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mickdoev
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Posts: 14
Joined: Fri Mar 17, 2023 2:44 am

PIM MFC table

Mon Mar 20, 2023 8:16 am

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
 
wiseroute
Member
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Posts: 352
Joined: Sun Feb 05, 2023 11:06 am

Re: PIM MFC table

Mon Mar 20, 2023 11:50 am

hello.

ok. please wait. let us re-post your output in code tag. as follows:

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---------------[b]unknown--------------------------------------------------bridge, ether1[/b]
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

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 :

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


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??
 
mickdoev
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Topic Author
Posts: 14
Joined: Fri Mar 17, 2023 2:44 am

Re: PIM MFC table

Mon Mar 20, 2023 2:19 pm

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.

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