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1、摘要VPN是一種依靠ISP和其他NSP在公用網(wǎng)絡(luò)中建立專用數(shù)據(jù)網(wǎng)絡(luò)的技術(shù)。在虛擬專用網(wǎng)中,任意的兩個(gè)節(jié)點(diǎn)之間的連接并沒有傳統(tǒng)專用網(wǎng)絡(luò)所需的端到端的物理鏈路,而是利用某種公眾網(wǎng)的資源動(dòng)態(tài)組成的,是通過(guò)特殊設(shè)計(jì)的硬件和軟件直接通過(guò)共享的IP網(wǎng)所建立的隧道來(lái)完成的。它利用了公共網(wǎng)絡(luò)做為企業(yè)骨干網(wǎng)有低成本的優(yōu)勢(shì),通過(guò)相應(yīng)的加密和認(rèn)證技術(shù)來(lái)保證用戶內(nèi)部網(wǎng)絡(luò)數(shù)據(jù)在公網(wǎng)上安全傳輸,克服了公共網(wǎng)絡(luò)缺乏保密性的弱點(diǎn),真正實(shí)現(xiàn)網(wǎng)絡(luò)數(shù)據(jù)的專有性和安全性。MPLS技術(shù)屬于第三代網(wǎng)絡(luò)架構(gòu)技術(shù),它把第2層交換技術(shù)跟第3層路由技術(shù)結(jié)合在一起,以便建立一個(gè)具有更好性能、更高穩(wěn)定性、靈活的和易于擴(kuò)展
2、的高速主干網(wǎng)絡(luò)。MPLS適合于動(dòng)態(tài)隧道技術(shù),而隧道技術(shù)是目前支持VPN業(yè)務(wù)的有效手段;同時(shí),MPLS技術(shù)通過(guò)標(biāo)記可以實(shí)現(xiàn)快速數(shù)據(jù)轉(zhuǎn)發(fā)和網(wǎng)絡(luò)質(zhì)量(QoS)控制,也為VPN網(wǎng)絡(luò)帶來(lái)與眾不同的好處。本文研究的基于MPLS技術(shù)的VPN網(wǎng)絡(luò)正是利用了MPLS的動(dòng)態(tài)隧道技術(shù)和網(wǎng)絡(luò)質(zhì)量控制技術(shù)來(lái)實(shí)現(xiàn)VPN網(wǎng)絡(luò),它結(jié)合了MPLS技術(shù)和VPN網(wǎng)絡(luò)兩方面的優(yōu)點(diǎn),克服了傳統(tǒng)技術(shù)構(gòu)建VPN網(wǎng)絡(luò)的缺點(diǎn),極大的提高了用戶網(wǎng)絡(luò)運(yùn)營(yíng)和管理的靈活性,同時(shí)又能滿足用戶對(duì)網(wǎng)絡(luò)傳輸?shù)陌踩?、?shí)時(shí)性、寬頻帶等高性能的需求。關(guān)鍵詞:MPLS技術(shù),VPN網(wǎng)絡(luò),MPLS技術(shù)的VPN網(wǎng)絡(luò)5ABSTRACTVPN,s
3、upportedbyISPandotherNSP,isonetechnologywhichestablishestheprivatedatanetworkinthepublicnetwork.ActuallyintheVirtualPrivateNetwork,itdoesnothavetheend-to-endphysicallinkbetweenthetworandomnodesthatthetraditionalprivatenetworkneed.Usually,itconsistsofsomedynamicresourcesfromthepublicnet
4、workslikeatunnelwhichisestablishedthroughthesharingIPnetworkandthespeciallydesignedhardwareaswellasthesoftware.Consideringthelowercost,ittakesthepublicnetworkasbackbonenetworkinenterprises.Throughthecorrespondingencryptionandauthenticationtechniquesitmakessurethatinternalnetworkusersca
5、ntransmitthedataonlinesafely.Atthesametime,VPNhasremovedtheweakpointaboutthesecurityinthepublicnetworkwhichalsoguaranteethedata’sproprietaryandsafety.TheMPLStechnologybelongstothirdgenerationnetworkconstructiontechnology.Itcombinesthe2ndexchangetechnologywiththe3rdroutetechnologysoasto
6、buildupahigh-speednetworkthathasabetterperformance,higherstability,moreflexibilityandeasierexpansibility.MPLSshouldbeusedinthedynamictunnelwhichisaeffectivewaytocarryouttheVPNserviceatpresent.Atthesametime,theMPLStechnologymayrealizethefastdatarepeaterandthequalityofservice(QoS)control
7、s,italsobringstheoutoftheordinaryadvantagefortheVPNnetwork.WhatthearticlemainlydiscussedisrightabouttheusingofMPLSdynamictunneltechnologyandtheserviceofqualitytorealizetheVPNnetworkbasedonMPLS.ItcombinestheadvantagesofbothMPLStechnologyandtheVPNnetwork,thenovercomestheshortcomingofth