Enterasys G3G170-24 - Configuring DVMRP; Commands; Enabling DVMRP on an Interface; Purpose

Configuring DVMRP
Enterasys G-Series CLI Reference 16-31
Configuring DVMRP
Purpose
ToenableandconfiguretheDistanceVectorMulticastRoutingProtocol(DVMRP)onaninterface.
DVMRProutesmulticasttrafficusingatechniqueknownasReversePathForwarding.Whena
routerreceivesapacket,itfloodsthepacketoutofallpathsexcepttheonethatleadsbacktothe
packet’ssource.Doing
soallowsadatastreamtoreachallVLANs(possiblymultipletimes).Ifa 
routerisattachedtoasetofVLANsthatdonotwanttoreceivefromaparticularmulticastgroup,
theroutercansenda“prune”messagebackupthedistributiontreetostopsubsequentpackets
from
travelingwheretherearenomembers.DVMRPwillperiodicallyrefloodinordertoreach
anynewhoststhatwanttoreceivefromaparticulargroup.
Commands
Enabling DVMRP on an Interface
DVMRPisdisabledbydefault,bothgloballyandoneachinterface.EnablingDVMRPonarouted
interfacerequirescompletingthestepslistedinTable 16‐1.
* Advanced License Required *
DVMRP is an advanced routing feature that must be enabled with a license key. If you have purchased an
advanced license key, and have enabled routing on the device, you must activate your license as described
in “Activating Licensed Features” on page 2-27.in order to enable the DVMRP command set. If you wish to
purchase an advanced routing license, contact Enterasys Networks Sales.
Note: IGMP must be enabled on all VLANs running DVMRP, and must also be globally enabled
on the G-Series. For details on enabling IGMP, refer to Chapter 10.
For information about... Refer to page...
ip dvmrp 16-32
ip dvmrp enable 16-32
ip dvmrp metric 16-33
show ip dvmrp 16-33
Table 16-1 Commands to Enable DVMRP on an Interface
To do this... Use these commands...
Globally enable IGMP. “ip igmp” on page 10-10
Globally enable DVMRP. “ip dvmrp” on page 16-32.
Enable IGMP on each interface. “ip igmp enable” on page 10-10
Enable DVMRP on each interface . “ip dvmrp enable” on page 16-32