Just to see if in this way the picture is seen better:
-------------
Hi
I’ve three routers in a broadcast domain: A, B and C.
source ---- WAN ---- A ----- lan ----- C ---- receiver
|
B
A is the one where multicast traffic arrives from WAN (and also RP in my lab),
B is the PIM DR of the lan and C is where igmp helper-address is configured
(pim passive on the lan).
The only way to make the stub igmp helper configuration on router C is to make
A as PIM DR.
I’m wondering to understand the reason ?
Tks
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