共查询到19条相似文献,搜索用时 93 毫秒
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在一个分层的网络中,单一的恢复机制不能满足宽带网络生存性的需要。如何协调SDH和ATM层之间恢复策略是一个急需解决的问题。该文提出几种可行的方案进行研究,并比较了它们的优缺点,这对如何设计一个有效的宽带可生存性网络提供了参考依据。 相似文献
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在一个分层的网络中,单一的恢复机制不可能满足宽带网络生存性的需要。如何协调SDH和ATM层之间恢复策略是一个急需解决的问题。该文提出几种可行的方案进行研究,并比较了它们的优缺点,这对如何设计一个有效的宽带可生存性网络提供了参考依据。 相似文献
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IP网络与光网络的融合是当今网络优化的一种趋势。结合IP网和光网络的优势直接适配构建IP over WDM架构,从中引入一个控制平面,形成了IP over ASON模式,由而对其生存性提出了更高的要求。该文首先介绍了IP over ASON模式的架构转变,对其故障管理机制进行了分析,对其故障管理面临的问题提出了改进方法。 相似文献
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ATM网自愈算法的设计和性能分析 总被引:1,自引:0,他引:1
ATM网的自愈机制是确保网络的生存性的关键技术之一,文章在充分考虑了ATM网的特点和以往各种自愈算法局限性的基础上,给出了一种ATM网自愈算法的设计原则,并提出相应的MDF自愈算法,通过与传统的自愈算法进行比较,对这种算法的性能作了详细的分析。 相似文献
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保证关键服务生存性的ATM网络资源管理 总被引:4,自引:0,他引:4
生存性是ATM网络中亟待解决的问题。中针对当前研究中已提出的ATM网络生存性资源管理机制的不足,基于网络中各种服务不同的生存重要性,引入了故障恢复过程中的音乐睚,并改进了预先的空闲容量规划,形成了析的2性资源管理机制,该机制的实施使得网络即使在空穴宋容量不足的情况下,也能够提供关键服务恢复所需的容量,结合优先级恢复机制,实现了充分的关键服务生存性保证机制。 相似文献
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Isaac Woungang Author Vitae Guangyan Ma Author Vitae 《Journal of Systems and Software》2010,83(3):457-466
The Capacity and Flow Assignment problem in self-healing ATM networks is an interesting one from a Generalized Multi-Protocol Label Switching (GMPLS) prospective since IP and ATM protocols are destined to co-exist together in this unified platform. This paper continues the investigation of the path-based design approach of the network survivability problem in existing ATM mesh networks. Our contribution consists in quantifying (1) the effects the selection of candidate paths per node pair has on the restoration ratio, (2) the effect of restoration schemes on the restoration ratio, (3) the effect of failure scenarios on the restoration ratio, and finally (4) the effect of network connectivity on the restoration ratio. Numerical results are presented under representative network topologies, various traffic demands and spare capacity distribution schemes. They provide additional guidelines for the design of survivable ATM mesh-type networks, from a network reliability viewpoint. 相似文献
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《Computer Networks and ISDN Systems #》1997,29(16):1857-1867
This paper presents a reconfiguration scheme resulting in capacity efficiency and fast restoration by utilizing the inherent benefits of Virtual Paths in ATM networks. The unified optimization of bandwidth reconfiguration is addressed so that switched ATM networks can support both service and survivability from a common pool of network spare capacity at a given time. The spare capacity is composed of idle bandwidth and freed up bandwidth from the switch pairs which have a surplus bandwidth. Fast restoration can be achieved by using the pre-optimized network spare bandwidth and preplanned backup Virtual Paths based on the link and node disjoint path routing scheme. The overall operation of the proposed self-healing strategy can be consolidated into distributed fault management functions at ATM layer based on Virtual Paths. The scheme enables a logical Virtual Paths ring protection switching in ATM networks. 相似文献
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《Computer Networks》2008,52(10):1975-1987
Legacy ring-based networks have been deployed in conjunction with SONET/SDH technology to provide survivability to transport networks, and they achieve service recovery within 50 ms after fault detection. Current generalized multiprotocol label switching (GMPLS)-controlled optical transport networks need efficient resilience mechanisms to allow recovery times equivalent to those granted by SONET/SDH networks. In this paper, dedicated and shared optical multiplex section (OMS) protection systems are proposed. Both solutions consist of a mechanism based on extensions of the GMPLS link management protocol (LMP) to properly manage the protection actions, and both utilize a new reconfigurable optical add/drop multiplexer (ROADM) design to support the protection schemes. The performance of both solutions has been experimentally evaluated. 相似文献
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本文介绍了典型的宽带城域网组网技术,包括千兆以太网(GE)技术、POS(Packet over SDH)技术、以SDH为基础的多业务传送平台(MSTP)技术、ATM技术以及弹性分组环(RPR)技术,对它们的特点、优缺点和适用范围进行逐一分析,并给出了宽带城域网的设计原则。 相似文献
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IP over SDH与IP over ATM比较 总被引:3,自引:0,他引:3
现代远程教育是近年来国际教育发展的重要趋势。该文简单介绍了SDH和ATM技术,将IPoverSDH和IPoverATM从协议开销、带宽管理、服务质量、地址分配、路由及流控等方面进行了全面的比较。最后,给出了在现代远程教育中选择这两种技术的指南。对现代远程教育的具体实施具有一定的参考价值。 相似文献
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ATM网络中关键服务生存性保证机制 总被引:1,自引:1,他引:0
生存性是ATM网络中亟待解决的问题,文中在介绍了当前ATM网络中基于VP层的故障恢复机制后,引入生存重要性因子表征网络中不同服务的生存重要性,定义了加权恢复率;基于关键服务生存性保证的要求,提出了关键VC预建立保证连接和关键VC优先的实时恢复两种解决方式,并综合形成了关键服务生存性的保证机制。 相似文献
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Carrier-class Internet service providers (ISPs) must choose an appropriate interface for long-distance data transmissions. The two technologies they most often choose are packet-over-Sonet (POS) and asynchronous transfer mode (ATM). Vendor devices implement POS and ATM to transport data over Sonet (Synchronous Optical NETwork)-a standard for sending data over fiber-optic cables-and SDH (Synchronous Digital Hierarchy), which is Sonet's international equivalent 相似文献