Ipv6 Multicast Forwarding Across Ipv6 Unicast Subnets - HP MSR2003 Configuration Manual

Figure 73 RPF check process
IPv6 Routing Table on Router C
Destination/Prefix
2000::/16
Source
2000::101/16
As shown in
configured. The IPv6 multicast packets travel along the SPT from the multicast source to the receivers. The
IPv6 multicast forwarding table on Router C contains the (S, G) entry, with GigabitEthernet 1/0/2 as the
RPF interface.
• If an IPv6 multicast packet arrives at Router C on GigabitEthernet 1/0/2, Router C forwards the
packet out of all outgoing interfaces.
If an IPv6 multicast packet arrives at Router C on GigabitEthernet 1/0/1, Router C performs an RPF
•
check on the packet. 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 RPF check fails and the router discards
the packet.

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 74 IPv6 multicast data transmission through a tunnel
Interface
GE1/0/2
Router A
IPv6 Multicast packets
Figure 73, assume that IPv6 unicast routes are available in the network, IPv6 MBGP is not
Router B
GE1/0/1
GE1/0/1
GE1/0/2
Router C
247
Receiver
Receiver