共查询到18条相似文献,搜索用时 687 毫秒
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目前对于智能光网络(ION)生存性方面的研究主要是针对光网络本身,基于静态的资源配置和管理机制对于快速变化的业务需求而言缺乏灵活性,难以满足未来智能光网络中复杂业务的需求。基于业务的智能光网络生存性策略,可以解决现有网络生存性策略与业务侧的生存性需求之间的差异。通过将对生存性需求的描述和定义从网络侧转移到业务侧,以业务对生存性的需求为核心,能很好地实现智能光网络中对生存性策略的控制和实现。 相似文献
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区分可靠性的通路保护方案既能为光网络中具有不同可靠性需求的业务提供有效的故障保护,又能优化网络资源的利用,是一种高效的生存性机制。但目前此类问题的研究主要是集中于传统的单域光网络中,所得的研究成果无法直接运用于具有多域特点的下一代光网络中。针对这一问题,在对以往通路保护算法进行改进的基础上提出了一种适用于多域光网络中的支持区分可靠性的通路保护算法,并对其性能进行了计算机仿真研究。仿真结果表明,该算法不仅能满足多域光网络中不同业务的可靠性需求,而且能提高网络资源的利用率、降低业务连接的阻塞率。 相似文献
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智能光网络的多层生存性技术 总被引:2,自引:0,他引:2
文章对多层网络生存性问题、独立的网络生存性配置方案和多层网络生存性配置方案进行了概括和分析,对基于IP,GMPLS/Optical智能光网络多层结构的调整策略进行了研究,并讨论了基于智能光网络的统一控制平面、利用层间信令协调机制的集成多层网络生存性方案。 相似文献
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Hamza Drid Samer Lahoud Bernard Cousin Miklós Molnár 《Photonic Network Communications》2010,19(1):81-89
Survivability is becoming an important issue in optical networks due to the huge bandwidth offered by optical technology.
Many works have studied network survivability. The majority of these works are destined for single-domain networks. In this
work, we address the survivability of multi-domain optical networks. This paper provides a classification of the existing
protection solutions proposed for multi-domain networks and analyses their advantages and limitations. We propose a new solution
for multi-domain optical networks based on p-cycles (pre-configured cycles). For scalability and security reasons, we also
propose a topology aggregation model adapted to p-cycle computations. This aggregation model allows our proposed solution
to find a trade-off between two competing goals: efficient use of backup resources and short running time. Simulation results
show that the proposed solution is a good trade-off between resource utilization and running time compared to existing solutions. 相似文献
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With the large-scale deployment of optical network equipments, the problems of separated domains management and the multi-domain-based survivability have become the primary challenge in new generation intelligent optical networks. Aimed at resisting multi-link failures in multi-domain optical networks (MDON), a heuristic multi-link fault-tolerant (MLFT) algorithm for survivability in MDON is proposed in this article, which applied Hamiltonian cycle protection and segment-shared protection to establish a novel survivability strategy for either intra-domain??s or inter-domain??s multiple links, respectively. Furthermore, a new virtual-link mapping scheme and link-cost formulas are presented to encourage the appropriate routing selection and load balancing, which can also contributed to better resource utilization ratio and blocking ratio. Simulation results show that MLFT realizes the multi-link fault-tolerant survivability at a lower cost with better performances in redundancy ratio, blocking ratio, and computation complexity. 相似文献
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Lei Guo Xingwei Wang Ying Li Chongshan Wang Hongming Li Hongpeng Wang Xin Liu 《Optical Fiber Technology》2009,15(2):192-196
In multi-domain wavelength-division-multiplexing (WDM) optical networks, the inter-domain routing is a challenge since each single-domain cannot view the full network topology. At the same time, survivability is also an important issue in optical networks since the failures of fiber links or network nodes may lead to a lot of traffic being blocked. In this paper, we study the survivability in multi-domain WDM optical networks, and propose a new survivable mechanism called load balanced domain-by-domain routing (LBDDR). In LBDDR, in order to obtain the efficient inter-domain survivable routes, we present the domain-by-domain routing (DDR) method which can find the intra-domain sub-working path and sub-backup path in each single-domain to form the inter-domain working path and backup path for each demand. In order to reduce the blocking probability, we present the load balanced routing method which can encourage the traffic to be uniformly distributed on the links with more free wavelengths. Simulation results show that, compared with conventional mechanism, LBDDR can obtain better performances. 相似文献
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Wajdi Halabi Kris Steenhaut Marnix Goossens Thu-Huong Truong Ann Nowé 《Photonic Network Communications》2012,23(3):217-229
Routing, connection setup, and path computation are well-known problems in multi-domain networks, which have been largely
analyzed in pure IP (packet) networks. In circuit-switched optical multi-domain networks, there remain, however, a number
of routing and path computation challenges. Traffic grooming means combining a number of low-speed traffic streams so that
the high capacity of each lightpath may be used as efficiently as possible, as path computation implements the core of the
grooming function, it is obvious that solutions for the traffic grooming problem in optical multi-domain networks are still
not sufficiently investigated. In this study we propose a methodology to address the problems of routing, connection setup,
and traffic grooming in optical multi-domain networks, which adapts a two-level hierarchical routing scheme and full-mesh
topology abstraction algorithm to improve routing scalability and lower inter-domain blocking probabilities; additionally
our proposed methodology adapts a scheme for traffic grooming in DWDM multi-domain networks to improve the resources usage.
