多协议标记交换

多协议标记交换(MPLS)将面向连接的机制加入到面向非连接IP协议中,既能保持IP协议的灵活性、可靠性和可扩展性,又能大大提高数据的转发速度和网络的吞吐量,还十分有利于QoS的实现,是一种非常有前景的网络技术。本文从MPLS中的基本概念出发,分析了其工作原理,并对标记的语义和粒度、聚合与合并、标记分发的驱动机制,以及标记信息库与相关标记操作等方面进行了探讨。     

一种基于公平性M PL S 的流控制技术研究

多媒体业务在Internet上的广泛应用带来了响应流和非响应流间带宽享用的公平性问题,严重影响网络的性能.提出一种基于公平的MPLS流控制机制,该机制通过在MPLS模型中添加特定的队列管理算法CSFQ,在一定程度上解决了MPLS域中流间的公平性问题,并且其对于MPLS设备的扩展完全可以通过软件的升级来实现,有较好的可行性.     

基于MPLS的VPN在光网中的实现

虚拟专用网(VirtualPrivateNetwork:VPN)是网络互联技术和通信需求迅猛发展的产物,而MPLS(Multi-ProtocolLabelSwitching:多协议标记交换)是打开进入新世纪VPN技术之门的“钥匙”。MPLS属于下一代网络(NGN)架构,是IP高速骨干网络交换标准,MPLS使服务供应商能够提供端到端的高度可扩展的、分级别的商业IP业务,而且服务供应商和用户的配置和管理更加简单。本文提出了一种新的把MLPSVPN应用在光网络中的方法。     

BGP/MPLS VPN实现原理

VPN技术致力于为地理上分布于各地的分支机构提供安全、可靠、易于管理的互联服务。该文描述了基于BGP/ MPLS 技术的VPN的应用领域和网络拓扑结构，论述了BGP/ MPLS VPN网络路由信息是如何产生的以及数据信息的传输过程。     

一种基于MPLS保证每流服务质量的方法

分析了当前网络中保证服务质量的机制，针对目前MPLS本身的服务质量只支持区分服务的现状，提出将动态分组状态模型用于MPLS的方法，通过将状态信息封装在MPLS分组的二层标签中，使核心网络在不需保存每流状态的情况下提供基于每流的服务质量，详细阐述了该方案的总体结构、数据平面和控制平面等，并通过在ns中模拟分析对该方案进行了验证。     

基于MPLS技术的VPN研究

MPLS（多协议标记交换）技术能够融合电信网和计算机网，有希望发展成为下一代网络，即宽带分组交换网的骨干网技术，所以采用MPLS技术在宽带网络中构建VPN（虚拟专用网）巳是一种必然趋势。对MPLS作为VPN的逆道技术进行了研究，阐述了在MPLS网络上构建VPN的优势和存在的不足，并对MPLS网络上构建VPN的发展前景进行了分析。     

以太网下MPLS数据流监测平台的研究

MPLS(MultiProtocolLabelSwitching)即多协议标记交换,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独特的数据报文格式以及特殊的应用,传统的信息监测系统无法对以太网中以MPLS为载体的应用实施有效的监测。以太网下MPLS数据流监测平台就在这种情况下应运而生。本文的核心就是以太网下MPLS数据流监测平台的研究。     

基于MPLS的IP语音网络恢复性能仿真分析*

提出了一种基于MPLS 的IP语音网络恢复性能评估方案,该方案利用OPNET Modeler工具构建一个基于MPLS的IP语音网络仿真平台,分析与评估基于MPLS的两种故障恢复技术。仿真结果表明,采用基于MPLS OAM技术的快速重路由算法可以有效地缩短流量重路由时间与改进IP语音网络服务质量,验证了基于MPLS OAM技术的FRR算法在VoIP网络系统中实现QoS性能网络优化的可行性。     

支持区分服务的MPLS网络

多协议标记交换（MPLS：Multi-protocol Label Switching)技术为IP网络中实现服务质量（QoS),路由控制等提供了可行的解决方案。简单介绍了区分服务（Diff-Serv)和MPLS的基本技术框架,重在说明如何在MPLS网络中实现区分服务,通过两种标记交换通道分别对不同情况下的分组进行转发,利用MPLS头标中的标记和EXP域实现多等级的区分服务。     

IP网络QoS体系性能的研究

MPLS流量工程通过优化IP网络资源的使用以提高网络性能,同时结合约束路由和面向连接的标记交换路径提供了端到端的QoS保障。在网络上层,DiffServ和MPLS相结合,DiffServ将业务分类、整形、聚合,MPLS再将处理过的数据转换成不同的标签进行转发。在网络底层,MPLS与WDM光网络技术相结合,从而实现更快、更智能的数据传送。     

对等模型下MPLmS控制平面研究

光互联网是一种简洁，高效、经济的网络体系结构。光网络的发展需要一个统一的控制面，来完成智能化的资源发现、状态信息散播、通道选择和通道管理。论述了网络模型和统一控制面的需求，指出了重叠模型流量工程的弊端，认为在光互联网中应采取对等模型的流量工程，提出了在对等模型中运用MPLmS（多协议标记波长交换）技术，建立一个MPLmS模型的统一控制面并对控制面中的几个功能模块及结构进行分析。     

The IETF Multiprotocol Label Switching Standard: The MPLS Transport Profile Case

Multiprocol Label Switching (MPLS) is a technology for traffic engineering for and the optimization of IP networks. It's also an enabling technology for building applications on top of IP networks. The IETF has standardized the MPLS protocol suite, as well as technologies — such as virtual private networks and pseudowires — that build on it. MPLS is a mature technology and is used extensively by all the major network operators. The IETF has also standardized a technology — Generalized MPLS — that extends the MPLS control plane for use with other data plane technologies.     

