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在总结、比较当前各种GMPLS恢复机制性能的基础上,结合了保护机制恢复时间快、恢复机制的资源利用率高的优点,提出了一种动态最优恢复路由选择算法.该算法不仅在出现多处网络故障的情况下,根据预留的恢复路径,动态寻找分配恢复路径,而且可以保证保护路径的资源利用率最优. 相似文献
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介绍了ITU—T和IETF在ASON保护和恢复方面所进行的工作,对保护机制和故障管理等 问题进行了分析和比较,并探讨了保护和恢复机制在ASON网络中的应用。 相似文献
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链路故障的恢复,不仅仅是选择一条连通的备份路径问题,还应考虑网络业务故障恢复过程中的QoS需求。针对此问题,该文基于多备份路径策略,构建概率关联故障模型和重路由流量丢弃量优化目标。并基于该优化目标,以业务的QoS需求为约束,建立故障恢复问题的数学模型,提出一种QoS约束的链路故障多备份路径恢复算法。该算法构建单条备份路径时,以最大程度地减少重路由流量丢弃为目标,并采用改进的QoS约束的k最短路径法进行拼接,且给与高优先级链路更多的保护资源。此外还证明了算法的正确性并分析了时间空间复杂度。在NS2环境下的仿真结果表明,该算法显著提升了链路故障恢复率和重路由流量QoS满足率,且QoS约束条件越强,相较于其它算法优势越明显。 相似文献
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在网络技术日益提高的背景下,智能光网技术应运而生,并取得了理想应用效果,如进一步提高了网络资源的利用率。为推动智能光网技术的进一步发展,本文针对智能光网的关键技术进行研究,首先概述了智能光网的概念及优点,然后重点讨论了智能光网的关键技术,主要包括路由选择和波长分配技术、传送技术、控制平面技术等。 相似文献
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随着企业对VPN需求的不断增加,在智能光网络上构建OVPN将成为VPN技术一个新的发展方向。在数据网VPN的基础上引入OVPN的概念,介绍了实现OVPN的两种途径:基于硬件的OVPN和基于ASON的OVPN。重点阐述了在以GMPLS为基础的ASON网络中构建OVPN的参考模型、实现方法、特点等,指出OVPN作为智能光网络的一项重要新业务,必将对光网络从承裁网转变成可运营网络发挥重大作用。 相似文献
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娄斌 《电子技术与软件工程》2022,(16):160-163
本文将从现代角度出发,围绕计算机数据库展开研究,首先阐述了计算机数据库的基本特点,其次分析出计算机数据库备份与恢复技术的相关含义,最后提出几点具体的实践策略,希望能够为相关人士提供有效参考。 相似文献
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为了提高弹性光网络(EON)的频谱利用率,提出一种基于自适应调制的碎片感知共享通路保护算法。该算法利用频谱块承载权重(SBBW)衡量不同频谱块接纳业务的能力,优先选择SBBW大的链路构成候选工作路径,并利用分配前、后SBBW差值最小的频谱块建立工作路径。然后选择可用频谱块和保护频谱块承载能力大的链路构成候选保护路径,建立保护路径时优先使用分配前、后SBBW差值最小的保护频谱块,建立失败时才选择分配前、后SBBW差值最小的可用频谱块。仿真结果表明:该算法可以降低带宽阻塞率、频谱碎片率和备用容量冗余。 相似文献
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In this paper, we investigate the effect of path establishment method priorities over routing performance in mixed line rate (MLR) wavelength division multiplexed (WDM) optical networks. The survivable routing with rate and wavelength assignment (SRRWA) problem is presented and an efficient shared backup path protection solution is proposed. We prepared detailed simulation scenarios with all possible prioritizations and observed their performances. The simulation results show that assigning higher priority to single hop methods as compared with multi‐hop methods yields better performance. In both methods, it has been observed that assigning higher priority to grooming reduces the communication cost and the traffic blocking ratio while enhancing the resource utilization. 相似文献
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Amir Esmailpour Nidal Nasser Jehad Al Dallal 《International Journal of Communication Systems》2013,26(12):1520-1542
Wireless mesh networks (WMNs) have a proven record in providing viable solutions for some of the fundamental issues in wireless networks such as capacity and range limitations. WMN infrastructure includes clusters of mobile ad‐hoc networks connected through a fixed backbone of mesh routers. The mesh network can be constrained severely because of various reasons, which could result in performance degradation such as a drop in throughput or long delays. Solutions to this problem often focus on multipath or multichannel extensions to the existing ad‐hoc routing protocols. In this paper, we propose a novel solution by introducing an alternative path to the mesh backbone that traverses the mobile ad‐hoc networks part of the WMN. The new routing solution allows the mobile nodes (MNs) to establish direct communication among peers without going through the backbone. The proposed alternative ad‐hoc path is used only when the mesh backbone is severely constrained. We also propose, for the first time in WMNs, using MNs with two interfaces, one used in the mesh backbone communication and the other engaged in the ad‐hoc network. A scheme is presented for making the MN aware of link quality measures by providing throughput values to the ad‐hoc on‐demand distance vector protocol. We use piggybacking on route reply messages in ad‐hoc on‐demand distance vector to avoid incurring additional costs. We implemented our solution in an OPNET simulator and evaluated its performance under a variety of conditions. Simulation results show that the alternative ad‐hoc path provides higher throughput and lower delays. Delay analysis show that the throughput improvement does not impose additional costs. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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The Intelligent Optical Network (ION) has emerged as a promising technology in the development of optical networks. ION has
a separate control plane, where real-time processing is a most substantial feature. However, the complicated control and management
infrastructure requires multiple protocols to cooperate in the same signaling network, and jitter may impair real-time processing,
like fast failure detection. In this article, the interactivity of failure detection and network congestion control will be
analyzed and proposed solutions will be evaluated by simulations. The failure detection protocol in the control plane is inherited
from IP networks. However, there is a scalability problem in the ION when requiring fast detection time. Congestion in the
signaling network may be caused by various events. It could be fatal when interacting with fast failure detection would trigger
a positive feedback. Several solutions will be presented and analyzed with respect to fast and scalable failure detection
and congestion control. We performed a series of intensive simulations to study the interactivity of failure detection and
congestion control on the 32-node USNET. The simulation results show that the proposed Enhanced Hello protocol performs well
in both fast detection mode and congestion state, especially with far less false failure alarms. The Retransmission Reduction
mechanism, which is designed to alleviate congestion, can avoid message loss in some degree, but gives little improvement
in other aspects. 相似文献
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网络拓扑的动态变化是AdHoc网络的主要特点,也是影响通信性能的主要因素。DSR协议是一种按需式路由协议,当发现1个链路断开的时候,就要重新建立1个新的路径,在路径重建的过程中会使包丢失,并且会造成重要的吞吐量的降低。鉴此,提出一种高效的路由协议。在移动预测的机制下,该协议能够选取另外一条后备路径来实现,减少包的丢失。 相似文献