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1、IPv6AgendaIPngProtocols&StandardsIPv6Integration&Co-ExistenceCiscoIOSIPv6roadmapIPv6DeploymentIPv6–SoWhat’sReallyChanged?VersionIHLTypeofServiceTotalLengthIdentificationFlagsFragmentOffsetTimetoLiveProtocolHeaderChecksumSourceAddressDestinationAddressOptionsPaddingVersionTrafficClassFlowLab

2、elPayloadLengthNextHeaderHopLimitSourceAddressDestinationAddressDefinedbyRFC2460Addresslengthquadrupledto16bytesFixedlength(Optionalheadersdaisychained)Nochecksumming(DonebyLinkLayer)Nohop-by-hopsegmentation(PathMTUdiscovery)Flowlabel/class(IntegratedQoSsupport)Concatenatedextensionheaders…

3、IPv4HeaderIPv6HeaderIPv6MainFeatures/FunctionalityExpandedAddressSpaceHeaderFormatSimplificationAuto-configurationandMulti-HomingMobileIPwithouttriangularroutingClassofService/MultimediasupportAuthenticationandPrivacyCapabilitiesNomorebroadcastMulticastIPv4IPv6TransitionStrategyIPv6Addressi

4、ngIPv6AddressingrulesarecoveredbymultiplesRFC’sArchitecturedefinedbyRFC2373AddressTypesare:Unicast:OnetoOne(Global,Linklocal,Sitelocal,Compatible)Anycast:OnetoNearest(AllocatedfromUnicast)Multicast:OnetoManyReservedAsingleinterfacemaybeassignedmultipleIPv6addressesofanytype(unicast,anycast,

5、multicast)NoBroadcastAddress->UseMulticastIPv6AddressingPrefixFormat(PF)AllocationPF=00000000:ReservedPF=0000001:ReservedforOSINSAPAllocation(seeRFC1888)PF=0000010:WasreservedforIPXAllocation(nouse)PF=001:AggregatableGlobalUnicastAddressPF=1111111010:LinkLocalUseAddressesPF=1111111011:SiteL

6、ocalUseAddressesPF=11111111:MulticastAddressesOthervaluesarecurrentlyUnassigned(approx.7/8thoftotal)AllPrefixFormatshavetohaveEUI-64bitsInterfaceIDButMulticastTextRepresentationofIPv6Addresses“preferred”form:1080:0:FF:0:8:800:200C:417Acompressedform:FF01:0:0:0:0:0:0:43becomesFF01::43IPv4-co

7、mpatible:0:0:0:0:0:0:13.1.68.3or::13.1.68.3RFC2732:PreferredformatforliteralIPv6addressinURLGlobalUnicastAddresses(RFC2374)AggregatableGlobalUnicastFormat-RFC2374AddresshierarchymatchesInternetServiceProviderhierarchyTerminology:FP-FormatPrefix:Unicast(0