一个基于快速重路由机制的MPLS故障恢复模型

介绍了一些MPLS故障恢复模型及其存在的问胚，提出一个基于快速重路由机制的MPLS故障恢复模型，改进的快速重路由模型能有效地解决流量切换时的报文丢失及失序问题。     

基于MPLS的分级故障恢复机制

网络可靠性已经成为IP网的一个重要问题.目前关于IP网可靠性的讨论集中于MPLS的故障恢复机制.IETF提出了两种MPLS故障恢复模型保护交换和重路由,每种模型的恢复时间和资源开销是不同的.该文提出一种基于MPLS的分级故障恢复机制MBCR,它可以保证应用对可靠性和QoS的要求,同时使网络资源得到充分利用.     

MPLS故障恢复机制研究

综述了MPLS故障恢复机制的主要方式，给出了MPLS恢复、复原和动态重路由的流程图，介绍了形式化研究的模型和算法。     

基于基本回路的MPLS网络重路由故障恢复机制

研究MPLS网络中的重路由故障恢复机制,提出一种新的计算备用路径的方法,将备用路径的计算分为预处理和在线计算2个过程,给出一种基于基本回路的重路由故障恢复机制(FC-R)。仿真分析表明,FC-R恢复时间较短,可以对抗节点故障或链路故障,大大缩短在线计算时间,减轻节点负担,能够得到性能较优的备用路径,进一步节省网络资源。     

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。     

支持多故障恢复的MPLS快速重路由

分析了传统MPLS快速重路由应对多故障环境的不足,提出一种支持MPLS域并发多故障时快速恢复的重路由策略.通过有限洪泛故障信息,使本地修复的节点掌握有限范围内节点、链路的可用性信息,并通过建立主,从备份路径,保证MPLS层有效的恢复及较快的切换速度.理论分析及实验结果表明了该方法的可行性和有效性.     

基于MPLS流量工程的重路由算法研究

概述了MPLS的流量工程和故障恢复机制。在区分服务网络环境中,描述了一种基于集中模型的多故障的重路由算法。采用以优先级属性划分LSP的策略,将带宽作为主要需求参数,满足了不同LSP的QoS要求。其实现是基于MPLS流量工程的约束路由的最优化方程。模拟示例分析验证了算法的可行性和优越性。     

MPLS网络规划与快速重路由技术的应用

随着宽带业务的迅速发展,传统IP技术和路由协议已经不能满足用户对网络可靠性的需要。在IP城域网的MPLS域中,使用流量分担和网络备份、MPLS快速重路由方法,加快了网络故障恢复的时间,为用户提供了一个高可靠性的骨干网平台。     

支持自愈恢复的MPLS路由算法

对当前支持流量工程的路由算法进行了分析和比较,详尽地论述了MPLS自愈恢复机制,通过对最小干涉路由算法进行改进,设计了一种支持自愈恢复的MPLS路由算法,使得它能有效利用网络资源的同时支持故障恢复。     

基于Diffserv的MPLS多备份路径故障恢复模型

分析传统MPLS故障恢复机制的不足,提出一种新的MPLS故障恢复模型.该模型采用三种备份路径来减少丢包率.在传统MPLS故障恢复机制不考虑QoS的情况下,该模型将Diffserv、TE(Traffic Engineering)及MPLS三者相结合,来实现Diffserv网络中的QoS.仿真试验和结果分析证明了该模型的可行性和有效性.     

基于MPLS的移动IP微移动性研究

基于现有的将MPLS和微移动IP协议结合起来的研究成果,主要是HMPLS和MMPLS,分析它们存在的问题,提出了一种解决方案。该方案通过域内的LSP扩展,克服了现有MPLS和微移动IP结合方案的一些缺点,并同样支持快速切换和较低的信令开销,而且支持平滑切换。     

一种基于移动IPv6的RSVP性能研究

移动网络的性能是人们最为关心的问题之一。首先通过对移动IPv6与RSVP集成模型的工作过程的研究，深入分析了这种模型存在的问题。然后提出了在某些情况下可以采用的一种快速的串并行结合的消息分发方式，并对这种消息分发方式和逐跳方式进行比较，表明此种方式能更好的适应基于移动IPv6的移动MPLS网络。     

草酸钴合成过程批次间自适应优化

本文以钴湿法冶金过程草酸钴合成为背景,研究基于多向偏最小二乘回归(MPLS)模型的草酸钴平均粒度批次间自适应优化策略.本文首先利用MPLS方法建立草酸钴平均粒度的数据模型;针对模型不确定性情况下难以获得最优操作变量的问题,提出利用批次间修正项自适应优化方法,使迭代优化结果逐渐趋向于实际最优值;本文还通过引入T2统计量软约束将优化结果限制在数据模型的有效区间之内.数值仿真表明该方法可以有效解决草酸钴合成过程的批次间自适应优化问题,且与传统两步方法和迭代学习控制相比具有更好的优化效果.     

