Zte ZXR10 T600

Chapter2IPv6BasicConguration
IntheIPv6addressingsystemstructure,anyIPv6unicastad-
dressrequiresaninterfaceidentier .Aninterfaceidentier
isverysimilartothe48-bitMediaAccessControl(MAC)ad-
dress.TheMACaddressesareencodedthroughhardwareina
networkinterfacecard.Theyareburnedbythemanufacturer
intoanetworkinterfacecardandaregloballyunique.There
arenotwonetworkinterfacecardswithanidenticalMACad-
dress.Suchaddressescanbeusedtouniquelyidentifythe
interfacesatthenetworklink-layer .
TheinterfaceidentierofanIPv6hostaddressisbasedon
theIEEEEUI-64format,whichcreatesalocallyandglobally
unique64-bitinterfaceidentierbasedontheexistingMAC
addresses.TheappendixattachedtotheRFC2373describes
howtocreateinterfaceidentiers.
These64-bitinterfaceidentierscanaddressonebyoneglob-
allyandcanuniquelyidentifytheinterfaceofeachnetwork.
Thismeansthat,intheory,thereareupto264differentphysi-
calinterfacesandabout1.8x1019differentaddresses,which,
however ,onlyoccupyhalfoftheIPv6addressspace.Itis
enoughintheforeseeablefutureatleast.
TheIPv6unicastaddresscanbeclassiedintothefollowing
categories:
�AggregatableGlobalUnicastAddress
Thisisanotherkindofaggregation,whichisindependentof
InternetServiceProvider(ISP).Theprovider-basedaggre-
gatetiveaddressesmustbechangedasaproviderchanges,
whiletheexchange-basedaddressesaredirectlylocatedby
anIPv6switchingentity.Theexchangeprovidesaddress
blocks,andusersandprovidersconcludecontractsforthe
networkaccess.
Suchnetworkaccessiseitherdirectlyprovidedbya
provider ,orindirectlyprovidedbyanexchange.However ,
theroutingisthroughtheexchange.Inthisway,auser
needsnottoaddressagainwhenitchangesaprovider .At
thesametime,usersareallowedtousemultipleISPsto
processsingle-blocknetworkaddress.
Aggregatableglobalunicastaddressesincludeallthead-
dresseswhosethreestartingbitsare001,whichcanbe
usedasprexesforotherunallocatedunicast.Formatthe
addressesintotheeldsasshowninT able4
.
TABLE4AGGREGATABLEGLOBALUNICASTADDRESSFIELDS
3138241664
FPTLA
ID
RES
NLA
ID
SIA
ID
Interfaceidentier
Thetableincludesthefollowingelds.
–FPeld
Thisisthe3-bitformatprexinanIPv6address,in-
dicatingtowhichaddresscategoryintheIPv6address
spacethisaddressbelongs.Currently,theeldis001,
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