4000 Router Series IP Multicast Configuration Guide

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IPv6 multicast forwarding across IPv6 unicast subnets

Routers forward the IPv6 multicast data from an IPv6 multicast source hop by hop along the forwarding

tree, but some routers might not support IPv6 multicast protocols in a network. When the IPv6 multicast

data is forwarded to a router that does not support IPv6 multicast, the forwarding path is blocked. In this

case, you can enable IPv6 multicast data forwarding across the IPv6 unicast subnets by establishing a

tunnel between the routers at both ends of the IPv6 unicast subnets.

Figure 38 IPv6 multicast data transmission through a tunnel

As shown in Figure 38, with a tunnel established between the multicast routers Router A and Router B,

Router A encapsulates the IPv6 multicast data in unicast IPv6 packets, and forwards them to Router B

across the tunnel through unicast routers. Then, Router B strips off the unicast IPv6 header and continues

to forward the IPv6 multicast data down toward the receivers.

Configuration task list

Tasks at a

lance

(Required.) Enabling IPv6 multicast routing

(Optional.) Configuring IPv6 multicast routing and forwarding

• (Optional.) Configuring the RPF route selection rule

• (Optional.) Configuring IPv6 multicast load splitting

• (Optional.) Configuring an IPv6 multicast forwarding boundary

• (Optional.) Configuring IPv6 static multicast MAC address entries

Enabling IPv6 multicast routing

Enable IPv6 multicast routing before you configure any Layer 3 IPv6 multicast functionality in the public

network or VPN instance.

To enable IPv6 multicast routing:

Ste

Command

Remarks

1. Enter system view.

system-view N/A