How MDT-based MVPN works

For a VPN instance, multicast data transmission on 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.

NOTE:

The following types of PIM neighboring relationships exist in MVPN:

PE-P PIM neighboring relationship—Established between the public network interface on a PE and the peer interface on the P device over the link.
PE-PE PIM neighboring relationship—Established between PEs that are in the same VPN instance after they receive the PIM hello packets.
PE-CE PIM neighboring relationship—Established between a PE interface that is bound with the VPN instance and the peer interface on the CE over the link.

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