简介：MPLS(Multi-ProtocolLabelSwitching)VPN(VirtualPrivateNetwork)traffichasbeendeployedwidely,butcurrentlyonlysupportsunicast.ThispaperbrieflyintroducesseveralavailableMPLSVPNmulticastapproaches,andthenanalyzestheirdisadvantages.Anovelmechanismthatusestwo-layerlabelstacktosupportMPLSVPNexplicitmulticastisproposedandtheprocessisdiscussedindetail.Thescalabilityandperformanceoftheproposedmechanismarestudiedanalytically.Theresultshowsthatoursolutionhasgreatadvantageoverthecurrentlyavailableschemeintermsofsavingcorenetworkbandwidthandimprovingthescalability.

简介：Averyinexpensiverecive-onlysatellitereceiverhighbandwidthtrafficfromafeeder.Thereforetheconnectionbetweenthefeederandthereceiverisuni-directional.Theexistingroutingprotocols,suchasLink-StateandDistance-Vector,aredesignedonthepremisethatanylinksarebidirectionalandtheycannothandletheuni-directionallinks.Inthispaper,adynamicmulticastroutingprotocolisproposed,whichcanhandleuni-directionalnetworks,Thisprotocolcanalsoadapttothedynamicchangeofthetopolgoyofthenetworkandhasgoodscalability.AformaldescriptionoftheprotocolbyPetrinetisgiven.Liveness,deadlockfreeandotherpropertiesoftheprotocolarepreoved.

简介：Inthispaper,basedonant-algorithm,weproposeaQoSmulticastroutingschemeinInternet.Wefirstdescribeant-algorithmmodelandgiveant-networkmodel,thenpresentanapproachusingant-algorithmtooptimizethemulticastrouteswithQoSconstaints.Finally,simulationshasbeenmadetoshowtheefficiencyoftheapproachintheenvironmentofOPNETsimulationsoftware,andthesimulationresultsshowthattheproposedapproachcanfindthebestoptimalmulticastrouteswhichcansatisfythedelay-boundedrequirementandavoidcongestednodesassoonaspossible.

简介：在里面无线多点传送，网络编码最近作为实质的改进吸引了注意到包重发计划。然而，发现最小化重发的最佳的网络代码的问题是难的解决或接近。这份报纸论述二个计划减少重发的数字为可靠高效地多点传送。一个人是用网络基于改进Vandermonde矩阵(VRNC)编码的重发，其它是用网络基于适应改进Vandermonde矩阵(AVRNC)编码的重发。用VRNC计划，发送者都选择包接收装置与改进Vandermonde失去了并且编码他们矩阵；当接收装置收到足够编码的重发包时，所有失去的包能被恢复。与AVRNC计划，发送者能在每重发包，然后改进Vandermonde矩阵发送以后从所有接收装置获得恢复信息能被更新，因此减少编码并且译码的复杂性。我们的建议计划能完成假定重发包的理论更低的界限无损失，并且就重发包损失而言接近理论更低的界限。模拟结果证明建议算法能高效地减少重发的数字，因此改善的传播效率。

简介：在大规模上在因特网上由于部署因特网协议(IP)的困难多点传送，覆盖多点传送被看作了一种有希望的选择在最近的年里开发multicast通讯。然而，存在覆盖多点传送解决方案受不了高费用在提交树的multicast维持节点的州的信息。一个无状态的覆盖多点传送计划被建议，在哪个multicast路由信息被一个花蕾过滤器(BF)编码并且没有对维持提交树的multicast的任何需要，包含了进包头。我们的计划利用节点异质，在物理拓扑学并且层次地的最近信息由把几何坐标分到所有覆盖节点构造运输树桩覆盖拓扑学。更重要地，计划使用BF技术识别提交树的multicast的节点和连接，它改进提交的效率并且减少假积极的提交环。分析并且模拟结果证明这个建议能完成高提交效率和好可伸缩性。

简介：摘要：本文在研究的过程中，根据实际的需求，对静态路由和动态路由协议进行了全面解析，其中包含的主要内容为，静态路由器是在配置固定的情况下生成的路由表，只有在工作人员干预的情况下才会发生变化，为了保证对静态路由和动态路由进行更加全面的了解，通过整理相关资料的情况下进行了具体的分析，希望可以为此方面的研究提供参考意见。

简介：ThewavelengthassignmentwithmultiplemulticastrequestsinfixedroutingWDMnetworkisstudied.Anewmulticastdynamicwavelengthassignmentalgorithmispresentedbasedonmatchingdegree.First,thewavelengthmatchingdegreebetweenavailablewavelengthsandmulticastroutingtreesisintroducedintothealgorithm.Then,thewavelengthassignmentistranslatedintothemaximumweightmatchinginbipartitegraph,andthismatchingproblemissolvedbyusinganextendedKuhn-Munkresalgorithm.Thesimulationresultsprovethattheoveralloptimalwavelengthassignmentschemeisobtainedinpolynomialtime.Atthesametime,theproposedalgorithmcanreducetheconnectingblockingprobabilityandimprovethesystemresourceutilization.

