Ipv6 Multicast Forwarding Across Ipv6 Unicast Subnets - HP FlexNetwork 7500 Series Configuration Manual

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If an IPv6 multicast packet arrives at Router C on GigabitEthernet 1/0/2, the receiving interface
is the incoming interface of the (S, G) entry. Router C forwards the packet out of all outgoing
interfaces.
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If an IPv6 multicast packet arrives at Router C on GigabitEthernet 1/0/1, the receiving interface
is not the incoming interface of the (S, G) entry. Router C searches its IPv6 unicast routing table
and finds that the outgoing interface to the source (the RPF interface) is GigabitEthernet 1/0/2.
This means that the (S, G) entry is correct but the packet traveled along a wrong path. The
packet fails the RPF check, and Router C discards the packet.

IPv6 multicast forwarding across IPv6 unicast subnets

A network might have routers that do not support IPv6 multicast protocols. When IPv6 multicast data
is forwarded to a router of which the next hop supports only IPv6 unicast protocols, the forwarding
path is blocked. To implement IPv6 multicast forwarding across unicast subnets, you can establish a
tunnel between the IPv6 multicast routers at the edges of the two IPv6 unicast subnets.
Figure 86 IPv6 multicast data transmission through a tunnel
As shown in
Router A encapsulates IPv6 multicast data in unicast IPv6 packets, and forwards them to Router B
across the tunnel through IPv6 unicast routers. Then, Router B strips off the unicast IPv6 header and
continues to forward the IPv6 multicast data to the receiver.
Configuration task list
Tasks at a glance
(Required.)
(Optional.)
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(Optional.)
Enabling IPv6 multicast routing
Enable IPv6 multicast routing before you configure any Layer 3 IPv6 multicast functionality in the
public network or VPN instance.
Figure 86, a tunnel is established between IPv6 multicast routers Router A and Router B.
Enabling IPv6 multicast routing
Configuring IPv6 multicast routing and
Specifying the longest prefix match principle
Configuring IPv6 multicast load splitting
Configuring an IPv6 multicast forwarding boundary
Configuring IPv6 static multicast MAC address entries
Enabling IPv6 multicast forwarding between sub-VLANs of a super VLAN
forwarding:
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