Enterasys Networks D-Series - page 164

Link Aggregation Control Protocol (LACP)
6-38 Port Configuration
is,willblockredundantpaths).Forinformationaboutbuildingstaticaggregations,refertoset
lacpstatic(page6‐42).
EachD‐Series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.x.xportdesignation.LACP
determineswhichunderlyingphysicalportsarecapableofaggregating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authenticationisenabledusingtheseteapolcommand(page 17‐19)andportsthat
wouldotherwiseaggregatearenot802.1Xauthorized.
TheLACPimplementationontheD‐Series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.
WhenanexistingdynamicallycreatedLAGisreducedtooneport,theD‐SeriesremovestheLAG
fromitsVLANandaddstheremainingunderlyingporttotheVLAN.Forthisreason,youshould
ensurethattheLAGandalltheportsintheLAGareassignedtotheegresslistofthedesired
VLAN.Otherwise,whentheLAGisremoved,theremainingportmaybeassignedtothewrong
VLAN.Theotheroptionistoenablethesingleportlagfeatureasdescribedin“setlacp
singleportlag”onpage6‐44.
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 6-39
set lacp 6-40
set lacp asyspri 6-41
set lacp aadminkey 6-41
clear lacp 6-42
set lacp static 6-42
clear lacp static 6-43
set lacp singleportlag 6-44