To test our proposed methodology we propose a detailed IP/MPLS-based ASON/GMPLS multi-domain multilayer test framework. 相似文献
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Although multi-domain survivability is a major concern for operators, few studies have considered the design of post-fault restoration schemes. This paper proposes two such strategies, based upon hierarchical routing and signaling crankback, to handle single and multi-link failure events in multi-domain IP/MPLS networks (also extendible to optical DWDM networks). Specifically, the hierarchical routing strategy relies upon abstracted domain information to compute inter-domain loose routes, whereas the crankback scheme applies signaling re-tries to restore paths in a domain-by-domain manner. The performance of these proposed solutions is then analyzed and compared via simulation. 相似文献
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针对大规模多层多域光网络群故障发生时的网络受损情况,提出基于路径计算单元(PCE)架构的跨域路由算法进行快速恢复,并基于OMNet平台对多层多域路由方案进行了性能仿真分析。结果表明,基于PCE架构的路由策略在群故障发生时能够大大减少网络中的路径计算请求泛洪信息,降低路由计算收敛时间,可以提高全网剩余资源的资源利用率,为业务的快速恢复提供了路由基础。 相似文献
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Shanguo Huang Weihua Lian Xian Zhang Bingli Guo Pei Luo Jie Zhang Wanyi Gu 《Photonic Network Communications》2012,23(2):183-190
The routing issues in multi-layer and multi-domain optical networks have drawn much attention in current research. With the
introduction of the path computation element, routes can be calculated more efficiently in multi-domain optical networks.
However, the optimal degree of routing approach in multi-layer and multi-domain optical networks is also determined by the
clustering algorithms deployed for construction of hierarchical networks. Therefore, it is important to investigate the way
to evaluate the impact of the clustering algorithm on the routing approach (e.g., blocking probability) in optical networks
with dynamic traffic, which has not been studied sufficiently. In this paper, a novel method to describe and evaluate the
clustered structures generated by different clustering algorithms for hierarchical optical networks is proposed. This method
deploys a novel evaluation metric that represents blocking probability of clustered optical networks, so it can be used as
guidelines for designing clustered structures. Besides theoretical analysis, simulations are carried out on different network
topologies and clustered types to validate the effectiveness of the method presented. 相似文献
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Unavailability analysis of long-haul networks 总被引:5,自引:0,他引:5
Network survivability is a key concern in today's network, and will become increasingly important in future optical networks as they carry ever more traffic. Networks are also becoming more complex, with the requirement for increased functionality. Currently, there is a lack of understanding in the industry as to the exact relationship between the choice of network architecture and the meeting of a set availability objective. This paper analyses a number of long-haul network architectures from an unavailability point of view. The long-haul networks analyzed include: networks with diversity, networks with restoration capability, and networks with survivability. Derivations are given for each architecture; formulas for 2 and 4-fiber rings, and dual fed routing are new. A hypothetical reference connection (HRX) and its unavailability objectives are used as references. Networks with restoration capability and networks with survivability meet the proposed objective. Self-healing rings (both 2 and 4-fiber bidirectional line switched rings) and dual fed systems offer the highest level of survivability, by eliminating service impacts caused by cable cuts and equipment failures 相似文献