Configuring Dvmrp - SMC Networks SMC6724L3 Management Manual

C
ONFIGURING THE
CLI – This example shows that multicast forwarding is enabled. The
multicast routing table displays one entry for a multicast source routed by
DVMRP, and another source routed via PIM.
Console#show ip mroute
IP Multicast Forwarding is enabled.
IP Multicast Routing Table
Flags:
(234.5.6.7, 10.1.0.0, 255.255.255.0)
Owner: DVMRP
Upstream Interface: vlan2
Upstream Router: 10.1.0.0
Downstream:
(234.5.6.8, 10.1.5.19, 255.255.255.255)
Owner: PIM-DM
Upstream Interface: vlan3
Upstream Router: 10.1.5.19
Downstream:
Console#

Configuring DVMRP

The Distance-Vector Multicast Routing Protocol (DVMRP) behaves
somewhat similarly to RIP. A router supporting DVMRP periodically
floods its attached networks to pass information about supported
multicast services along to new routers and hosts. Routers that receive a
DVMRP packet send a copy out to all paths (except the path back to the
origin). These routers then send a prune message back to the source to
stop a data stream if the router is attached to a LAN which does not want
to receive traffic from a particular multicast group. However, if a host
attached to this router issues an IGMP message indicating that it wants to
subscribe to the concerned multicast service, this router will use DVMRP
3-222
S
WITCH
P - Prune, F - Forwarding
4-288