DELL PC7024 User Manual

DVMRP Commands

Distance Vector Multicast Routing Protocol (DVMRP) is a dense mode 

multicast protocol and is most appropriate for use in networks where 

bandwidth is relatively plentiful and there is at least one multicast group 

member in each subnet. DVMRP assumes that all hosts are part of a 

multicast group until it is informed of multicast group changes. When the 

dense-mode multicast router is informed of a group membership change, the 

multicast delivery tree is pruned. DVMRP uses a distributed routing 

algorithm to build per-source-group multicast trees. It is also called Broadcast 

and Prune Multicasting protocol. It dynamically generates per-source-group 

multicast trees using Reverse Path Multicasting. Trees are calculated and 

updated dynamically to track membership of individual groups. 

This chapter explains the following commands:

Use the ip dvmrp command to set the administrative mode of DVMRP in the 

router to active. IGMP must be enabled before DVMRP can be enabled.

2CSPC4.XCT-SWUM2XX1.book  Page 913  Monday, October 3, 2011  11:05 AM