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Bandwidth constrained QoS routing scheme for MPLS traffic engineering

Journal of Systems Engineering and Electronics 2004年第4期15卷 735-740页

作者： LiZhenyu ZhangZhongzhao communicationresearchcenterofharbininstituteoftechnology Harbin150001P.R.China

Traffic engineering has been essential to optimize the utilization of network resource and to provide for QoS, QoS routing is a basic component of traffic engineering in MPLS networks, Aiming at some shortages of certain existing routing algorithms, we propose an efficient bandwidth constrained QoS routing scheme with additional traffic engineering objectives. The objectives of traffic engineering considered in our algorithm are to reduce the blocking probability of requests and to evenly distribute the traffic load. Accordingly, the algorithm avoids using critical links as far as possible by assigning large weights to them as a function of their criticality. The critical links can be specified according to max-flow reduction weight, a new link weight introduced by the algorithm. Then, a new defined additive metric, path saturation, is used to select optimal path. Extensive simulations are carried out to evaluate the performance of the proposed algorithm in terms of call blocking probability and link resource utilization. Compared to other several routing algorithms, the simulation results show the new algorithm performs well.

关键词： Routing Bandwidth Quality of service Measurement Algorithm design and analysis Telecommunication traffic Multiprotocol label switching

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Research on performance of ethernet interface in network centric warfare

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Journal of Systems Engineering and Electronics 2004年第4期15卷 546-552页

作者： LiangYongsheng ZhangNaitong communicationresearchcenterofharbininstituteoftechnology Harbin150001P.R.China

The concept of network centric warfare (NCW) and its character, high requirement of real-time synchronization are introduced. The distributed equal-node network architecture in NCW is presented. Based on theoretical analysis on ethemet interface performance, this paper presents that forwarding latency between ethemet interface devices is a key influence factor of real-time synchronization in NCW. Ethemet fundamental is briefly introduced. The model between a switch under test (SUT) and a smartbits card is presented and used for two interconnecting switches in NCW. On condition that ignoring the latency of connecting fiber or twisted pairs and processing latency of the smartbits test system, this paper presents that dock frequency tolerance (CFT) between a SUT and a smartbits card is a leading influence factor of forwarding latency of an ethemet switch. The formulae to calculate internal forwarding latency and forwarding latency caused by its CFT are deduced. Theoretical calculation on forwarding latency of an ethemet switch based on the given CFT and test time is implemented. Experimental study on primary forwarding latency and secondary forwarding latency is implemented and forwarding latency between the SUT and the smartbits card is measured, thus testifying the accuracy of the above theoretical analysis that the CFT is a key influence factor of forwarding latency. The measures to satisfy the needs of forwarding latency in NCW are presented.

关键词： Clocks Switches Real time systems Detectors Throughput Performance evaluation Propagation losses

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