Specifications

Configuring DVMRP
16-36 IPv4 Routing Protocol Configuration
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
ThecommandsusedtoenableandconfigureDVMRParelistedbelow:
* 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 3-29 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 SecureStack C3 stack. For details on enabling IGMP, refer to Chapter 10.
For information about... Refer to page...
ip dvmrp 16-37
ip dvmrp enable 16-37
ip dvmrp metric 16-38
show ip dvmrp 16-38