共查询到18条相似文献,搜索用时 140 毫秒
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针对自动变换光网络组播信令过程中存在的安全威胁,提出了一种高效的基于GMPLS RSVP-TE的安全组播信令协议。该协议采用P2MP(point-to-multipoint)信令模型,通过数字签名和消息反馈等安全机制,对信令消息中的不变对象和重要可变对象实施保护。考虑到组播成员的动态变化特性,采用高效的组密钥管理策略保证组通信的前向安全性和后向安全性。经仿真实验及分析表明,该协议在保证安全建立组播树的同时,取得了较好的连接阻塞性能和较低的密钥更新时延。 相似文献
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本文主要针对自动交换光网络ASON的核心部分一控制平面进行研究.从ASON的结构切入,论证了控制平面的引入是ASON具有智能性的必要条件.GMPLS技术作为最易于实现控制平而的方法,讨论了RSVP-TE中LSP的连接、删除和状态刷新.对GMPLS生存机制中故障LSP的4中恢复方式的通道建立及恢复时间进行了分析和比较,从而得出资源预留综合考虑下是现阶段最优的恢复方式的结论,并对单点故障时各恢复方式在连接影响和业务丢失率方面进行相互比较,突出预置重路由的特点:恢复速度快,网络恢复能力的可预见性好. 相似文献
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在实际应用中,以IP网为基础的通用多协议标签交换(GMPLS)控制平面的可靠性尚不能满足自动交换光网络(ASON)电信级的要求,针对这一情况,文章主要探讨了GMPLS信令RSVP-TE的扩展,为建立保护光通道实现路由排除功能,对排除路由对象(XRO,Exclude Route Object)和显示排除路由对象(EXRS,Explicit Exclude Route Subobject)两个对象进行了扩展。 相似文献
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随着网络容量的不断扩大,提高核心网络效率和动态分配网络带宽的需求越来越迫切。智能光网络是未来光网络的发展方向,控制平面是实现智能光网络的核心。自动交换光网络(ASON )引入了通用多协议标签交换( GMPLS )控制平面,其中链路管理协议是为管理流量工程链路(TE link)开发的新技术。文中介绍了 ASON 中 GMPLS 控制平面及其主要功能,在此基础上对其中链路管理协议的 4 种基本功能(控制信道管理、链路属性关联、链路连通性验证及故障管理)进行具体分析。 相似文献
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通用多协议标记交换(GMPLS)是MPLS向光网络扩展的必然产物,它为了适应对智能光网络进行动态控制和传送信令的要求而对传统的MPLS进行了扩展、更新。使用GMPLS可以为用户动态地提供网络资源,以及实现网络的保护和恢复功能。本文首先介绍了GMPLS的主要内容,接着对GMPLS和MPLS进行了比较,最后阐述了GMPLS在智能光网络控制平面的应用。 相似文献
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基于GMPLS协议的ASON试验平台 总被引:1,自引:0,他引:1
文章介绍了清华大学自主研发的基于通用多协议标签交换(GMPLS)协议的自动交换光网络(ASON)试验平台.试验平台由3个层面构成,分别为传送层面、控制层面和管理层面.传送层面由4个光交叉连接(OXC)和1个光上下路复用器(OADM)构成的传送网络组成;控制平面由多个协议模块构成,包括链路管理、路由和信令模块,这些协议的实现都是基于互联网工程任务小组(IETF)的GMPLS协议开发和实现的;管理平面完成配置管理和故障管理,包括网元管理以及软永久连接的触发等.试验平台支持动态可配置的网络拓扑、自动邻居发现、受限路由以及光层快速的保护和恢复功能. 相似文献
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通用多协议标签交换(GMPLS)是目前公认的实现ASON网络控制平面的核心协议簇。链路管理协议(LMP)是GMPLS中专门负责网络节点之间所有链路资源的管理部分。文中详细介绍了LMP协议的内容与功能,重点分析了其在光网络中的重要应用,并通过网络编程仿真说明了其链路管理过程。 相似文献
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Generalized Multiprotocol Label Switching (GMPLS) networks is capable of allocating suitable route based on the size of the network and computational constraints. In this paper, we propose a connection provisioning strategy for updating the Traffic Engineering Database of Path Computation Element (PCE) in GMPLS optical networks. Control and management plane are used for resource optimization in PCE-based centralized network. We have also proposed connection provisioning for Label Switched Path (LSP) to optimize the resources and to maximize the connection establishment. For provisioning a connection with LSP requests, we have formulated the Integer Linear Programming and constraints to minimize the blocking of connections and network performance. The results obtained shows that the proposed strategy has better network resource utilization with minimum blocking of connections. 相似文献
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《Lightwave Technology, Journal of》2009,27(19):4338-4347
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《Lightwave Technology, Journal of》2008,26(14):2029-2036
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Tai Won Um Jun Kyun Choi Young Ae Kim Hyeong Ho Lee Hae Won Jung Sang Gug Jong 《ETRI Journal》2002,24(2):69-80
This paper reviews the existing research activities on signaling and control procedures for IP over optical networks. We focus on the IP‐centric signaling and control architecture based on the generalized multi‐protocol label switching (GMPLS) protocol and analyze various scenarios and technical issues for deploying the IP over an optical network. We analyze the signaling and operations and administration and maintenance requirements for integrating an IP network and an optical network in order to cope with the high bandwidth and poor resource granularity of the optical network, including the optical cross‐connect system. On the basis of network architecture and a reference configuration model, we investigate the GMPLS‐based control architecture and interconnection model appropriate for controlling IP bandwidth and optical lambda resources. The signaling and control procedure based on GMPLS on optical user‐network interface and network‐network interface are comparatively investigated to provide the optical lightpath. We also study protection and restoration procedures to protect link failure when it applies to GMPLS signaling. 相似文献
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光网络统一控制平面的出现使得光网络的发展进入了一个灵活、智能、自动交换的新阶段。对光网络的统一控制平面的关键信令技术GMPLS进行了全面分析,包括GMPLS扩展的协议结构、GMPLS增强的标记格式等,尤其对GMPLS信令的双向通路连接建立过程进行了详细的分析。最后给出了实现GMPLS控制功能的结构框架。 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