Specifications

ManualsBrandsEnterasys ManualsComputer equipmentN Standalone (NSA) Series

381

382

383

384

385

386

387

388

389

390

VLAN Support on Enterasys Switches

March 15, 2011 Page 8 of 20

Asdescribedabove,PVIDdeterminestheVLANtowhichalluntaggedframesreceivedon

associatedportswillbeclassified.PolicyclassificationtoaVLANtakesprecedenceoverPVID

assignmentif:

•policyclassificationisconfiguredtoaVLAN,and

•PVIDoverridehasbeenenabledforapolicyprofile,andassignedtoport(s)associated

with

thePVID.

Formoreinformation,refertothePolicyClassificationchapterinyourdevice’sconfiguration

guideorthe“Configuring Policy”FeatureGuide.

GARP VLAN Registration Protocol (GVRP) Support

ThepurposeoftheGARP(GenericAttributeRegistration Protocol)VLANRegistrationProtocol

(GVRP)istodynamicallycreateVLANsacrossaswitched network.GVRPallowsGVRP‐aware

devicestodynamicallyestablishandupdatetheirknowledgeofthesetofVLANsthatcurrently

haveactivemembers.

Bydefault,GVRPisgloballyenabledbut

disabledattheportlevelonallEnterasysdevicesexcept

theN‐Series.OntheN‐Series,GVRPisenabledgloballyandattheportlevel.ToallowG VRPto

dynamicallycreateVLANs,itmustbeenabledgloballyandalsooneachindividualportas

describedin“ConfiguringDynamicVLANs”

onpage15.

How It Works

WhenaVLANisdeclared,theinformationistransmitted outGVRPconfiguredportsonthe

deviceinaGARPformattedframeusingthe GVRPmulticastMACaddress.Aswitchthatreceives

thisframeexaminestheframeandextractstheVLANIDs.GVRPthendynamicallyregisters

(creates)theVLANsandaddsthe

receivingporttoitstaggedmemberlistfortheextractedVLAN

IDs.TheinformationisthentransmittedouttheotherGVRPconfiguredportsofthedevice.

Figure 3showsanexampleofhowVLANBluefromendstationAwouldbepropagatedacrossa

switchnetwork.Inthisfigure,port1of

Switch4isregisteredasbeingamemberofVLANBlue

andSwitch4declaresthisfactoutallitsports(2and3)toSwitch1andSwitch 2.Thesetwo

switchesregisterthisintheportegresslistsoftheports(Switch1,port1andSwitch2,port

1)that

receivedtheframeswiththeinformation.Switch 2,whichisconnectedtoSwitch3andSwitch5

declaresthesameinformationtothosetwoswitchesandtheportegresslistofeachportis

updatedwiththenewinformation,accordingly.