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未来骨干网同时承载巨大的IP流量和话音流量,需要新的流量工程解决方案,提高资源利用率,保证服务质量。本文首先介绍了MPLS和GMPLS,然后讨论用GMPLS解决流量工程问题的途径。 相似文献
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引入并改进NSGA-II算法,用于解决GMPLS光网络的流量工程问题.首先给出流量工程问题数学模型;然后提出一个基于线性规划和NSGA-II的混合启发性算法;最后对算法进行仿真,将结果与车比雪夫精确算法所得结果进行比较,验证了本算法的有效性. 相似文献
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GMPLS技术及其路由算法 总被引:1,自引:0,他引:1
通用多协议标签交换( GMPLS)是由多协议标签交换(MPLS)发展而来,它是MPLS向光层扩展的必然产物.GMPLS将时隙、波长和光纤端口作为标签用子数据转发,通过采用扩展的信令、路由协议和新增的链路管理机制以适应对智能光网络进行动态控制和传送信令的要求,动态提供网络资源并增加网络的存活性.本文着重比较了GMPLS与MPLS,说明其如何改进MPLS,并提供了GMPLS在光控制平面的应用解决方案.最后,谨慎分析了GMPLS的前景及其需要解决的问题 相似文献
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文章介绍了通用多协议标签交换(GMPLS)资源预留-流量工程( RSVP-TE)协议,它主要用于非IP网络,尤其是在光网络中动态地完成连接的建立、保持和删除.文中介绍了除RSVP-TE协议中的对象以外新引入的一些对象和消息,并通过实例阐述了在光网络中利用GMPLS RSVP-TE进行连接建立、删除以及控制平面重启的过程.最后对GMPLS RSVP-TE中的连接建立过程和RSVP-TE中的连接建立过程进行了比较总结. 相似文献
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简述了MPLS(多协议标签交换)和MPLS流量工程的基本原理,提出了流量工程实现的思路和流程;在以RSVP-TE Daemon for Diff-serv over MPLS under Linux软件包构建的MPLS实验平台上,设计了一个基于MPLS流量工程的流量保护自动处理机——实现了自动重路由、自动流量切换,以及自动弹性恢复。 相似文献
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多协议标签交换(MPLS)技术的成熟和扩展将推进基础网络的智能化和下一代光网络的实现。在对流量工程和MPLS体系结构分析的基础上,讨论了利用MPLS实现流量工程的优势。利用网络仿真器NS2设计了OSPF(开放最短路径优先)路由协议和MPLS流量工程的实例。通过对仿真结果的比较和分析,可以看出MPLS流量工程可以有效地实现网络负载均衡和恢复机制,提高网络服务质量。 相似文献
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In wavelength-routed optical networks, the high-delay introduced by the optical switching fabric for resource reservation
increases critically the lightpath setup delay. In order to minimize the setup delay, Generalized Multi-protocol Label Switching
(GMPLS) introduced the concept of Suggested Label Object (SL), which allows to start reserving and configuring the hardware
with a proposed wavelength from the source node to the destination node. This solution is not optimal in wavelength selective
networks (WSN) (i.e., without wavelengths converters). The need of guaranteeing the wavelength continuity constraint for end-to-end
optical connections, combined with the lack of global wavelength-based link information (the source node is not aware of which
wavelengths are available on each link), makes that the likelihood of establishing a lightpath using the proposed suggested
label may be minimum. In this article, we propose an enhancement to the current GMPLS RSVP-TE signaling protocol with offset
time-based provisioning that minimizes the lightpath setup, improving the overall network performance in terms of blocking
probability and setup delay. Experimental performance evaluation has been carried out in ADRENALINE testbed, a GMPLS-based
intelligent all-optical transport network. 相似文献
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In this paper, we study regenerator placement and traffic engineering of restorable paths in generalized multiprotocol label switching (GMPLS) networks. Regenerators are necessary in optical networks in order to cope with transmission impairments. We study a network architecture where regenerators are placed only at selected nodes for decreasing cost of regeneration. We propose two heuristic algorithms for optimum placement of these regenerators. Performances of these algorithms in terms of required number of regenerators and computational complexity are evaluated. In this network architecture with sparse regeneration, off-line computation of working and restoration paths is studied for traffic engineering with path rerouting as the restoration scheme. We study two approaches for selecting working and restoration paths from a set of candidate paths and formulate each method as an integer linear programming (ILP) problem. A traffic uncertainty model is developed in order to compare these methods based on their robustness with respect to changing traffic patterns. Traffic engineering methods are compared based on number of additional demands resulting from traffic uncertainties that can be carried over the network. Proposed heuristic regenerator placement algorithms are also evaluated from a traffic engineering point of view. 相似文献
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对通用多协议标记交换(GMPLS)协议的三个组成部分(路由协议、信令协议和链路管理协议)的功能分别作了简要介绍. 相似文献
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GMPLS(通用多协议标签交换)是MPLS技术向光网络发展的产物。描述GMPLS和MPLS控制平台的区别,介绍引用GMPLS协议作为控制平面的OBS网络。提出的网络结构是在OBS的突发控制包中用通用标签代替源节点和目的节点地址,并使用GMPLS协议栈对路由协议、信令功能以及链路管理协议进行增强和扩展以便更好地支持OBS网络。 相似文献
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本文介绍了基于MPLS的流量工程机制,着重就其中的路径管理技术进行了分析,并分别给出了基于不同度量参数的路由算法。 相似文献
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本文从地域通信网的特点出发,分析了以前所使用的路由选择方法的优缺点,提出了网控支持的基于业务量的动态中币管理方法,并描述了该路由管理方法的分层结构和在地域网网络管理系统中的具体实现。 相似文献
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最小化路径代价和流量均衡模型及算法 总被引:1,自引:0,他引:1
流量均衡是流量工程中为避免网络拥塞经常采用的路由优化目标,如何选择路径以使流量达到均衡分布是流量路由的研究热点和难点.为了最小化网络拥塞,该文在指出网络拥塞决定于流量路由时所选路径的拥塞特征后,建立了流量分布的最小化路径代价和模型.在流量路由选择路径时,提出基于瓶颈链路的最小代价路径路由算法.在实际的网络拓扑和流量矩阵数据基础上对所提模型及算法进行了实验验证,结果显示:在网络负载较大时最大链路利用率相对于已有模型可降低近20%. 相似文献
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GUO Ai-huang LIAO Shu-yan 《半导体光子学与技术》2006,12(1):47-50
General multi-protocol label switching (GMPLS) based on traffic engineering is one of the possible methods to implement all-optical network. This method implements the network with IP technique and guarantees the quality of service with traffic engineering. Based on the establishment of selecting schemes of optical path and methods of traffic calculation, the wavelength routing algorithm of all-optical network based on traffic engineering is presented by combining with prior route of shortest path and traffic engineering, the algorithm procedures are given, and the actual examples are introduced as well as the analysis on simulation calculation. This research results have certain significance for the achievement of optical switching technique of all-optical network. 相似文献