4000 Router Series IP Multicast Configuration Guide

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Figure 65 Multi-hop EBGP interconnectivity

By using this method, only one MD needs to be established for all the ASs, and public network multicast

traffic between different ASs is transmitted within this MD.

Multicast VPN configuration task list

Task at a

lance

(Required.) Enabling IP multicast routing in a VPN instance

(Required.) Creating the MD for a VPN instance

(Required.) Specifying the default-group address

(Required.) Specifying the MD source interface

The MTI interfaces are automatically created and bound with the VPN instance when you create the MD

for the VPN instance. Follow these guidelines to make sure the MTI interfaces are correctly created.

• The MTI interfaces take effect only after the default-group is specified and the MD source interface

gets the public IP address.

• The PIM mode on the MTI must be the same as the PIM mode running on the VPN instance to which

the MTI belongs. When at least one interface on the VPN instance is enabled with PIM, the MTI is

enabled with PIM accordingly. When all interfaces on the VPN instance are disabled with PIM, PIM

is also disabled on the MTI.

Configuring MD-VPN

This section describes how to configure MD-VPN.

Configuration prerequisites

Before you configure MD-VPN, complete the following tasks:

• Configure a unicast routing protocol on the public network.

• Configure MPLS L3VPN on the public network.

• Configure PIM (PIM-DM, PIM-SM, or PIM-SSM) on the public network.

• Determine the VPN instance names and RDs.