Lenovo Flex System Fabric CN4093 User Manual

168 CN4093 Application Guide for N/OS 8.4
ToavoidtheActorswitchports(withthesameadminkey)fromaggregatingin
anotherLAG,youcanconfigureaLAGID.Portswiththesameadminkey
(althoughwithdifferentLAGIDs)competetogetaggregatedinaLAG.TheLAG
IDfortheLAGisdecidedbasedonthe
firstportthat isaggregatedintheLAG.
PortswiththisLAGIDgetaggregatedandtheotherportsareplacedin
suspendedmode.AspertheconfigurationshowninTable 16,ifport38gets
aggregatedfirst,thentheLAGIDofport38wouldbetheLAGIDof
theLAG.Port
40wouldbeplacedinsuspendedmode.Wheninsuspendedmode,aport
transmitsonlyLACPdataunits(LACPDUs)anddiscardsallothertraffic.
Aportmayalsobeplacedinsuspendedmodeforthefollowingreasons:
 WhenLACPisconfiguredontheportbutitstopsreceivingLACPDUsfromthe
partnerswitch.
 WhentheporthasadifferentLAGIDbecauseofthepartnerswitchMACbeing
different.Forexample:whenaswitchisconnectedtotwopartners.
LAGIDcanbeconfiguredusingthefollowingcommand:
LACPprovidesforthecontrolledadditionandremovalofphysicallinksforthe
linkaggregation.
LACP Modes
EachportintheCN4093canhaveoneofthefollowingLACPmodes.
 off(default)
TheusercanconfigurethisportintoaregularstaticLAG.
 active
TheportiscapableofformingaLACPLAG.ThisportsendsLACPDUpackets
topartnersystemports.
 passive
TheportiscapableofformingaLACPLAG.Thisportonlyrespondstothe
LACPDUpacketssentfromaLACPactiveport.
EachactiveLACPporttransmitsLACPdataunits(LACPDUs),whileeachpassive
LACPportlistensforLACPDUs.DuringLACPnegotiation,theadminkeyis
exchanged.TheLACPLAG
isenabledaslongastheinformationmatchesatboth
endsofthelink.Iftheadminkeyvaluechangesforaportateitherendofthelink,
thatport’sassociationwiththeLACPLAGislost.
IfaLACPLAGmemberportisconnectedtoaportthatis
inLACPoffmode,the
LACPportwillnotbeabletoconvergeandthe linkgoesdown.
Whenthesystemisinitialized,allportsarebydefaultinLACPoffmodeand are
assigneduniqueadminkeys.Tomakeagroupofportscapableofbeingaggregated,
youassign
themallthesameadmin key.Youmustsettheport’sLACPmodeto
activetoactivateLACPnegotiation.Youcansetotherport’sLACPmodeto
passive,toreducetheamountofLACPDUtrafficattheinitialLAG‐formingstage.
CN 4093(config)# portchannel <65‐128> lacp key <adminkeyoftheLAG>

Lenovo Flex System Fabric CN4093 Specifications

General

Brand	Lenovo
Model	Flex System Fabric CN4093
Category	Switch
Language	English