To minimize the repeated flooding of datagrams and subsequent pruning associated with a particular source-group (S,G) pair, PIM-DM uses a State Refresh message. This message is sent by the router(s) directly connected to the source and is propagated throughout the network. When received by a router on its RPF interface, the State Refresh message causes an existing prune state to be refreshed. State Refresh messages are generated periodically by the router directly attached to the source.

PIM-DM is appropriate for:

Densely distributed receivers

A ratio of few senders-to-many receivers (due to frequent flooding)

High volume of multicast traffic

Constant stream of traffic

Example: PIM-DM

The following example configures PIM-DM for IPv4 on a router.

First, configure an OSPF1 router and globally enable IP routing, multicast, IGMP, and PIM-DM. Next, enable routing, IGMP, PIM-DM, and OSPF on one more interfaces.

console#configure router ospf

router-id 3.3.1.1 exit

ip routing ip multicast ip igmp

ip pimdm interface vlan 1

routing

ip address 3.3.3.1 255.255.255.0 ip pimdm

ip igmp

ip ospf area 0 exit

interface vlan 3 routing

ip address 1.1.1.1 255.255.255.0 ip pimdm

ip igmp

ip ospf area 0 exit

exit

1.OSPF configuration is added as a unicast protocol for illustration purposes; static unicast routing could also be configured.

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Dell 6200 SERIES manual Example PIM-DM

6200 SERIES specifications

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