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1、RFCRFC22362236(RFC2236)(RFC2236)InterRFCSTDFYIBCPArchives[RFCIndex|RFCSearch|UseFAQs|WebFAQs|Documents|Cities]AlternateAlternateFmats:Fmats:rfc2236.txt|rfc2236.txt.pdfCommentonRFC2236RFCRFC22362236InterInterGroupGroupMan

2、agementManagementProtocolProtocolVersionVersion2wkWkingGroupW.FennerRequestfComments:2236XeroxPARCUpdates:1112November1997Categy:StardsTrackInterGroupManagementProtocolVersion2StatusofthisMemoThisdocumentspecifiesanInter

3、stardstrackprotocolftheIntercommunityrequestsdiscussionsuggestionsfimprovements.Pleaserefertothecurrenteditionofthe“InterOfficialProtocolStards“(STD1)fthestardizationstatestatusofthisprotocol.Distributionofthismemoisunli

4、mited.CopyrightNoticeCopyright(C)TheInterSociety(1997).AllRightsReserved.AbstractThismemodocumentsIGMPv2usedbyIPhoststorepttheirmulticastgroupmembershipstorouters.ItupdatesSTD5RFC1112.IGMPv2allowsgroupmembershipterminati

5、ontobequicklyreptedtotheroutingprotocolwhichisimptantfhighbwidthmulticastgroupssubswithhighlyvolatilegroupmembership.ThisdocumentisaproductoftheInterDomainMulticastRoutingTherearetwosubtypesofMembershipQuerymessages:Gene

6、ralQueryusedtolearnwhichgroupshavemembersonanattachedwk.GroupSpecificQueryusedtolearnifaparticulargrouphasanymembersonanattachedwk.ThesetwomessagesaredifferentiatedbytheGroupAddressasdescribedinsection1.4.MembershipQuery

7、messagesarereferredtosimplyas“Query“messages.0x16=Version2MembershipRept0x17=LeaveGroupThereisanadditionaltypeofmessagefbackwardscompatibilitywithIGMPv1:0x12=Version1MembershipReptThisdocumentreferstoMembershipReptssimpl

8、yas“Repts“.Whennoversionisspecifiedthestatementappliesequallytobothversions.Unrecognizedmessagetypesshouldbesilentlyigned.NewmessagetypesmaybeusedbynewerversionsofIGMPbymulticastroutingprotocolsotheruses.2.2.MaxResponseT

9、imeTheMaxResponseTimefieldismeaningfulonlyinMembershipQuerymessagesspecifiesthemaximumallowedtimebefesendingarespondingreptinunitsof110second.Inallothermessagesitissettozerobythesenderignedbyreceivers.Varyingthissettinga

10、llowsIGMPv2routerstotunethe“l(fā)eavelatency“(thetimebetweenthemomentthelasthostleavesagroupwhentheroutingprotocolisnotifiedthattherearenomemembers)asdiscussedinsection7.8.ItalsoallowstuningoftheburstinessofIGMPtrafficonasub

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