AutoVPN Protocol Independent Multicast (PIM) point-to-multipoint mode

In hub-and-spoke topologies, multicast data is used for applications such as video streaming or the music-on-hold function for VoIP systems. The multicast sender is typically located behind the hub, although the sender could also be located behind a spoke or a set of spokes.

AutoVPN secure tunnel st0 logical interfaces on hub-and-spoke devices are configured for PIM point-to-multipoint mode. This allows devices in the network to replicate multicast data packets to neighbors that join the multicast group. PIM and multipoint must be enabled on multicast sending and receiving interfaces on the devices. To enable PIM on an st0 logical interface, use the set protocols pim interface st0.x configuration statement. To enable multipoint on an st0 logical interface, use the multipoint configuration statement at the [edit interfaces st0 unit x] hierarchy level.

Configure dynamic routing protocols to support multicast traffic:

• OSPF-Configure the st0 logical interface as an OSPF interface at the [edit protocols ospf area area-id interface] hierarchy level and specify the interface-type p2mp and dynamic-neighbor options.
• BGP-On the hub, configure the local-address option at the [edit protocols bgp group bgp-group] hierarchy level with the address of the st0 logical interface; configure the neighbor or the allow option to match the st0 addresses on the spokes. On the spoke, configure the local-address option at the [edit protocols bgp group bgp-group] hierarchy level with the address of the st0 logical interface; configure the neighbor option to match the st0 address on the hub. Configure policy statements at the [edit policy-options] hierarchy level to limit the number of advertised routes.