MPLS故障恢复中报文丢失及失序问题研究

介绍了几种主要的MPLS故障恢复模型,分析了各种模型使用过程中产生的报文丢失及失序问题.提出了一种基于Haskin故障恢复方法的故障恢复模型,并对该模型中流量重定向、流量切换以及流量汇聚的方法进行详细阐述.该模型能较好的解决由于流量切换而引起的报文丢失及失序问题.最后结论中指出了模型的不足,并提出了以后的研究方向.     

Dynamic Path Management with Resilience Constraints under Multiple Link Failures in MPLS/GMPLS Networks

Most previous research on MPLS/GMPLS recovery management has focused on efficient routing or signaling methods from single failures. However, multiple simultaneous failures may occur in large-scale complex virtual paths of MPLS/GMPLS networks. In this paper, we present a dynamic MPLS/GMPLS path management strategy in which the path recovery mechanism can rapidly find an optimal backup path which satisfies the resilience constraints under multiple link failure occurrences. We derived the conditions to test the existence of resilience-guaranteed backup path, and developed a decomposition theorem and backup path construction algorithm for the fast restoration of resilience-guaranteed backup paths, for the primary path with an arbitrary configuration. Finally, simulation results are presented to evaluate the performance of the proposed approach.     

MPLS VPN端到端QoS解决方案的应用研究

MPLS VPN是当今主流的虚拟专用网技术。在MPLS VPN中传输融合语音、视频和关键数据,其关键是要实现有效的QoS保证。在对DiffServ和MPLS TE进行研究的基础上,引入MPLS DS-TE。DS-TE结合DiffServ的区分服务和MPLS TE的端到端有效路由策略,运用带宽约束模型,在MPLS VPN中实现端到端区分服务的QoS保证。     

基于ATM的MPLS网络仿真模型设计与实现

利用计算机仿真分析MPLS网络的性能是深入研究MPLS技术的有效途径。该文通过分析基于ATM的MPLS技术，在借鉴OPNET仿真软件中MPLS模型的基础上，实现了基于ATM的标签交换路由器模型，构建了基于ATM的MPLS网络仿真模型。利用该仿真模型建立的MPLS仿真试验网络，数据传输性能明显优于非MPLS网络。该模型的开发对于MPLS网络的性能分析具有一定的意义。     

A survey of IP and multiprotocol label switching fast reroute schemes

One of the desirable features of any network is its ability to keep services running despite a link or node failure. This ability is usually referred to as network resilience and has become a key demand from service providers. Resilient networks recover from a failure by repairing themselves automatically by diverting traffic from the failed part of the network to another portion of the network. This traffic diversion process should be fast enough to ensure that the interruption of service due to a link or node failure is either unnoticeable or as small as possible. The new path taken by a diverted traffic can be computed at the time a failure occurs through a procedure called rerouting. Alternatively the path can be computed before a failure occurs through a procedure called fast reroute. Much attention is currently being paid to fast reroute because service providers who are used to the 50-ms failure recovery time associated with SONET networks are demanding the same feature from IP and MPLS networks. While this requirement can easily be met in SONET because it operates at the physical layer, it is not easily met in IP and MPLS networks that operate above the physical layer. However, over the last few years, several schemes have been proposed for accomplishing 50-ms fast reroutes for IP and MPLS networks. The purpose of this paper is to provide a survey of the IP fast reroute and MPLS fast reroute schemes that have been proposed.     

Packet loss probability for DiffServ over IP and MPLS reliable homogeneous multicast networks

Multicasting has become increasingly important with the emergence of Internet-based applications such as IP telephony, audio/video conferencing, distributed databases and software upgrading. IP multicasting is an efficient way to distribute information from a single source to multiple destinations at different locations. In practice IP is considered as a layer 3 protocol. Multiprotocol Label Switching (MPLS) replaces the IP forwarding by a simple label lookup. MPLS combines the flexibility of layer 3 routing and layer 2 switching.In order to provide QoS in group communications for real time applications such as video conferencing, reliable multicasting is used. Miscellaneous efforts have been undertaken to provide reliability on top of IP multicast. Two error control strategies have been popular in practice. These are the FEC (Forward Error Correction) strategy, which uses error correction alone, and the ARQ (Automatic Repeat Request) strategy, which uses error detection, combined with retransmission of data.In this paper, we present a new fair share policy (FSP) that utilizes Differentiated Services to solve the problems of QoS and congestion control when reliable ARQ multicast is used. The results should provide insight into the comparisons of the residual packet loss probability between IP multicast in MPLS networks using FSP and plain IP multicasting using the same policy when DiffServ are adopted and when reliable ARQ multicast is considered.     

一种多agent系统框架与协商机制研究*

从基于动态、异构网络上快速构建稳健的多agent系统出发,设计了多agent远程过程调用通信模型,定义了三种基本类型的agent,对KQML消息规范进行扩展,增加了对消息生存周期的控制,设计了双缓存消息推送器以实现agent消息的主动推送,并在WCF的基础上实现了该通信框架。针对同目标多agent协作系统提出了基于开销均衡的agent系统交互协商策略,通过实例证明相对于独立运行和基于正交互协商策略的agent系统,本协商策略可有效降低系统总开销,并可使运行负载更为均衡。