MPLS技术在帧中继网络中的应用

多协议标签交换MPLS体系结构中允许使用帧中继交换机作为标签交换路由器LSR。本文将就FR-LSR中的标签封装、标签交换的处理与环路防止措施等进行研究。     

多协议标签交换MPLS

从２０世纪９０年代中期开始,因特网迅速发展,业务种类日益增多,特别是宽带业务,使数据通信业务量猛增。近年来已经达到了每９个月就要翻一番的程度,发展和速度已远远超过了电话业务的增长速度,使电信网也将向多业务数据网络的方向发展。业务的发展对网络的性能提出了高要求。现有的网络如何向未来的网络发展？ 因特网原本是计算机通信网,是按照数据通信的特点设计的,对数据传输的可靠性要求严格,而对时延、抖动等服务质量则没有要求,是靠无连接网络"尽力而为"的方式来满足要求的。而现在因特网业务中包括了ＩＰ电话、电视会议、…     

MPLS的技术发展及对网络运营商的影响

叙述了MPLS的一些关键技术的进展情况及存在问题，同时表明了MPLS技术对网络运营商影响的一些看法，并建议了MPLS技术的一些使用范围。     

改善基于ATM实现的MPLS网络扩展性

本从标签的需求量和网络的尺寸两个方面入手，介绍了基于ATM交换硬件实现MPLS网络的扩展性问题，并针对某些极端情况进行了定量的分析，最后又进一步给出了改善扩展性的几种方式，如虚标签空间、VP合并、VC合并等。     

MPLS宽带网络技术讲座 第1讲 MPLS网络体系结构

多协议标签交换（MPLS）是当前宽带通信领域的热点技术之一,它将第二层的交换和第三层的路由技术完美地结合起来。本文结合MPLS的几项核心技术,如标签,标签交换路由器,标签分发协议,标签交换路径等,对MPLS的体系结构进行分析和研究,同时结合这些核心技术进一步阐述了MPLS技术的特点。     

MPLS技术的现状及发展

采用带有MPLS功能的IP路由器和带有MPLS功能的ATM交换机组建未来宽带综合业务通信网，是业界迫切需要解决的问题。本介绍MPLS的基本原理与网络优点、技术现状、未来发展趋势，提出中国发展MPLS应考虑的问题。     

基于MPLS技术的波长交换包网络设计

本文在分析了三种优选的未来IP网络解决方案的基础上,提出了一种全新的高速宽带IP网络技术方案－基于光MPLS技术的波长交换分组（包）网络,并对其进行了较深入的研究。     

MPLS技术优势及宽带网络的发展趋势

分析了数据通信领域MPLS技术的优势，结合光网络和无线数据网络的发展，探讨了下一代宽带网络技术的发展趋势，对我国宽带网络技术的发展提出了几点建议。     

改善基于ATM实现的MPLS网络扩展性

本文从标签的需求量和网络的尺寸两个方面入手,介绍了基于ATM交换硬件实现MPLS网络的扩展性问题,并针对某些极端情况进行了定量的分析,最后又进一步给出了改善扩展性的几种方式,如虚标签空间、VP合并、VC合并等。     

大规模多业务网络中几个关键问题的分析

随着网络规模的不断扩大和业务的不断涌现，一些在网络建设初期没有予以足够重视的问题已日益变得突出。文章针对其中几个关键问题进行了分析，并提出了解决思路。     

MPLS技术发展及应用

随着网络设施的持续发展,网络规模越来越大,需要交换的数据量也与日俱增,因此一个高速传输和交换的网络技术就显得尤为重要.作为下一代网络的关键技术,多协议标签交换(MPLS)技术在改善和提高网络性能方面扮演着越来越重要的角色.因此,网络界很大一部分重点已经转向采用多协议标记交换.这为简化虚拟专用网(VPN)链路,实现服务融合和流量工程提供了极具吸引力的机会,同时最大限度地降低了与早期方法有关的复杂度和开销.重点介绍了多协议标签交换技术的发展方向和一些主要应用.     

