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Configuring LAG Aggregator Keys and Priority

4-4 Configuring Link Aggregation

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a ttached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andportsthatwouldotherwise

aggregatearenot802.1Xauthorized.

AsshowninTable 4‐2,theLACPimplementationonMatrixDFE‐PlatinumSeries modulesorthe

N‐SAdevicewillallowasmanyportsaspossibleintoaLAG,whilethe implementationonMatrix

DFE‐GoldSeriesmoduleswillallowuptoamaximumoffour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othersgointoastandbystate.

Configuring LAG Aggregator Keys and Priority

Reviewing the Configuration

Bydefault,LACPwillbeenabledonallports.Aggregatoradminkeyandsystempriorityvalues

willbothbesetat32768,andnoLAGswillbeconfigured.

Usethiscommandtoreviewthecurrentconfiguration:

show lacp [port-string]

Example

Thisexampleshowshowtodisplayinformationforaggregatorport4.Inthiscase,defaultLACP

parametershavenotbeenchanged

Note: To aggregate, underlying physical ports must be running in full duplex mode and must be

of the same operating speed.

Matrix(rw)->show lacp lag.0.4

Aggregator: lag.0.4

Actor Partner

System Identifier: 00:e0:63:9d:b5:87 00:00:00:00:00:00

System Priority: 32768 32768

Admin Key: 32768

Oper Key: 32768 32768

Attached Ports: None.

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