Sect 6.3 Mcast ICMP echo-reply

Hello,
In the section 6.3 the multicast icmp reply in R7 is showing R4's loopback0.
I put exactly the configuration given in the solution, but it doesn't work.

Rack1R7#ping 224.1.2.3

Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.1.2.3, timeout is 2 seconds:

Reply to request 0 from 131.1.4.4, 928 ms
Rack1R7#

It seems that in a PE the icmp-reply address for multicast in the VPN will be the PE loobpacks, as this loopback is the MDT source address, although the PE loopback is not in the VRF.

So, it wouldn't be better to put the igmp join-group in BB2 and see the icmp-reply with BB2 address .254 ?

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