Enabling/Disabling GVRP (GARP VLAN Registration Protocol)
D-Series CLI Reference 7-19
Enabling/Disabling GVRP (GARP VLAN Registration Protocol)

About GARP VLAN Registration Protocol (GVRP)

Thefollowingsectionsdescribethedeviceoperationwhenitsportsareoperatingunderthe
GenericAttributeRegistrationProtocol(GARP)applicationGARPVLANRegistrationProtocol
(GVRP).

Overview

ThepurposeofGVRPistodynamicallycreateVLANsacrossaswitchednetwork.WhenaVLAN
isdeclared,theinformationistransmittedoutGVRPconfiguredportsonthedeviceinaGARP��
formattedframeusingtheGVRPmulticastMACaddress.Aswitchthatreceivesthisframe,
examinestheframe,andextractstheVLANIDs.GVRPthencreatestheVLANsandaddsthe
receivingporttoitstaggedmemberlistfortheextractedVLANID(s).Theinformationisthen
transmittedouttheotherGVRPconfiguredportsofthedevice.Figure 77showsanexampleof
howVLANbluefromendstationAwouldbepropagatedacrossaswitchnetwork.

How It Works

InFigure 77onpage 720,Switch4,port1isregisteredasbeingamemberofVLANBlueand
thendeclaresthisfactoutallitsports(2and3)toSwitch1andSwitch 2.Thesetwodevices
registerthisintheportegresslistsoftheports(Switch1,port1andSwitch2,port1)thatreceived
theframeswiththeinformation.Switch2,whichisconnectedtoSwitch3andSwitch5declares
thesameinformationtothosetwodevicesandtheportegresslistofeachportisupdatedwiththe
new���information,accordingly.
ConfiguringaVLANonan802.1QswitchcreatesastaticVLANentry.Theentrywillalways
remainregisteredandwillnottimeout.However,dynamicentrieswilltimeoutandtheir
registrationswillberemovedfromthememberlistiftheendstationAisremoved.Thisensures
that,ifswitchesaredisconnectedorifendstationsareremoved,theregisteredinformation
remainsaccurate.
TheendresultisthattheportegresslistofaportisupdatedwithinformationaboutVLANsthat
resideonthatport,eveniftheactualstationontheVLANisseveralhopsaway.