Example: Configuring PIM Dense Mode over Layer 3 VPNs

Multicast over Layer 3 VPNs for dense mode works much the same way as in sparse mode. In the following example, the VPN network uses dense mode for the entire multicast group range. Compare this with the configuration used in Example: Configuring PIM Sparse Mode over Layer 3 VPNs. In that configuration, sparse mode is used for the entire multicast group range.

To support PIM dense mode over Layer 3 VPNs, follow the same steps used in Example: Configuring PIM Sparse Mode over Layer 3 VPNs, with the following differences:

• Configure dense mode for the CE router using the mode statement at the [edit protocols pim interface] hierarchy level. In the example below, the CE-facing interface is t1-1/0/0:0.
• Configure dense mode in the routing instance of the PE router facing the CE router (configured for dense mode) using the mode statement at the [edit routing-instances instance-name protocols pim] hierarchy level.
• Remove the RP configurations from the CE router and from the routing instance on the PE router.

This section shows how to do the following tasks:

• Configuring PIM on the P Router
• Configuring PIM on the PE Router
• Configuring PIM on the CE Router
• Configuring the Routing Instance on the PE Router

For information about configuring VPNs, see the JUNOS VPNs Configuration Guide.

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