简介：本文主要介绍利用路由策略（RoutingPolicy）和路由泄露的相关特点，去定位日常网络运维中常见的路由不可达的故障，并提出排查方法，方便网络运维人员定位网络路由引入发布时的常见问题，提高了工作效率。

简介：Multicastcapability,includingmulticastaddressandmulticastroutingmechanisms,atthenetworklayerisnecessaryinordertoreducethebandwidthrequirementsofmultiparty,multicastapplications.Basedonhierarchicalautonomousstructureinaccordancewiththeself-organizationtopologiesofInternet,thepaperputsforwardamulticastaddressmanagementschemethatisshowntoberobustandscalable.Connectioncontrolhierarchy(CCH)basedonmaster/slaverelationshipandasimpleefficientbuildingalgorithmofmulti-pointconnectionisalsobuilt.Thepaperalsodescribesthenormaloperationsofmulticastaddressmanagementandmulti-pointconnectioncontroller.Throughsimulationexperiment,HAMCMandDDMofMulticastAddressAllocationarecompared.HAMintegratesthemeritsofCMandDDM,whichisefficientasawhole,robustandscalable.CCHraisestheefficiencyofconnectioncontrol,andishighlyrobust,flexibleandscalable.

简介：这篇文章在直角的频率部门multiplexing(OFDM)与min率要求限制处理multicast资源分配问题系统。由于为非线性、组合的优化的禁止地高的复杂性，原来的问题被放松并且形成一个标准优化问题的reformulated。根据Karush-Kuhn-Tucker(KKT)由理论推导调节，二项提议为optimality表现为必要标准。而且，包括副载波赋值和力量分配，一个二拍子的圆舞资源分配计划在实际实现的提议的一个基础上被建议。多点传送，min率基于组顺序，副载波以一种贪婪方式被分配最大化能力。当副载波赋值是坚定的时，建议力量分配能完成最佳的性能因为min率与可接受的复杂性抑制了能力最大化。模拟结果显示建议计划接近到彻底的搜索与可以忽略的能力差距获得的最佳的资源分配，并且更加超过相等的力量分发。同时，多点传送对在OFDM系统的资源利用显著地有益。

简介：这篇文章学习多限制最少费用多点传送在在稠密的波长部门multiplexing(IP/DWDM)上的因特网协议的路由问题联网。处理这个问题，individual-difference-based量基因算法(IDQGA)被建议。这个算法由介绍一个适应旋转角度步决心计划和基于组的量变化操作在染色体之中考虑单个差别。模拟在网络拓扑学上被进行。结果显示与另外的启发式的算法相比，IDQGA在解决服务(QoS)的质量上有更好最佳的性能多点传送在IP/DWDM网络的路由问题并且被强壮的坚韧性，高成功比率和优秀能力在全球寻找上描绘。

简介：Thedissertationstudiesthearchitectureofbroadbandintelligentnetwork(BIN)andimplementationofvideoconferencebasedonATMnetworkandofmulticastroutingproblemonvideoconferenceusingBINundertheaidoftheimportanttask-StudyofINandB-ISDNIntegration(69896244)-sponsoredbyNationalNaturalScienceFund.Alotofpointsofviewandsolutionsarepresent.Themaincontributionsinthedissertationareasfollows:(1)DesignthenewarchitectureofBINandimprovethearchitectureofBINproposedbyITU-T.ItiseasytosetuptheconnectionsofvideoconferenceusingthenewarchitectureofBIN.(2)PresentthedetailedschemethatBINcontrolsandimplementsvideoconferencewithoutspecializedresourcefunction,studytheschemeofallthemediaonvideoconferencetransmittedandswitchedunderthecontrolofBIN,anddiscusshowtoimplementpoint-to-multipointcommunicationsusingBIN.(3)FirstpresenttheschemeofimplementingmulticastroutingalgorithmsonvideoconferenceusingBIN.(4)Explicitlyintroduceaseriesofconceptsincludingneighboringnode,neighboringnodeset,neighboringedge,thenproposeanAdjustableDynamicMulticast(ADM)routingalgorithmwhichissuitableforvideoconference,analyzeitsperformances,andprovethealgorithmisappropriateandfeasible.(5)Developadegree-constraineddynamicmulticast(DADM)routingalgorithmwhichcanfindlesscostmulticastroutingtree.TheresultsofsimulationandexperimentsconfirmthatDADMalgorithmcanfindthelesscostmulticasttree.Finally,analyzetherelationbetweenthesizeofdegree-constrainedandvalueofmulticasttreecost.(6)Presentadelay-constraineddynamicmulticastroutingalgorithmsuitableforvideoconferencecharacteristic,andadviseaseriesofschemesreducingthedelayoftransmittingallthemediaonvideoconference.(7)FirstproposeimplementingthereliablemulticastroutingtransportprotocolusingBIN,therebyACKimplosionproblemcanbesolved.Theprotocolonlyrequiresfin

