's receiver collides with the DATA frames of the other pair. This logjam can persist for a period of time despite of the random backoff the senders employ. The persistent frame losses in PPC can cause more serious problems. The effect of giving up a frame transfer after reaching the maximum number of retries can propagate to upper layers, causing routing errors or TCP sender backoff. Multicast RTS (or MRTS) provides a good solution framework to break the cycle of losses and retransmissions between such peers. With minimal modification to MRTS, we provide an effective and efficient solution to PPC. Our experiments show that MRTS breaks the logjam of PPC while fully utilizing the network capacity.","PeriodicalId":347028,"journal":{"name":"2007 15th IEEE Workshop on Local & Metropolitan Area Networks","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121901870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Revisiting Ethernet: Plug-and-play made scalable and efficient 重新审视以太网:即插即用实现了可扩展和高效

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295993

Changhoon Kim, J. Rexford

引用次数: 29

Multi-channel Communication in Free-Space Optical Networks for the Last-mile 最后一英里自由空间光网络中的多信道通信

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295973

J. Akella, M. Yuksel, S. Kalyanaraman

引用次数: 34

QoS in GMPLS based IP/DWDM Metro Networks 基于GMPLS的IP/DWDM城域网络的QoS

2007 15th IEEE Workshop on Local & Metropolitan Area Networks Pub Date : 2007-06-10 DOI: 10.1109/LANMAN.2007.4295980

W. Colitti, K. Steenhaut, A. Nowé

{"title":"QoS in GMPLS based IP/DWDM Metro Networks","authors":"W. Colitti, K. Steenhaut, A. Nowé","doi":"10.1109/LANMAN.2007.4295980","DOIUrl":"https://doi.org/10.1109/LANMAN.2007.4295980","url":null,"abstract":"Due to the unpredictability of IP traffic, MANs are migrating from SONET/SDH ring architectures to DWDM mesh infrastructures. Firstly, the fast advance in optical technologies has provided DWDM networks with extremely high bandwidth capability (i.e. OC-192 and OC-768). Secondly, Generalized Multi Protocol Label Switching (GMPLS) and Multilayer Traffic Engineering (MTE) paradigms have turned them into highly flexible, scalable and cost efficient infrastructures able to improve service provider's return on investment (ROI). With the GMPLS automated control plane, IP/DWDM networks can take advantage of a better integration between the electrical and optical domains and consequently of a more optimized resource usage. GMPLS enables network-state-depended dynamic routing and grooming and provides network operators with the tools to differentiate service types and increase the offered QoS. This paper discusses the benefits of GMPLS as an integrator paradigm in IP/DWDM metro infrastructures and proposes a QoS control framework which allows a network operator to accommodate MPLS/DiffServ traffic on different virtual topologies that can guarantee different QoS levels. The benefits of GMPLS/MTE and of the proposed scheme are discussed by means of simulation results.","PeriodicalId":347028,"journal":{"name":"2007 15th IEEE Workshop on Local & Metropolitan Area Networks","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115777485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0