Zte ZXR10 ZSR V2 - Chapter 17 6 RD Configuration

Chapter17
6RDConguration
TableofContents
6RDOverview..........................................................................................................17-1
Conguring6RDTunnels.........................................................................................17-5
6RDCongurationExample.....................................................................................17-6
17.16RDOverview
Introduction
6rdspeciesaprotocolmechanismtodeployIPv6tositesthroughaserviceprovider’s
(SP’s)IPv4network.Itbuildson6to4,withthekeydifferentiatorthatitutilizesanSP’sown
IPv6addressprexratherthanawell-knownprex(2002::/16).ByusingtheSP’sIPv6
prex,theoperationaldomainof6rdislimitedtotheSPnetwork,andisunderitsdirect
control.FromtheperspectiveofcustomersitesandtheIPv6Internetatlarge,theIPv6
serviceprovidedisequivalenttonativeIPv6.
The6rdmechanismreliesuponanalgorithmicmappingbetweentheIPv6andIPv4
addressesthatareassignedforusewithintheSPnetwork.Thismappingallowsfor
automaticdeterminationofIPv4tunnelendpointsfromIPv6prexes,allowingstateless
operationof6rd.
A6rddomainconsistsof6rdCustomerEdge(CE)routersandoneormore6rdBorder
Relays(BRs).IPv6packetsencapsulatedby6rdfollowtheIPv4routingtopologywithin
theSPnetworkamongCEsandBRs.6rdBRsaretraversedonlyforIPv6packetsthat
aredestinedtoorarearrivingfromoutsidetheSP’s6rddomain.As6rdisstateless,BRs
maybereachedusinganycastforfailoverandresiliency.
6rdutilizesthesameencapsulationandbasemechanismas6to4,andcouldbeviewedas
asupersetof6to4(6to4couldbeachievedbysettingthe6rdprexto2002::/16).Unlike
6to4,6rdisforuseonlyinanenvironmentwhereaserviceprovidercloselymanagesthe
deliveryofIPv6service.6to4routeswiththe2002::/16prexmayexistalongside6rdin
the6rdCErouter,anddoingsomayoffersomeefciencieswhencommunicatingdirectly
with6to4routers.
6rdPrexDelegation
Figure17-1showstheformatofanIPv6addresswitha6rdprexandanembeddedCE
IPv4address.
17-1
SJ-20140504150128-018|2014-05-10(R1.0)ZTEProprietaryandCondential