Pim Sm - TP-Link T3700G-28TQ User Manual

Configuration Procedure

Configure Switch A:

Step Operation
1 Configure interface.
2 Configure routing
protocol.
3 Enable multicast
routing and PIM DM
Configure Switch B and C:

Step Operation
1 Configure
interface
2 Configure routing
protocol
3 Enable multicast
routing and PIM
DM
4 Enable IGMP

11.4 PIM SM

PIM DM uses the "flood-and-prune" mode to create the SPT for transferring multicast data.
Although SPT has the short path, its building-up process is of low efficiency and does not apply
to the large and medium-sized network.
PIM SM is a multicast routing protocol in sparse mode. It uses the "Pull Mode" to transfer
multicast data and usually applies to large and medium-sized network with relatively sparse
multicast group members.
The working mechanism of PIM SM is illustrated as below:
PIM SM assumes that no hosts need to receive the multicast data, the multicast data will not

be forwarded to the host unless there is an explicitly request for the traffic. The core task of
PIM SM to realize multicast forwarding is to build and maintain the RPT (Rendezvous Point
Tree). RPT selects a certain router in the PIM domain as the public RP (rendezvous point),
through which the multicast data is transferred along the RPT to the receivers.
Description
Configure IP addresses and subnet masks of VLAN interfaces 1, 2
and 3 on Routing→ Interface→Interface Config page.
Configure the routing entries via static route or dynamic routing
protocol like OSPF, and make sure all the switches can
communicate with each other and update the routing information
through a unicast routing protocol dynamically.
Enable multicast routing on Multicast Routing→Global Config
page. Enable PIM DM on VLAN interfaces 1, 2 and 3 on Multicast
Routing→PIM DM→PIM DM Interface page.
Description
Configure IP addresses and subnet masks of VLAN interfaces 2,
3, 4 and 5 on Routing→Interface→Interface Config page.
Configure the routing entries via static route or dynamic routing
protocol like OSPF, and make sure all network can communicate
with each other.
Enable multicast routing on Multicast Routing→Global Config
page. Enable PIM DM on VLAN interfaces 2, 3, 4 and 5 on
Multicast Routing→PIM DM→PIM DM Interface page.
Enable IGMP on the VLAN interfaces 4 and 5 which connect to the
receivers on Multicast Routing→IGMP→Interface Config page.
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