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Configuring the Routing Table Group

Configure the multicast routing table group by adding the VPNA-mcast-rib statement at the [edit routing-options] hierarchy level. This group accesses inet.2 when doing RPF checks. However, if you are using inet.0 for multicast RPF checks, this step will prevent your multicast configuration from working.

You must also include the interface routes in inet.2. For more information about creating routing table groups, see the JUNOS Routing Protocols Configuration Guide.



routing-options {


interface-routes {
rib-group VPNA-mcast-rib;
}




rib-groups {


VPNA-mcast-rib {
export-rib VPN-A.inet.2;
import-rib VPN-A.inet.2;
}


}


}

After you configure the multicast routing table group, activate it by including the rib-group inet VPNA-mcast-rib statement at the [edit routing-instances instance-name protocols pim] hierarchy level of the VPN's VRF instance.



routing-instances {


VPN-A {


protocols {


pim {
rib-group inet VPNA-mcast-rib;
}


}


}


}

Use the following commands to verify the configuration:

To display all PE tunnel interfaces, issue the show pim join command from the provider router acting as the RP.

To display multicast tunnel information and the number of neighbors, issue the show pim interfaces instance instance-name command from the PE1 or PE2 router. When issued from the PE1 router, the output display is:

user@host> show pim interfaces instance
VPN-A

Instance: PIM.VPN-A
Name                   Stat Mode       IP V State Count DR address
lo0.1                  Up   Sparse      4 2 DR        0 10.10.47.101
mt-1/1/0.32769         Up   Sparse      4 2 DR        1
mt-1/1/0.49154         Up   Sparse      4 2 DR        0
pe-1/1/0.32769         Up   Sparse      4 1 P2P       0
t1-2/1/0:0.0           Up   Sparse      4 2 P2P       1

To display multicast tunnel interface information, DR information, and the PIM neighbor status between VRF instances on PE1 and PE2, issue the show pim neighbors instance instance-name command from either PE router. When issued from the PE1 router, the output display is:
user@host> show pim neighbors instance VPN-A
```
Instance: PIM.VPN-A
Interface           IP V Mode        Option      Uptime Neighbor addr
mt-1/1/0.32769       4 2             HPL       01:40:46 10.10.47.102
t1-1/0/0:0.0         4 2             HPL       01:41:41 192.168.196.178
```

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