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Figure 18 Multicast data transmission through a tunnel
As shown in Figure 18, a tunnel is established between the multicast routers Router A and Router B.
Router A encapsulates the multicast data in unicast IP packets, and forwards them to Router B
across the tunnel through unicast routers. Then, Router 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.
Command and hardware compatibility
Commands and descriptions for centralized devices apply to the following routers:
MSR1002-4/1003-8S.
MSR2003.
MSR2004-24/2004-48.
MSR3012/3024/3044/3064.
MSR954 (JH296A/JH297A/JH298A/JH299A/JH373A).
MSR958 (JH300A/JH301A).
Commands and descriptions for distributed devices apply to the following routers:
MSR4060.
MSR4080.
Configuration task list
(Required.) Enabling IP multicast routing
(Optional.) Configuring multicast routing and forwarding:
• (Optional.) Configuring static multicast routes
• (Optional.) Specifying the longest prefix match principle
• (Optional.) Configuring multicast load splitting
• (Optional.) Configuring a multicast forwarding boundary
• (Optional.) Configuring static multicast MAC address entries
• (Optional.) Enabling multicast forwarding between sub-VLANs of a super VLAN
Tunnel
Unicast router
Unicast router
Unicast router
Unicast router
Multicast router
Multicast router
Router ASource ReceiverRouter B
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