R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

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Figure 17 Multicast data transmission through a tunnel
As shown in Figure 17, with a tunnel established between the multicast routers Switch A and Switch B,
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
g
lance
(Required.) Enabling IP multicast routing
(Optional.) Configuring multicast routing and forwarding
• (Optional.) Configuring static multicast routes
• (Optional.) Configuring the RPF route selection rule
• (Optional.) Configuring multicast load splitting
• (Optional.) Configuring static multicast MAC address entries
NOTE:
The device can route and forward multicast data only through the primary IP addresses of interfaces,
rather than their secondary addresses or unnumbered IP addresses. For more information about primar
y
and secondary IP addresses, and IP unnumbered, see Layer 3—IP Services Configuration Guide .
Enabling IP multicast routing
Before you configure any Layer 3 multicast functionality, you must enable IP multicast routing.
To enable IP multicast routing: