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1、RFC2236(RFC2236)InternetRFC/STD/FYI/BCPArchives[RFCIndex
2、RFCSearch
3、UsenetFAQs
4、WebFAQs
5、Documents
6、Cities]AlternateFormats:rfc2236.txt
7、rfc2236.txt.pdfCommentonRFC2236RFC2236-InternetGroupManagementProtocol,Version2NetworkWorkingGroupW.FennerRequestforCo
8、mments:2236XeroxPARCUpdates:1112November1997Category:StandardsTrackInternetGroupManagementProtocol,Version2StatusofthisMemoThisdocumentspecifiesanInternetstandardstrackprotocolfortheInternetcommunity,andrequestsdiscussionandsuggestionsforimprovements
9、.Pleaserefertothecurrenteditionofthe"InternetOfficialProtocolStandards"(STD1)forthestandardizationstateandstatusofthisprotocol.Distributionofthismemoisunlimited.CopyrightNoticeCopyright(C)TheInternetSociety(1997).AllRightsReserved.AbstractThismemodoc
10、umentsIGMPv2,usedbyIPhoststoreporttheirmulticastgroupmembershipstorouters.ItupdatesSTD5,RFC1112.IGMPv2allowsgroupmembershipterminationtobequicklyreportedtotheroutingprotocol,whichisimportantforhigh-bandwidthmulticastgroupsand/orsubnetswithhighlyvolat
11、ilegroupmembership.ThisdocumentisaproductoftheInter-DomainMulticastRoutingworkinggroupwithintheInternetEngineeringTaskForce.Commentsaresolicitedandshouldbeaddressedtotheworkinggroup'smailinglistatidmr@cs.ucl.ac.ukand/ortheauthor(s).1.DefinitionsTheke
12、ywords"MUST","MUSTNOT","REQUIRED","SHALL","SHALLNOT","SHOULD","SHOULDNOT","RECOMMENDED","MAY",and"OPTIONAL"inthisdocumentaretobeinterpretedasdescribedinRFC2119[RFC2119].2.IntroductionTheInternetGroupManagementProtocol(IGMP)isusedbyIPhoststoreportthei
13、rmulticastgroupmembershipstoanyimmediately-neighboringmulticastrouters.ThismemodescribesonlytheuseofIGMPbetweenhostsandrouterstodeterminegroupmembership.Routersthataremembersofmulticastgroupsareexpectedtobehaveashostsaswellasrouters,andmayevenrespond
14、totheirownqueries.IGMPmayalsobeusedbetweenrouters,butsuchuseisnotspecifiedhere.LikeICMP,IGMPisaintegralpartofIP.ItisrequiredtobeimplementedbyallhostswishingtoreceiveIPmulticasts.IGMPmessagesareencapsulatedinIPdatagrams,withanIPprotocolnumberof2.AllIG