250
To implement M6VPE, you just need to upgrade PE devices without any changes to CE devices or P
devices. For carriers, M6VPE is a cost-effective solution to IPv6 multicast access services over
existing IPv4 networks.
Figure 74 M6VPE networking diagram
As shown in
, the public network runs IPv4 protocols, and the VPN network runs IPv6
protocols. To implement IPv6 multicast traffic forwarding between CE1 and CE 2, M6VPE is required
on the PE devices.
M6VPE can operate properly only when PIM-DM, PIM-SM or PIM-SSM runs on the public network
and IPv6 PIM-SM or IPv6 PIM-SSM runs between the CE devices and PE devices.
Protocols and standards
draft-rosen-vpn-mcast-08,
Multicast in MPLS/BGP IP VPNs
How MD-VPN works
This section describes how the MD-VPN technology is implemented, including the construction of a
share-MDT, delivery of multicast traffic based on the share-MDT, and implementation of multi-AS
MD-VPN.
For a VPN instance, multicast data transmission in the public network is transparent. The VPN data
is exchanged between the MTIs of the local PE and the remote PE. This implements the seamless
transmission of the VPN data over the public network. However, the multicast data transmission
process (the MDT transmission process) over the public network is very complicated.
Share-MDT establishment
The multicast routing protocol running in the public network can be PIM-DM, PIM-SM, BIDIR-PIM, or
PIM-SSM. The process of creating a share-MDT is different in these PIM modes.
