internet engineering task force k. k. ramakrishnan internet draft teraoptic networks

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1、InternetEngineeringTaskForceK.K.RamakrishnanINTERNETDRAFTTeraOpticNetworksdraft-ietf-tsvwg-ecn-00.txtSallyFloydACIRID.BlackEMCNovember,2000Expires:May,2001TheAdditionofExplicitCongestionNotification(ECN)toIPStatusofthisMemoThisdocumentisanInternet-DraftandisinfullconformancewithallprovisionsofS

2、ection10ofRFC2026.Internet-DraftsareworkingdocumentsoftheInternetEngineeringTaskForce(IETF),itsareas,anditsworkinggroups.NotethatothergroupsmayalsodistributeworkingdocumentsasInternet-Drafts.Internet-Draftsaredraftdocumentsvalidforamaximumofsixmonthsandmaybeupdated,replaced,orobsoletedbyotherdo

3、cumentsatanytime.ItisinappropriatetouseInternet-Draftsasreferencematerialortocitethemotherthanas"workinprogress."ThelistofcurrentInternet-Draftscanbeaccessedathttp://www.ietf.org/ietf/1id-abstracts.txtThelistofInternet-DraftShadowDirectoriescanbeaccessedathttp://www.ietf.org/shadow.html.Abstrac

4、tThisdocumentspecifiestheincorporationofECN(ExplicitCongestionNotification)toTCPandIP,includingECN'suseoftwobitsintheIPheader'sDSfield.WebeginbydescribingTCP'suseofpacketdropsasanindicationofcongestion.Nextweexplainthatwiththeadditionofactivequeuemanagement(e.g.,RED)totheInternetinfrastructure,

5、whereroutersdetectcongestionbeforethequeueoverflows,routersarenolongerlimitedtopacketdropsasanindicationofcongestion.RouterscaninsteadsettheCongestionExperienced(CE)bitintheIPheaderofpacketsfromECN-capabletransports.WedescribewhentheCEbitistobesetinrouters,andRamakrishnanandFloydProposedStandar

6、d[Page1]draft-ietf-tsvwg-ecn-00AdditionofECNtoIPNovember2000describemodificationsneededtoTCPtomakeitECN-capable.Modificationstoothertransportprotocols(e.g.,unreliableunicastormulticast,reliablemulticast,otherreliableunicasttransportprotocols)couldbeconsideredasthoseprotocolsaredevelopedandadvan

7、cethroughthestandardsprocess.WealsodescribeinthisdocumenttheissuesinvolvingtheuseofECNwithinIPtunnels,andwithinIPsectunnelsinparticular.Oneoftheguidingprinciplesforthisdocumentisthatallthemechanismsspecifiedhereareincrementallydep