一种MPLS网络间的IP业务传送技术

当前跨多协议标记交换(MPLS)网络进行网间IP业务传送具有一定的局限性。详细描述了MPLS网络间辅以网关设备的IP业务传送技术,并提出接入网关和互连网关的设计方案,重点阐述了网关的模块组成和接口设计;结合在研的2种典型MPLS网络,利用AX4000测试仪对跨网的端到端IP业务传送性能进行分析,针对业务优先级和利用通道保护能力的IP业务传送指标进行测试,对测试数据和应用效果进行分析总结。     

Quality-of-Service Based Protection in MPLS Control WDM Mesh Networks

Intelligent methods for automatic protection and restoration are critical in optical transport mesh networks. This paper discusses the problem of quality-of-service (QoS)-based protection in terms of the protection-switching time and availability for end-to-end lightpaths in a WDM mesh network. We analyze the backup lightpath-sharing problem in such networks and study the correlation of the working lightpaths and the impact of the correlation on the sharing of the backup lightpaths. We present a multi-protocol-label-switching (MPLS) control-based fully distributed algorithm to solve the protection problem. The proposed algorithm includes intelligent and automatic procedures to set up, take down, activate, restore, and manage backup lightpaths. It greatly reduces the required resources for protection by allowing the sharing of network resources by multiple backup lightpaths. At the same time, it guarantees, if possible, to satisfy the availability requirement even with resource sharing by taking the correlation of working lightpaths into consideration. A simple analysis of the proposed algorithm in terms of computation time and message complexity indicates that the implementation of the algorithm is practical. The illustrative studies that compare the performance of 1:1, unlimited sharing, and QoS-based backup sharing algorithms indicate that QoS-based sharing achieves comparable performance as unlimited sharing, which is much better than the 1:1 backup scheme in terms of connection blocking probability, average number of connections in the network for a given offered load, and network resource utilization.     

MPLS Recovery Mechanisms for IP-over-WDM Networks

Due to the fast increase of Internet traffic and the enormous bandwidth potential of all-optical transport networks based on wavelength division multiplexing, an IP-over-WDM network scenario is likely to be widespread in future communication networks. At the same time, IP networks are becoming more and more mission-critical. Hence, it is of paramount importance for IP-over-WDM networks to be able to recover quickly from frequently occurring network failures. This paper explains how multi-protocol label switching (both electrical and optical) recovery mechanisms can be important to reach that goal. Moreover, a novel MPLS recovery mechanism called fast topology-driven constrained-based rerouting is presented. Different MPLS recovery mechanisms are compared to each other. Special attention hereby goes to the additional capacity that is required to recover from frequently occurring failures.     

Overview on MPLS Virtual Private Networks

The basic idea, features, and necessity of multiprotocol label switching (MPLS) are given in this paper, with a special focus on virtual private networks (VPN) as one of the most important features that MPLS as technology enables and supports. In this context, we first describe the general VPN models, the overlay and the peer model, and than analyze different models, such as the BGP/MPLS virtual private networks and the layer-2 MPLS virtual private networks. All over the paper, the benefits provided by using MPLS for different VPN models are emphasized, with particular attention to improved scalability, management, and quality of service (QoS).     

基于MPLS的光突发交换技术

介绍了这种网络的结构以及特点,重点讨论了目前国内外在LOBS研究中的最新进展,以及MPLS的扩展(GMPLS)对传统OBS的支持和改进。     

A Preemption-Aware On-line Routing Algorithm for MPLS Networks

In the context of Multiprotocol Label Switching (MPLS), we look at the problem of organizing the mapping of Label Switched Paths (LSPs) in an optimal way throughout the network on the basis of a given objective function. This problem is highly combinatorial and makes dynamic and real-time features a difficult issue for any LSP routing scheme. For this reason, we propose a computationally efficient, though approximate, on-line scheme adapted to an incremental optimization of the network state. We also propose an integration of a computationally efficient preemption mechanism into this approximation. The efficiency of this algorithm is obtained through a very rigid but seemingly appropriate policy concerning which LSPs are appropriate for preemption. A feedback from preemption on the routing process is proposed, in order to regulate the rate of the reroutings and to tune the balance between stability and continuous reorganization in a network.     

基于优先级的MPLS重路由转发机制

分析了MPLS流量工程中重路由技术和保护切换恢复模型,结合IPv6特性,提出了基于优先级的重路由转发机制——优先级MPLS机制(P-MPLS).该机制为数据流设置不同的优先级,当工作路径发生故障时,将高优先级的数据流优先切换到保护路径上,从而使高优先级的数据流得到QoS保证.实验表明,P-MPLS降低了延迟和丢包率,提高了吞吐量.     

MPLS网络的OAM功能研究与实现

首先结合MPLS的协议参考模型阐述了操作与维护(OAM)在MPLS网络中的地位、作用;其次,结合协议Y.1710和Y.1711,对OAM的数据格式和OAM的机制进行了介绍;最后对综合业务交换机中OAM软件的实现模型、内部外部接口进行了说明,并对OAM软件的4个主要模块:维护控制模块、连通性管理模块、故障管理模块和性能管理模块的功能实现进行了详细地说明。