简介：Thestablemulticastflowaggregation(MFA)problemininternetprotocol(IP)overopticalnetworkunderthedynamicalscenarioisstudied.Givenanopticalnetworktopology,thereisasetofheadendsandaccessroutersattachedtotheopticalnetwork,inwhicheachheadendcanprovideasetofprograms(IPmulticastingflows)andeachaccessrouterrequestsasetofprograms,wefindasetofstablelight-treestoaccommodatetheoptimallyaggregatedmulticastIPflowsiftherequestsofaccessrouterschangeddynamically.Weintroduceaprogramcorrelationmatrixtodescribethepreferenceofendusers'requests.AstheoriginalMFAproblemisNP-complete,aheuristicapproach,namedmostcorrelatedprogramfirst(MCPF),ispresentedandcomparedwiththeextendedleasttreefirst(ELTF)algorithmwhichistopology-aware.SimulationresultsshowthatMCPFcanachievebetterperformancethanELTFintermsofstabilitywithnegligibleincrementofnetworkresourceusage.

简介：新multilayered内部卫星高度高度平台(幸运)系统路由算法被建议，它主要基于multipath路由保证网络reliability.The建议multipath路由计划主要依靠切开在不同路径之间的交通使多重routes.Linear编程的利用是的最好成为为multipathselection.The使用的主要方法主要限制到服务(QoS)的质量(延期和连接利用)被考虑了到我

简介：即R1认证了R2时（R2是被认证方）,R1认证了R2（R2是被认证方）不代表R2认证了R1（R1是被认证方）,R1上的明文认证配置如下

简介：在美丽的原始密林里，住着一个快乐的蓝精灵。每天清晨，当小鸟在枝头呜叫的时候，蓝精灵就醒了，于是他爬起身来拎着一个空桶去打水，然后捉着满满的一桶水回到家里。就这样，他每天从住的地方出发到河边打水，然后再沿原路返回。不过这个蓝精灵出发打水的行走路程和别人不一样，他只能南北向南，由西向东（即不能倒回走）去打水，如下图所示。

简介：我们知道,Internet是把全世界各地的各种网络--计算机网络、数据通信网络、以及公用电话交换网络等连接起来,组成一个跨越国界范围的庞大互联网.在庞大的Internet中,两台主机间实现通信已经不是点到点的通信所能解决的了,它涉及到Internet中的一些底层关键技术和机制,如路由技术就是其中之一.路由器是Internet实现互联的"标准部件".目前铁路互联网(cmet)所用的路由器是Cisco路由器.下面以Cisco网络为例,对IP路由技术作一简单介绍.

简介：

简介：AMinimizingIntermediateMulticastRoutingprotocol(MIMR)isproposedfordynamicmulti-hopadhocnetworks.InMIMR,multicastsessionsarecreatedandreleasedonlybysourcenodes.Ineachmulticastsessionprocess,thesourcenodekeepsalistofintermediatenodesanddestinations,whichisencapsulatedintothepacketheaderwhenthesourcenodesendsamulticastpacket.Nodesreceivingmulticastpacketsdecidetoacceptorforwardthepacketaccordingtothelist.Dependingontopologymatrixmaintainedbyunicastrouting,theshortestvirtualhierarchyroutingtreeiscon-structedbyimprovedDijkstraalgorithm.MIMRcanachievetheminimumnumberofintermediatenodes,whicharecomputedthroughthetree.Nocontrolpacketistransmittedintheprocessofmul-ticastsession.Loadofthenetworkislargelydecreased.ExperimentalresultshowsthatMIMRisflexibleandrobustfordynamicadhocnetworks.

简介：介绍了互联网的核心设备路由器的作用、基本原理及其作为网络连结设备的特点和分类，Win2000服务器路由功能的实现步骤．