Määritelmä
Alinkisaphysicallinefromanodetoanadjacentnodewithoutanyotherswitchingnodesinthemiddle.
Indatacommunication,thepathbetweentwocomputersisoftenformedbyaseriesofmanylinks.
Sävellys
Alinkiscomposedofnodesatbothendsandcommunicationlinesbetweenthenodes.
Ero
Theconceptoflink(physicallink)isdifferentfromthatofdatalink.Inadditiontophysicallines,datalinksmustalsohaveacommunicationprotocoltocontrolthetransmissionofthesedata.Itisthedatalinkthataddsthehardwareandsoftwarethatimplementtheseprotocolstothelink.Datalinkisalsocalledlogicallink.
Luokittelu
Accordingtotheconnectionmethodofthecommunicationlink,thecommunicationlinkcanbedividedintothefollowingtwocategories:
Point-to-point-yhteysviestintäLink,linkki tällä kertaa yhdistää vainkaksi solmua.
Multipointconnectionlinkreferstohowmany(n>2)nodesareconnectedbyonelink.
Accordingtodifferentcommunicationmethods,linkscanbedividedintothefollowingtwocategories:
Yksisuuntainen viestintälinkki
p>
Kaksisuuntainen viestintälinkki
Accordingtothedifferentcapacity,thelinkisdividedintothefollowingtwocategories:
Viestintälinkki ilman kapasiteettia
Tiedonsiirtoyhteys kapasiteetin kanssa
Ethernetlinkin yhdistäminen
LinkaggregationistheaggregationofmultiplephysicalEthernetportstogethertoformalogicalaggregationgroup.Theupperlayerentitythatusesthelinkaggregationservicecombinesmultiplephysicallinksinthesameaggregationgroup.Thinkofitasalogicallink.
Linkaggregationcanrealizetheloadsharingofinbound/outboundloadamongthememberportsintheaggregationgrouptoincreasebandwidth.Atthesametime,eachmemberportofthesameaggregationgroupdynamicallybacksupeachother,whichimprovesconnectionreliability.
Device AandDevice BareconnectedthroughthreephysicalEthernetlinks,andthesethreelinksarebundledtogethertobecomealogicallinkLink aggregation 1,thebandwidthofthislogicallinkItisequaltothesumofthebandwidthoftheoriginalthreeEthernetphysicallinks,thusachievingthepurposeofincreasingthelinkbandwidth;atthesametime,thesethreeEthernetphysicallinksbackupeachother,whicheffectivelyimprovesthereliabilityofthelink.