Enterasys b5

Link Aggregation Control Protocol (LACP)
7-46 Port Configuration
protocol,nodynamiclinkaggregationswillbe formedandtheswitchwillfunctionnormally(that
is,willblockredundantpaths).Forinformationaboutbuildingstaticaggregations,refertoset
lacpstatic(page 7‐50).
EachEnterasysB5moduleprovidessixvirtuallinkaggregatorports,whicharedesignatedinthe
CLIas
lag.0.1throughlag.0.6.EachLAGcanhaveuptoeightassociatedphysicalports.Once
underlyingphysicalports(forexample,fe.x.x,or
ge.x.x)areassociatedwithanaggregatorport,
theresultingaggregation willberepresentedasoneLAGwithalag.0.xportdesignation.LACP
determineswhichunderlyingphysicalportsarecapableofag gregatingbycomparingoperational
keys.AggregatorportsallowonlyunderlyingportswithkeysmatchingtheirstojointheirLAG.
LACPuses
asystempriorityvaluetobuildaLAGID,whichdeterminesaggregationprecedence.
Iftherearetwopartnerdevicescompetingforthesameaggregator,LACPcomparestheLAGIDs
foreachgroupingofports.TheLAGwiththelowerLAGIDisgivenprecedenceandwillbe
allowedtouse
theaggregator.
Thereareafewcasesinwhichportswillnotaggregate:
•Anunderlyingphysicalportisattachedtoanotherportonthissameswitch(loopback).
•ThereisnoavailableaggregatorfortwoormoreportswiththesameLAGID.Thiscan
happeniftherearesimplynoavailableaggregators,
orifnoneoftheaggregatorshavea
matchingadminkeyandsystempriority.
• 802.1xauthenti cationisenabledusingtheseteapolcommand(page 16‐18)andportsthat
wouldotherwiseaggregatearenot802.1Xauthorized.
TheLACPimplementationontheEnterasysB5devicewillallowuptoeightphysicalports
intoa
LAG.ThedevicewiththelowestLAGIDdetermineswhichunderlyingphysicalportsareallowed
intoaLAGbasedontheports’LAGportpriority.PortswiththelowestLAGportpriorityvalues
areallowedintotheLAGandallotherspeedgroupingsgointoastandbystate.
Multi‐
portLAGswillcontinuetooperateaslongasthereisatleastoneactiveportintheLAG.
Therefore,thereisnoneedtocreatebackupsingleportLAGsortospecificallyassigntheLAGand 
allitsphysicalportstotheegresslistoftheLAG’sVLAN.
Typically ,two
ormoreportsarerequiredtoformaLAG.However,youcanenablethecreationof
singleportLAGsasdescribedin“setlacpsingleportlag”onpage7‐52.Ifasingle portLAGgoes
downandtheswitchstaysup,theswitchwillreconfiguretheLAGtothe
sameLAGnumberifthe 
portcomesbackup.
Commands
Note: To aggregate, underlying physical ports must be running in full duplex mode and must be of
the same operating speed.
For information about... Refer to page...
show lacp 7-47
set lacp 7-48
set lacp asyspri 7-49
set lacp aadminkey 7-49
clear lacp 7-50
set lacp static 7-50
clear lacp static 7-51