Load distribution not so even for multicast traffic (ECMP) between a GSR 12410 (XR) and a CRS-1 router

Hi,
I have a scenario in which I see the multicast S,G streams are distributed not so even in the 3 interfaces between a GSR 12404 (XR 3.8.4) and a CRS1 (XR 3.6.2). The multicast mode is SSM.
The total S,G (sources and multicast groups) are 82.
The topology is as follows:
                                               ---link 1--------
 Multicast sources ----- CRS1 ---link 2-------- GSR12404------- Receivers
                                                ---link 3--------
From the total of 82 S,G coming from multicast sources, I see the following S,G distribution between the three links:
Link 1: 37 S,G
Link 2: 21 S,G
Link 3: 24 S,G
The big question is why the Link 1 has very different number of S,G compared to link 2 and link 3?
Multipath is enabled on both links. I copy the multicast configuration of CRS and GSR that is the same:
multicast-routing
 address-family ipv4
  interface GigabitEthernet0/2/0/0
   enable
  interface GigabitEthernet0/2/1/1
   enable
  interface GigabitEthernet0/2/1/2
   enable
  nsf
  multipath
  ssm range SSM
Thanks,
Carlos.

Hi Agherardi,
Did you try to disable your firewall and refer the following KB to confirm you have choose the correct Affinity and Load-Balancing Behavior of the Custom Port Rule.
Specifying the Affinity and Load-Balancing Behavior of the Custom Port Rule
https://technet.microsoft.com/en-us/library/cc759039(v=ws.10).aspx
More information:
Using NLB
https://technet.microsoft.com/en-us/library/bb687542.aspx
I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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