Specifications

Routing Protocol Configuration Command Set
Configuring DVMRP
12-76 Matrix DFE-Gold Series Configuration Guide
12.2.4 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 and described in the
associated section as shown:
• ip dvmrp (Section 12.2.4.1)
• ip dvmrp metric (Section 12.2.4.2)
• show ip dvmrp route (Section 12.2.4.3)
NOTE: IGMP must be enabled on all VLANs running DVMRP. To do this, use the set
igmp enable command as described in Section 9.4.1.2. It is also recommended that
IGMP querying be enabled on all VLANs running DVMRP. To do this, use the set igmp
query-enable command as described in Section 9.4.2.2.