HP MSR ASM Configuration Manual page 241

Share-MDT establishment in a BIDIR-PIM network
Figure 65 Share-MDT establishment in a BIDIR-PIM network
As shown in
A. The process of establishing a share-MDT is as follows:
1. The public network on PE 1 initiates a join to the public network RP, with the share-group address
as the multicast group address in the join message, and a (*, 239.1.1.1) entry is created on each
device along the path on the public network.
2. At the same time, PE 2 and PE 3 initiate a similar join process, respectively.
Finally, the receiver-side RPT is established in the MD, with the public network RP as the root and
PE 1, PE 2 and PE 3 as leaves.
3. The public network on PE 1 sends multicast data, with the share-group address as the destination
multicast group address. The DF on each subnet that the multicast data travels through on the
public network unconditionally forwards the data to the RP, and a (*, 239.1.1.1) entry is created
on each device along the path.
4. At the same time, PE 2 and PE 3 initiate a similar process, respectively.
Finally, the source-side RPT is established in the MD, with PE 1, PE 2, and PE 3 as the roots and the
public network RP as the leave.
In the BIDIR-PIM network, the receiver-side RPT and the source-side RPT constitute a bi-directional RPT
(namely, the (*, 239.1.1.1) tree) which is a share-MDT.
Figure 65, BIDIR-PIM is enabled in the network and all the PE devices support VPN instance
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