Example: Configuring PIM Sparse-Dense Mode over Layer 3 VPNs

Multicast over Layer 3 VPNs for sparse-dense mode works much the same way as in sparse mode. In the following example, the VPN network uses dense mode for group range 229.0.0.0/8 and sparse mode for the remaining multicast group range outside 229.0.0.0/8. 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 sparse-dense mode for the CE router and PE router interfaces 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 the dense-groups statement to define the desired group range on the CE router at the [edit protocols pim] hierarchy level and in the routing instance at the [edit routing-instances instance-name protocols pim] hierarchy level 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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