汇聚组播:新型MPLS服务质量组播体系结构

为支持新兴网络应用,IP组播(multicast)和MPLS(multi-protocol label switching)技术分别从不同方向扩展了当前的IP路由和交换模式.MPLS和IP组播的结合是当前研究的一个热点,MPLS网络中的服务质量组播面临着标签资源匮乏、组播路由状态的可扩展性以及具体实现上的困难.针对这些问题,提出了基于汇聚方法的新型MPLS服务质量组播体系结构,提出在现有的路由控制平面上叠加一层面向IP组播服务的控制平面,取代组播路由协议并支持组播聚集,形成2层控制平面结构.定义了两平面之间的协作和交互方式,并通过扩展RSVP-TE(resource reservation protocol-traffic engineering) P2MP(point to multi-point)协议,在新的体系结构中融合了服务质量控制能力.另外,还探讨了汇聚组播中基于距离约束选择汇聚路由器的算法,实现了基于Linux的MPLS组播路由器和IP组播服务控制系统,并组建了实验平台.实验和模拟结果表明,基于汇聚组播的双平面网络控制结构能够适应组播用户和网络拓扑的动态变化,能够有效节省MPLS标签资源,平衡网络中组播流量的分布.     

Providing service differentiation in pure IP-based networks

The lack of an effective cooperation between the data, control and management plane of QoS routing solutions presented so far, prevents the implementation of service differentiation in the context of pure IP-based networks. Most of paths calculation proposals performed by the control plane are unaware of service characteristics of each flow. Scalable data plane QoS proposals ignore the issue about selecting the best paths to route the traffic. Proposed management plane schemes do not perform the network state maintenance and service level monitoring. Multi-service routing is a flow-based forwarding protocol that implements the service differentiation in pure IP-based networks, using a straight cooperation between data, control and management plane. This cooperation is accomplished by a data plane supporting the DiffServ model and performs route selection based on flows service class, which is exploited by the management plane to carry out the network state maintenance, and performance monitoring by using the RTCP protocol, to provide service metrics to control plane for route calculation. Simulation experiments show better performance results achieved by Multi-service routing compared to those obtained by traditional link state protocol with the DiffServ model and QoS routing in heavy loaded network scenarios of mixed traffic having different service requirements.     

软件定义网络数据平面安全综述

软件定义网络将数据平面与控制平面解耦,旨在更快地引入网络创新,并从根本上实现大型网络的自动化管理。架构创新带来了挑战与机遇,安全问题限制了软件定义网络的广泛采用。针对数据平面的攻击可能会损毁整个软件定义网络,首先介绍了数据平面结构与发展趋势;然后分析了数据平面安全风险,指出漏洞,确定潜在的攻击场景,并给出2种具体解决方案,讨论其意义与局限性;最后展望未来的安全研究方向。     

Mobility label based network: Mobility support in label switched networks with multi-protocol BGP

To support mobility the network control plane is required to detect changes in the mobile node’s location and distribute the new location information throughout the network thus enabling the forwarding plane to deliver traffic in an optimal manner. The network responsiveness to the mobile node movements can be generally thought of as the time elapsed between the moment the node’s location in the network has changed and the moment the reception of packets in the new location has resumed. This paper outlines an approach to handling the user mobility at the network layer in the context of multi-protocol label switched networks (MPLS). This new approach does not rely on the existing IP mobility management protocols such as Mobile IP and is instead based on the combination of multi-protocol BGP (MP-BGP) and MPLS. This paper proposes to introduce new protocol elements to MP-BGP to achieve mobility label distribution at the network control plane and the optimal packet delivery to the mobile node by the network forwarding plane using MPLS regardless of the IP protocol addressing and the associated logical network topology.     

GMPLS技术研究

GMPLS是MPLS的扩展，旨在解决多种组网技术的流量工程问题。为了探讨当前应用GMPLS时存在的问题及其解决方案，分析了GMPLS架构及研究现状，通过对MPLS协议应用于光纤网时存在的问题的分析，得出了GMPLS协议MPLS协议的改进点。指出了GMPLS中亟待解决的问题并提出了自己的见解。     

MPLS技术及其发展趋势

多协议标签交换使用定长的标签来引导数据高速传输和交换。MPLS,实现了增强的流量工程和负载均衡,为服务供应商和企业改善整体网络管理、更好地利用可用带宽提供了技术支持。MPLS技术为传输网和光网络、支持移动IP、以及在无线移动通信网的发展中提供了重要解决方案     

Mobility label based network: Hierarchical mobility management and packet forwarding architecture

Scalability of the network layer mobility management solution is one of the most important requirements for the mobility control plane. Mobility Label Based Network (MLBN) is a new approach to the network layer mobility management problem that relies solely on MPLS to provide both macro- and micro-mobility for IPv4 and IPv6 mobile hosts and routers. This new approach does not rely on the existing IP mobility management protocols such as Mobile IP and is based on the combination of Multi-Protocol BGP (MP-BGP) and MPLS. In the context of the MLBN the scalable control plane should be capable of efficient Mobility Label distribution while allowing the MPLS-based forwarding plane to deliver mobile traffic in an optimal manner. This paper presents a hierarchical mobility management system capable of both macro- and micro-mobility support without the use of Mobile IP and its derivatives and allows scalable Mobility Label distribution and MPLS label stack based packet forwarding in support of optimal traffic delivery between the communicating mobile users.     

Beyond MPLS ... Less is More

Multiprotocol label switching possesses a simple data plane that has enabled new services and functions operating in many service provider networks. Yet, the MPLS control plane can impose both technical and operational challenges. This article explores these challenges and examines recent advances in IP routing technology suggesting that all services - including those that are MPLS-based - can be delivered over networks running only IP.