Specifications

Link Aggregation Configuration Example
December 02, 2010 Page 18 of 23
chassis.ThefirstLAGconsistsoftwo1Gbports.ThesecondLAGconsistsofeight100Mbpsports.
Inthisexamplewewillensurethatthetwo1GbportLAGformsbeforetheeight100Mbsport
LAG.
SeeFigure 4onpage 19foranillustrationofthisexample,includingport, keyand
portpriority
assignments.
TheLAGconfigurationwillensurethatthetwo1GbportsattachtothefirstavailableLAG
(LAG1).Theeight100MbpsportswillthenattachtothesecondavailableLAG(LAG2)
WhichdevicedeterminesportselectionfortheLAGisanoptionalconsideration.Forthis
example,systemprioritiesare
notmodified,thelowestMACaddressdevicewilldetermineport
selectionfortheLAG.
Therearetwophysicalportspeedsinourexample,100Mbpsand1Gb.ALAGonlymovesportsof
thesamespeedtotheattachedstate.Selectingtheportstomovetoattachedstateisbasedupon
the
lowestportpriority.Ifportprioritiesarethesame,thelowestportnumberbreaksthetie.For
ourexample,wewanttoensurethatthe1GbportsaremovedtotheattachedstatforLAG1.Port
priorityfor1Gbportsissetto100.Portpriorityfor100Mbpsportsis
leftatthedefaultvalueof
32768.
TheadminkeyforeachphysicalportandLAGintheexamp leissetto100.Thisensuresthat
LAGswillformforeachsetofports.
ForthisexamplewewillallowsingleportLAGstoform.ThesingleportLAGfeaturewillbe
set
toenabledforbothdevices.
Flowregenerationisenabledforbothdevicesinourexample.Thissettingwillensurethatshould
aLAGportdropoutandthenbecomeactiveagain,LACPwillredistributeexistingflowsoverall
theportsinthenewLAG.
Theoutputalgorithmdefaultsto
selectingtheoutputportbaseduponthedestinationandsource
IPaddress.Thissettingwillnotbechangedinourexample.