Multicast Forwarding Across Unicast Subnets; Configuration Task List - HP 5920 series Configuration Manual

and Switch D, specifying Switch B as the RPF neighbor of Switch C and Switch C as the RPF neighbor of
Switch D, the receiver hosts can receive the multicast data from the multicast source.
NOTE:
A static multicast route is effective only on the multicast router on which it is configured, and will not be
advertised throughout the network or redistributed to other routers.

Multicast forwarding across unicast subnets

Routers forward the multicast data from a multicast source hop by hop along the forwarding tree, but
some routers might not support multicast protocols in a network. When the multicast data is forwarded
to a router that does not support IP multicast, the forwarding path is blocked. In this case, you can enable
multicast forwarding across two unicast subnets by establishing a tunnel between the routers at the edges
of the two unicast subnets.
Figure 17 Multicast data transmission through a tunnel
As shown in
Switch A encapsulates the multicast data in unicast IP packets, and forwards them to Switch B across the
tunnel through unicast routers. Then, Switch B strips off the unicast IP header and continues to forward the
multicast data to the receiver.
To use this tunnel only for multicast traffic, configure the tunnel as the outgoing interface only for multicast
routes.

Configuration task list

Tasks at a glance
(Required.)
(Optional.)
•
(Optional.)
•
(Optional.)
•
(Optional.)
•
(Optional.)
Figure 17, with a tunnel established between the multicast routers Switch A and Switch B,
Enabling IP multicast routing
Configuring multicast routing and forwarding
Configuring static multicast routes
Configuring the RPF route selection rule
Configuring multicast load splitting
Configuring static multicast MAC address entries
36