Hi,
I would really appreciate some guidance / advice on the below.

I have 3 Mikrotik R82011UiAS-RM running os6.49.7 connected in the following manner;

Multicast source A (233.75.215.1) --- LAN-A ---- ROUTER-A (RP) --- SHARED SEGMENT
Multicast source B (233.75.215.2) --- LAN-B ---- ROUTER-B --------- SHARED SEGMENT
Multicast source C (233.75.215.3) --- LAN-C ---- ROUTER-C -------- SHARED SEGMENT

In the MFC table (Routing / PIM) for ROUTER-A (rendezvous point), the entries for the multicast sources B and C are being reported as having an unknown incoming interface.
I would have expected the incoming interface for these multicast sources to be ether1???

ROUTER A - MFC TABLE
GROUP------------------SOURCE---------------------RP---------------------INCOMING INTERFACE------------------------------OUTGOING INTERFACE
233.75.215.1-----------192.168.1.254 --------------10.0.1.1---------------bridge------------------------------------------------------ether1
233.75.215.2-----------192.168.2.254 --------------10.0.1.1---------------unknown--------------------------------------------------bridge, ether1
233.75.215.3-----------192.168.3.254 --------------10.0.1.1---------------unknown--------------------------------------------------bridge, ether1

ROUTER B - MFC TABLE
GROUP------------------SOURCE---------------------RP---------------------INCOMING INTERFACE------------------------------OUTGOING INTERFACE
233.75.215.1-----------192.168.1.254 --------------10.0.1.1---------------ether1------------------------------------------------------bridge
233.75.215.2-----------192.168.2.254 --------------10.0.1.1---------------bridge------------------------------------------------------register
233.75.215.3-----------192.168.3.254 --------------10.0.1.1---------------ether1------------------------------------------------------bridge

ROUTER C - MFC TABLE
GROUP------------------SOURCE---------------------RP---------------------INCOMING INTERFACE------------------------------OUTGOING INTERFACE
233.75.215.1-----------192.168.1.254 --------------10.0.1.1---------------ether1------------------------------------------------------bridge
233.75.215.2-----------192.168.2.254 --------------10.0.1.1---------------ether1------------------------------------------------------bridge
233.75.215.3-----------192.168.3.254 --------------10.0.1.1---------------bridge------------------------------------------------------register

I would like to know if the entries I am seeing are expected? I have a suspicion that the RP maybe causing packet duplication and PIM ASSERT issues by retransmitting inbound multicast packets it receives back out interface ether1??

Thanks in advance

hello.

ok. please wait. let us re-post your output in code tag. as follows:
hmm.. it doesn't work. maybe anyone could help me how to make that screen wide code tag?

ok. i think mikrotik pim-sm guide is already available in the help page.

and continue with your pim :
since i can't make that code tag better hence i could only guess: your 3 routers all connected to the same broadcast media? ie. not in serial way?

would like to know if the entries I am seeing are expected? I have a suspicion that the RP maybe causing packet duplication and PIM ASSERT issues by retransmitting inbound multicast packets it receives back out interface ether1??

have you made any pim filter??

Thanks for your reply.
Yes, each router is connected to the same broadcast network via the ether1 port.
No, I have not created any PIM filters.