共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
多协议标签交换(MPLS)向通用多协议标签交换(GMPLS)的迁移,实际就是,MPLSTE控制层面向GMPLS控制层面发展的过程。在迁移过程中,MPLS和GMPLS设备或网络同时存在,将出现多种互联情况。标准的互联功能要求,在使用GMPLS技术的同时,保持现有的IP/MPLS网络不受影响。 相似文献
3.
4.
GMPLS是MPLS向光网络扩展的产物,能支持分组交换、时分交换、波长交换和光纤交换。本文先对MPLS做了回顾,然后对GMPLS的标签、层次化LSP、路由与寻址、信令和链路管理等方面一一加以分析,最后对GMPLS的意义提出了一些尚待解决的问题。 相似文献
5.
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
6.
流量工程技术的目的是优化网络运行性能,实现网络资源的最优化利用。而且随着网络迅速发展,网络流量的激增特别是突发流量的增加都对作为骨干网的光网络的性能提出新的要求。本文首先简要介绍MPLS网络的流量工程机制,然后重点介绍GMPLS路由协议的流量工程扩展,以及两种不同约束路由计算机制,分别是在线进行路径计算的基于约束最短路径优先算法和离线路径计算的基于设计路由算法。 相似文献
7.
8.
传统的IP路由协议采用最短路径算法(SPF),极易造成网络的拥塞.流量工程是目前网络中实现负载均衡和提高网络性能的一个重要技术.文中简要介绍了MPLS流量工程,重点分析了MPLS流量工程中所使用的路由协议约束路由,给出了约束的计算方法以及路由度量选择的准则. 相似文献
9.
10.
1.MPLS简介 由于IP缺乏有效的流量和网络带宽管理手段,网络经常会发生拥塞,无法提供服务质量QoS(Qualityof Service)保证,于是人们纷纷寻求能提高网络性能并满足Qos要求的新型解决方案。多协议标记交换MPLS就应运而生了。 在OSI的7层模型中,MPLS位于第二和第三层之间。MPLS协议实现将第三级的包交换转换成第三级的交换。MPLS可以使用各种第二层的协议,MPLS上作组到目前为止已经把在帧中继、ATM和PPP链路以及IEEE802.3局域网上使用的标记实现了标准化。ZMPLS… 相似文献
11.
12.
13.
14.
15.
本文比较了传统IP网络和智能光网络路由技术的差别,介绍了满足QoS需求的智能光网络路由技术和适应智能光网络需要的路径选择算法的基本概念,设计基础,着重描述了在基于GMPLS扩展条件下约束最短路径算法的设计思路. 相似文献
16.
17.
为了优化利用IP层和WDM层网络资源,在WDM网络集成辅助图模型的基础上,提出了一种面向IP/GMPLS over WDM网络的基于代价的优化综合路由算法,即CIR(Cost-basedIntegrated Routing).该算法将IP层和WDM层资源可用信息以代价函数形式给出,并将因网络拓扑结构和网络负载分布不均衡等产生的瓶颈链路以及带宽碎片问题也统一纳入考虑,由此将LSP建立问题转化为在集成辅助图上找出一条源、目的节点之间的最短通路问题.仿真结果表明:CIR算法有效地实现了IP和WDM两层资源的联合优化,提高了网络资源利用,降低了网络阻塞率. 相似文献
18.
This paper reports on a novel strategy and related algorithm for realizing dynamic routing and grooming into wavelengths of data flows (label switched paths, LSPs) in new generation optical networks based on generalized MPLS (GMPLS). The method allows arbitrary granularities of LSPs. The new generation network is modeled as a multi-layer network consisting of an IP/MPLS layer and an optical layer. In particular, the proposed solution adopts a dynamic routing algorithm based on the Dijkstra algorithm, that makes use of a weight system, integrated with a suitable method for grooming LSPs into wavelengths based on the packing criterion, thus harmonizing the features of MPLS packet flows whose bandwidth vary in a continuous range of values, with the optical world, where the wavelength bandwidth ranges according to discrete values. The weight system is based on the concepts of least resistance routing that allows to evenly distribute the traffic at the MPLS layer, while packing improves the use of optical resources by favoring more filled wavelengths with respect to the emptier ones. To assess the validity of the proposed solution a simulation model has been realized. The results obtained by simulation show that the packing criterion allows reducing the refused bandwidth from two down to about four times, for a network load of 70% and 55%, respectively, when compared with the alternative method named spreading. The dependence of the proposed solution on bandwidth granularity has been also investigated. Moreover, in order to demonstrate the superior performance of the proposed routing solution, a comparison between the proposed strategy with relevant solutions known in the literature, based on either a single or multi-layer approach, is also reported. In order to perform the comparison, all the reference routing solutions that have been considered adopt the packing method for LSP grooming into the lightpaths. The results show that our solution outperforms the others in terms of amount of traffic that can be on-line accommodated. For instance, assuming a blocking probability of 10–3, the proposed solution is able to further reduce the refused bandwidth of the best routing algorithm considered in the analysis by a factor of three times, thanks to the knowledge of optical resource availability. 相似文献
19.
Path recovery aims at helping network operators automatically detecting and recovering from faults before human being’s intervening, and therefore can before customers notice these faults. By applying some algorithm of recovery, service provider (SP) can enhance the speed of repair and save paying refunds against broken service level agreement (SLA). Fast restoration of traffic after a network failure is a crucial aspect of current and future IP and transport networks. Recently, there is a… 相似文献