Netgear M5300-52G3 (GSM7352Sv2h2) - ProSAFE 48 ports managed L3 gigabit stackable switch Administrator's Guide

The Distance Vector Multicast Routing Protocol (DVMRP) is used for multicasting over IP 
networks without routing protocols to support multicast. The DVMRP is based on the RIP 
protocol but more complicated than RIP. DVRMP maintains a link-state database to keep 
track of the return paths to the source of multicast packages.

The DVMRP operates as follows:

The first message for any source-group pair is forwarded to the entire multicast network, 
with respect to the time-to-live (TTL) of the packet.

TTL restricts the area to be flooded by the message. 

All the leaf routers that do not have members on directly attached subnetworks send back 

prune messages to the upstream router. 

The branch that transmitted a prune message is deleted from the delivery tree. 

The delivery tree, which is spanning to all the members in the multicast group, is 
constructed.

In this example, DVMRP is running on switches A, B, and C. IGMP is also running on 
Switch

 

C, which is connected to the host directly. After the host sends an IGMP report to 

switch C, multicast streams are sent from the multicast resource to the host along the path 
built by DVMRP.

192.168.1.0/24

1/0/1

1/0/21

192.168.5.0/24

192.168.3.0/24

1/0/11

1/0/24

1/0/3

1/0/13

1/0/13

192.168.4.0/24

192.168.4.0/24

1/0/20