基于MPLS的MSTP技术实现分析

多业务传输平台(MSTP)设备是新一代SDH设备,它不仅提供传统的时分复用(TDM)通道,还支持以太网等数据业务的接入和传送,能满足城域网边缘和各种专用网的多业务接入需求。MSTP实现以太网接入有多种技术选择,也有不同的实现方案,基于多协议标记交换(MPLS)技术实现MSTP,结合IP技术及光网络的特点,是先进及可行的方案。文章介绍了MSTP和MPLS的技术特点,从基本原理、网络结构、实现方式分析了基于MPLS实现MSTP的技术。分析表明:基于MPLS的MSTP网络具有QoS的保证,是实现下一代光网络的重要方式。     

信息

新品方案Agilent N2X全面验证IPTV的业务运营安捷伦科技公司日前证实,其N2X多业务测试解决方案对在目前规模最大的多层G M P L S/M P L S测试网络上提供IPTV业务的性能进行了全面验证。在十几家M P L S和G M P L S厂商的协助下,Agilent N2X对在MPLS和MPLS/GMPLS互通上运营IPTV业务进行了功能和性能验证。Agilent N2X是业内惟一具有以下能力的一体化多端口解决方案:能够仿真光控制面板以建立GMPLS网络;验证支持MPLS的服务,例如组播VPN、VPLS和IPTV。N2X的IPTV频道切换应用与MPLS测试能力相结合,可对在两种…     

MPLS VPN差别化服务的实现技术模型及应用

为了满足互联网接入业务的服务质量需求,改变缺乏区分服务BGP/MPLS VPN网络的Qos的现状,提出了MPLS VPN网络的差别化服务应用模型,引入区分服务感知的流量工程(DS-TE)应用模型,通过MPLS Differ Serv模型在PE端的应用和DS-TE模型实现最小带宽的保证,从而实现高优先级业务服务质量的同时实现了优化网络资源的目的。     

一种基于MPLS的无线接入网微移动方案

将MPLS技术应用到基于IP的无线接入网络是近年越来越受到关注的新课题.本文提出了一种基于MPLS的微移动方案,方案采用在基站进行缓冲的方法降低切换时的分组丢失.最后对方案的性能从算法所产生的网络开销、切换时延与分组丢失几个方面进行了分析和讨论,结果表明本方案适用于高速微蜂窝及微微蜂窝的移动通信环境,并能满足一般的数据及实时业务的需求.     

基于MPLS VPN的IP管理网络部署研究

为实现IP管理网络的业务分类及接入安全性,文章基于MPLS VPN,综合考虑业务接入对防火墙的要求,设计了网络核心层、汇聚层、接入层的安全管理网络架构。首先介绍了MPLSVPN实现原理,在此基础上,分别从链路连接、设备选择、路由配置等方面研究了MPLS VPN网络部署方案。这一方案有利于网络业务划分与运营维护,同时集成化的防火墙规划也有利于保障网络安全。     

IP RAN技术在本地网中的应用

一、IPRAN的概念IPRAN即无线接入网IP化。它基于灵活IP通信的设计理念,以传统的路由器架构为基础,针对移动基站回传应用场景而定制的路由器／交换机解决方案,主要用于基站（BTS）与基站控制器（BSC／RNC）之间传送网络。二、IPRAN技术在本地网中的具体应用1．IPRAN网络架构IPRAN网络一般采用核心层、汇聚层、接入层三层结构,在BSC／RNC所在的核心节点部署两端核心设备,作为主备用。核心层、汇聚层采用IP／MPLS技术,采用支持IP／MPLS的路由器。接入层采用增强以太技术或与IP／MPLS相结合的方案,基站接入节点采用路由器或三层交换机。     

基于MPLS技术的3G无线接入网络

介绍了第三代移动通信系统(3G)的无线接入网络的体系结构以及所采用的传输网技术。在此基础之上,重点分析了基于MPLS技术的3G无线接入网络方案,并对基于不同传输网方案的3GRAN中的实时业务时延性能进行了仿真比较。分析和仿真结果表明,基于MPLS技术的3C无线接入网络不仅可以提供多种类型业务的区分服务,而且也改善了实时业务的时延性能。     

缔造电信级IP城域网中兴MPLS路由交换机

MPLS已成为构建电信级IP网络中最关键的技术之一,但如何有效部署MPLS网络、实施全程全网的MPLS业务、并实现用户便捷的MPLS业务接入,是业界关注的应用课题,本文就MPLS路由交换机的业务功能以及在电信级IP城域网的优化中的典型应用作一综述.     

