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1、PERFORMANCEUNDERAFAILUREOFWIDE-AREADATAGRAMNETWORKSWITHUNICASTANDMULTICASTTRAFFICROUTINGSamirShah&DeepMedhiDepartmentofComputerNetworkingUniversityofMissouri±KansasCityKansasCity,MO64110,USAEmail:samir.shah@nist.gov,dmedhi@umkc.edunetworks,virtualcircuit-basedpacketnetworksincluding
2、ATM-ABSTRACTbasednetworks[2,3,8,11,12,19,21],therehasbeenveryAmajorlinkornodefailureinanetworkcanseverelyaffectlimitedworkinthisareaforIP-datagramnetworks.servicesofferedbythenetwork.Inthispaper,weaddressnet-Inthiswork,weconsidertheissueofnetworkperformanceworkperformance,especially,in
3、theeventofalinkfailureintheofawide-areadatagramnetwork,suchastheInternet,support-presenceofbothunicastandmulticastroutinginwide-areadata-ingmulticasttraf®calongwithunicasttraf®c,especiallywhengramnetworks,suchastheInternet.Sincevariousservicescansubjectedtoalinkfailure.Failureinthenetw
4、orkchangesthenet-exertdifferentworkloads(perconnection/session),wehavede-worktopologyandhencethepathsoverwhichpacketsarerouted.velopedworkloadstore¯ectbothone-to-manyandmany-to-manyRoutinginthenetworklayertakescareofroutingupdatesandmulticastcommunicationsontopofmulticastrouting.Throug
5、hactualroutingofpackets.Traditionalunicastapplicationssuchasnetworksimulation,wequantifyeffectsonhowunicastservicestelnet,ftp,email,etc.operateoverreliabletransportproto-andmulticastservicesareaffectedduetosuchafailure.colTCP;notethatTCPisdesignedtocompensateonlyforveryminimallossofpac
6、kets(lessthan1%,see[18]).Applications1.INTRODUCTIONwhichusethemulticastfacilitiesofthenetworkwouldtypicallyInrecentyears,theInternethasseensurgeinnewerservicesrunoverunreliabletransportprotocol(UDP)astheyareprimarilybesidesthepopularreliableunicastservicessuchastelnet,ftp,delaysensitiv
7、ethanlosssensitive(althoughexcessivelossisnotandemail.Ononehand,thereisincreaseinpopularityofwebdesirable)andthuswouldnotlikelytohaveacknowledgementsbrowsingamongreliableunicastservicesandtheabilitytoprovideandretransmissions.Inspiteofthis,wewouldliketominimizeInternetªvoicecall"forr
