Content and context aware networking using semantic tagging(6)

Today’s model of networking primarily concentrates intelligence at the end hosts with the network itself offering a simple“best-effort”,“data agnostic ” communication medium. However, this paradigm has proven to be insufficient to meet todays needs co

thatarepermissible,thecrosslayerinteractionsarekepttractablewithoutmakingtheimplementationoverlyconvo-luted[21].

Alayer2LSP.

ADiffServawarenetwork. AnIntServawarenetwork.

ACoCoNetRouterFrameworkwillperformthenecessarymappingbasedonpolicy,contentandcontext.Forinstance,supposeapacketarrivesatarouterindicatingthatitre-quiresreliabletransfersemantics.Thedataplanechosentothenexthop,inthiscase,couldbeoveraTCPconnec-tion.Likewise,adatapacketindicatingthatitissensitiveinformation(telnetloginsforexample)butcurrentlynoten-cryptedcanberoutedtothenexthopoveranIPSECtun-nelordroppedifnoneisavailable(ifthatisthepolicy).WhereaCoCoNetRouterFrameworkrunsisveryimple-mentationdependent.Forexample,incaseofawirelessadhocnetwork,everyhostisarouterandhencecanpoten-tiallyruna(albeitsimpli ed)CoCoNetRouterFramework.Likewise,inanenterprisesetting,thehostmachineswithintheenterprisewilllikelyrunonlytheCoconetNodeFrame-workwithonlytheexteriorgatewayroutersrunningtheCo-conetRouterFramework.AnetworkserviceproviderwillmostlikelyhaveonlyedgeroutersruntheCoconetRouterFrameworkleavingthecoreoptimizedforfastdata owhandling.TheroleoftheGlobalPolicyDistributionPoint(GPDP)istodisseminateanynetworkwidepoliciesthatneedtobeenforced.Thiscanincludeitemssuchaspref-erentialtreatmentthatneedstobegiventocontentorigi-natingfromaparticulardomain,preferentialtreatmentforaparticulartypeofcontent,anycontentbasedadaptationtechniquesthatneedtobeemployedinthenetworketc.ItisenvisionedthattheGPDPiscontrolledbytheISPtosetforthglobalruleswhiletheLPDPhostedatanenterpriselocationispossiblysharedbetweentheISPandtheenter-prise.ThiscanfurtherbeextendedtosaythattheLDPDisunderlocalusercontrol(basedonuserpoliciesandpref-erences)andcanadditionally,hostuserpreferences.Inor-dertopropagatecontentlevelinformationforpacketsand ows,weproposetotakeoneofthefollowingapproaches. ThemetadatacanbedirectlyencodedintotheIPop-tions eldofanIPpacket(sizeisanissue).Werefertothisas“in-bandtagging”.

IPpacketsusetheIPoptions eldtocarryaspecial32bitidenti er.Thisidenti erisusedtoindicateawellknown(global)e-fulfornon- owbasedone-timepacketssuchastelnetloginorHTTPURLrequest.Werefertothisas“out-of-bandtagging”.

IPpacketsusetheIPoptions eldtocarryaspecialkey.Thiskeyislookedupinadirectoryservicetoidentifythemetadatadescribingthatpacketor ow.Thisisalso“out-of-bandtagging”.Usingastructured6

3.2Network

Level

Figure2.OverlayNetwork

Atthenetworklevel,weenvisionthattherewillbeanoverlaynetworkcomprisedofroutersthatruntheCoCoNetRouterFramework.ClientmachinesrunningourNodeFrameworkcommunicateoverthisoverlay.Theoverlaycomprisesoftwocomponents;

AcontrolplanecomponentthatinvolvesinteractionsbetweentheCoCoNetRouterLayersattheroutingel-ements.

Adataplanecomponentthroughwhichthedatapack-etsare owing.

OvertheCoCoNetRoutercontrolplane,routerscanex-changetraditionalmanagementinformationsuchaslinkstates,bufferlengthsetc.Inaddition,informationsuchascontenttypescurrentlybeinghandled,adaptationscurrentlyavailablecanbeadvertised.Anadditionalkeypieceofin-formationexchangedisthelocalpoliciesthatarecurrentlybeingappliedtoadatastreamthatisbeingrouted.LocalPEPsettingsforagivenstreamor owhaveglobalimpli-cations.Forexample,unlesseveryhopisreliable,adatapacketcannotbereliablyroutedthroughanetwork.Thedataplanecanbeimplementedaseither: AUDPconnectionbetweentworouters. ATCPconnectionbetweentworouters. AnIP-in-IPtunnelbetweentworouters.

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