Zte ZXR10 T600

Chapter3IPv6NeighborDiscoveryProtocolConguration
mustsendtheadvertisementimmediatelyratherthanwaitfor
thenextscheduledtransmissiontime.
�NeighborAdvertisement
Anodemustsendtheneighboradvertisementpacketuponre-
ceivingtherequestoftheneighborsolicitationpacketorupon
anychangeofitslink-layeraddress.
�NeighborSolicitation
Anodesendstheneighborsolicitationpackettorequestthe
neighbor'slink-layeraddresstoauthenticatetheaccessibility
oftheneighbor'slink-layeraddressobtainedandsavedinthe
cache,orauthenticatethatitsaddressisuniqueonthelocal
link.
�Redirection
Aroutersendsaredirectionpackettonotifyahostthatitis
nottheoptimumrouterforaspecicdestination.
Theroutersendstherouteradvertisementpacketthroughmulti-
cast,sothatthenodesonthesamelinkcanconstructtheirown
availabledefaultrouterlist.
Neighbordiscoverycanalsobeusedtorealizeothertargets,in-
cluding:
�Link-layerAddressChange
Anodemayhavemultipleinterfacesforthesamenetwork.If
thenodeknowsthatitslink-layeraddressischanged,itcan
sendsomemulticastgroupstonotifyothernodesofitsaddress
change.
�EntryLoadBalancing
Anodereceivingalargenumberofserviceowsmayhave
multiplenetworkinterfaces,whichcanberepresentedbyan
IPaddressifneighbordiscoveryisemployed.Therouterload
balancingcanberealizedbymakingtherouteromitthesource
link-layeraddressduringitssendingoftherouteradvertise-
mentpacket.
Everytimewhenanodethatsearchesthisrouterwantstosend
packetstothisrouter ,itmustexecutetheneighbordiscovery.
Then,theroutercanselectthelink-layerinterfacethatreceives
thepacketstorespondtothisnode.
�AnycastAddress
Asmentionedabove,ananycastaddressisasetoftheunicast
addresses.Thepacketsenttoananycastaddresswillbede-
liveredtoanyoneofitsunicastaddresses.Ananycastaddress
isusedtoidentifyasetofnodesprovidingthesameservice,
thatis,sendapackettoanynodeofananycastaddresswith-
outcaringwhichoneamongthenode-setwillrespond.
Duetomultiplemembersofananycastaddressmayrespond
totherequestfortheirrespectivelink-layeraddress,theneigh-
bordiscoverymechanismrequiresthatanodemustbeableto
predictthepossiblemultipleresponsestobereceivedandhan-
dlethemproperly.
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