Configuration Procedure
Configure Switch A:
Step Operation
Description
1
Configure interface. Configure IP addresses and subnet masks of VLAN interfaces 1, 2
and 3 on
Routing→ Interface→Interface Config
page.
2
Configure routing
protocol.
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.
3
Enable multicast
routing and PIM DM
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.
Configure Switch B and C:
Step Operation
Description
1
Configure
interface
Configure IP addresses and subnet masks of VLAN interfaces 2,
3, 4 and 5 on
Routing→Interface→Interface Config
page.
2
Configure routing
protocol
Configure the routing entries via static route or dynamic routing
protocol like OSPF, and make sure all network can communicate
with each other.
3
Enable multicast
routing and PIM
DM
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.
4
Enable IGMP
Enable IGMP on the VLAN interfaces 4 and 5 which connect to the
receivers on
Multicast Routing→IGMP→Interface Config
page.
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.
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