天博光电专栏利用AToM-MPLS任意传输技术提供二层传输服务

1背景 MPLS(Multi-Protocol Label Switching)多协议标记交换技术,属于第三代网络架构,是新一代的IP高速骨干网络交换标准.由于MPLS在VPN接入服务、流量工程及CoS/QoS等方面具有非常良好的性能,因此众多的广电系统运营商在进入电信服务领域时都采用了IP/MPLS技术构建自己的骨干网.     

基于MPLS VPN的电信级多业务IP承载网设计研究

IP承载网已作为电信全业务的承载方式在电信系统得到广泛应用。MPLS VPN作为构建IP承载网的关键技术,能够有效实现不同业务隔离及采用不同接入方式用户的无障碍通信。文章基于电信运营商角度,给出了基于MPLS VPN的电信级IP承载网网络架构方案,并对其多业务组网应用方式作出研究和探讨。     

A distributed LSP scheme to reduce spare bandwidth demand in MPLS networks

A preplanned path-protection scheme with sufficient spare bandwidth is appropriate for real-time fault restoration in multiprotocol label switching (MPLS) networks. In this case, however, it is important to reduce the amount of spare bandwidth to prevent degradation of network efficiency. A distributed label switched path (D-LSP) scheme is proposed to reduce the amount of spare bandwidth required for protecting against network faults in MPLS networks. The main idea of the proposed D-LSP scheme is to partition traffic into multiple LSPs, each of which is established on a distinct link-disjoint route between each pair of end nodes. The D-LSP scheme is evaluated in terms of the reduction ratio of total network cost in comparison with the conventional LSP scheme. Traffic partitioning in the D-LSP scheme can decrease the statistical multiplexing gain (SMG) obtained by aggregating IP packet flows into an LSP. The tradeoff between spare bandwidth reduction and degradation of SMG due to traffic partitioning is also investigated. The numerical results show that the proposed D-LSP scheme yields the network cost-reduction ratio (NCRR) of at least 29%, 27%, and 15% for the networks where average node degrees are 4.6, 4.4, and 3.2, respectively. The D-LSP scheme shows the similar performance of NCRR in both Markovian traffic and self-similar traffic environments.     

Demonstration of the highly reliable Hikari router network based on a newly developed disjoint path selection scheme

Integration of multiprotocol label switching functions and multiprotocol lambda switching functions can enhance the throughput of IP networks and remove bottlenecks that are derived from electrical packet processing. To enhance the packet forwarding capability, NTT proposed a photonic MPLS concept that includes MP/spl lambda/S, and demonstrated IP, MPLS, and photonic MPLS integrated router systems called the photonic MPLS router. This router system is now called the Hikari router. The word Hikari is Japanese meaning beam, light, lightwave, optical, photonic, and sunshine. The amount of IP data traffic has grown remarkably. Massive IP routers and flexible route control mechanisms are now required to cope with the increased amount of traffic. The Hikari router can offer two solutions utilizing photonic switching technologies, and photonic network operation and management technologies. The first solution is utilizing photonic switching technologies realized using optical-switch-based crossconnect systems. The other solution is realized using the MPLS and MP/spl lambda/S signaling protocol and photonic network protection functions. In this article we report on the implementation of the Hikari router systems, propose a newly developed disjoint path selection scheme for generalized MPLS networks with shared risk link group constraints, and demonstrate the signaling protocol and network protection functions. The demonstration system achieves a distributed optical path set-up/tear-down protocol with an extended constraint-based routing label distribution protocol. Fast self-healing through automatic protection switching and a new restoration scheme are also implemented. These functions are successfully implemented, and the performance is verified on a demonstration network. The protection switching scheme achieves protection in less than 20 ms, and the optical path restoration scheme achieves restoration in less than 500 ms.     

