DynamicStatelessGRETunnel动态无国籍GRE隧道

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1、DynamicStatelessGRETunnelLiXueDayongGuo1ProblemStatementDHCPServerCPENPEGRETunnelProviderGRETunnelInternet•InMSOormobilehotspotscenario,theGREtunnelsbetweenCPEsandtheNPEareestablishedtocarryuserdata.•Auto-configurationanddynamicmanagementarerequiredforlargenumbers

2、ofCPEstodiscovertheaddressofNPEandforNPEtoconfigureGREtunnel.•DHCP(v6)optionisextendedtosupportNPEdiscovery2DynamicGRETunnellNPEdiscoveryonCPEpTosetupaGREtunnel,aCPEsendaDHCPRequesttogettheNPEaddressandothertunnelparameterssuchasGREKey,Version,ProtocolTypepTheDHCP

3、GREDiscovery(GD)Optionisdefinedinthefollowingpage.lEstablishmentPhasepForCPE,theGREtunnelissetupafterreceivingDHCPGDOption.pWhenNPEreceivesthepacketwithGREencapsulationwithanewclientaddress,theNPEcanrecordstheassignedUE'saddress,whichistheinneraddressofGREencapsul

4、atedpacket.lKeepalivePhasepIfthereisnodatapacketforaperiodoftime,theNPEwillteardownthetunnelandreleasetheresource.3ProcedureCMSGIPv4-x.x.x.xCMTSIPv4-y.y.y.y(CPE)(DHCPServer)(NPE)DHCPv4RequestPreliminaryPhase(Discovery)DHCPv4Replywithy.y.y.yEstablishmentEncap/Decap

5、.UserPacketinGREEncapEncap/DecapPhaseTunnelClientListConfig.KeepaliveKeepalivePacketinGREEncapPhaseDynamicStatelessGRETunnelinMSOWLANNetwork4DHCPv4GREDiscoveryOption•Code:TBD•Ver:TheversionnumberofGREprotocol,containedinGERheader.•Reserved:Thisfieldisreservedforfu

6、tureuse.•ProtocolType:TheProtocolTypeFieldcontainstheprotocoltypeofthepayloadpacket.•NPEAddress:NPEIPv4Address,theendpointofGREtunnel.5DHCPv6GREDiscoveryOption•Code:TBD•Ver:TheversionnumbercontainedinGERheader.•Reserved:Thisfieldisreservedforfutureuse.•ProtocolTyp

7、e:TheProtocolTypeFieldcontainstheprotocoltypeofthepayloadpacket.•NPEAddress:NPEIPv6Address,theendpointofGREtunnel.6GREKey•DHCPv4GREKeySub-Option(Optional)–Code:TBD•DHCPv6GREKeyOption(Optional)–Code:TBD–Optionally,DHCPv6GREKeyOptionisencapsulatedinDHCPv6GREDiscover

8、yOptionGREKey:GREKeyisgeneratedfromRFC2890.IftheclientreceivestheGREKeySub-Option,theKeyMUSTbeinsertedintotheGREencapsulationheader7Thanks8