Performance Comparison and Analysis of IP and MPLS Networks

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MPLS流量工程中的约束路由技术

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.     

基于LDP的MPLS网络流量统计功能的研究

随着MPLS(Multi-Protocol Label Switch)技术的逐步成熟,其承载的业务越来越丰富,网络流量成为描述网络行为的重要指标之一.主要介绍了分布式设备中基于LDP(Label Distribute Protocol)的MPLS网络流量统计功能的实现,详细阐述了系统模块的交互关系、处理流程以及主要的函数接口与数据结构,最后对该功能进行组网测试.测试结果证明了LSP(Label Switch Path)流量统计功能的有效性,能很好地满足用户、运营商的业务需求.     

Edge distributed admission control in MPLS networks

This paper proposes a novel approach for admission control in traffic engineered data networks, which applies at network edges by means of dynamic thresholds evaluated on the basis of network status. The proposed method is described with focus on IP/MPLS networks, but it actually applies as well to a variety of scenarios, such as ATM or generalized MPLS. The proposed solution allows more efficient usage of network resources, especially at medium/high load, and increased robustness of the network.     

在基于MPLS的层次化移动IP网络中支持DiffServ的研究

MPLS支持DiffServ、流量工程,能为网络提供较好的QoS保证,而移动IP(MIP)能为移动设备提供较好的移动性支持。文章探讨了在无线接入网中MPLS和MIP结合实现DiffServ的方案,并给出了一种在基于MPLS的层次化MIP网络结构中支持DiffServ的体系结构,设计了其节点功能模型和关键协议。方案中利用了层次化结构的区域注册和重路由机制,减少了切换时延和网络的信令负荷。     

Protection approaches for dynamic traffic in IP/MPLS-over-WDM networks

Due to the explosive growth of data-related traffic driven by the Internet, network reliability becomes an important issue. We investigate various protection approaches to handle failures for dynamic traffic demands in IP/MPLS-over-WDM networks. An LSP can be protected at either the IP/MPLS layer or the optical layer. In IP/MPLS layer protection, an LSP is protected by providing a link-disjoint backup LSP between its end nodes. In optical layer protection, an LSP is protected by the backup lightpath of each lightpath traversed by the LSP. We present two integrated routing algorithms: hop-based integrated routing algorithm and bandwidth-based integrated routing algorithm (BIRA) to set up the restorable bandwidth-guaranteed paths efficiently. Then we present a multilayer protection scheme for multiclass traffic in such networks. This scheme takes into account the different QoS and recovery requirements of the traffic to provide protection capability either at the MPLS layer or at the optical layer in a cost-effective manner. We use the connection blocking probability and number of optical-electrical-optical conversions as performance metrics to compare various protection approaches.     

A scalable QoS routing model for diffserv over MPLS networks

In this paper, we present a new Quality of Service (QoS) routing model for Differentiated Services (Diffserv) over Multiprotocol Label Switching (MPLS) networks. We use a pre-established multi-path model in which several MPLS label switching paths (LSPs) are established between each ingress-egress router pair in advance. Ingress routers perform per-request admission control and bulk-type resource reservation based on the resource availability on the associated LSPs. We use a utilization-based dynamic load balancing scheme to increase resource utilization across LSPs. The proposed model increases signaling and state scalability in the network core. It also provides hard QoS guarantees and minimizes admission control time. The experimental results verify the achievements of our model under various network topologies and traffic conditions.     

MPLS中一种具有二级缓存结构的VC合并方案

指出了MPLS中简单VC合并方案的不足，据此提出了一种符合MPLS要求的具有二级缓存结构的VC合并方案，称其为HBVC。HBVC可应用任何服务调度策略在LSP内的不同合并流之间提供基于分组的交换，并可在不同的LSP之间进行信元级的交换，因此将有利于QoS的实现。与另一种可应用于MPLS中的VC合并方案CRAM作了比较。分析表明HBVC在可扩展性、网络时延、系统最大吞吐率、对流量工程的支持、兼容性、系统实现复杂性等方面均优于CRAM。