Posted on June 20, 2019 7:53 pm
 |  Asked by Emiel Raaijmakers
 |  97 views
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We currently have a querier (v3) running on VLAN 400 and it perfectly works for multicast group joins within that VLAN. However when performing a source specific group join it seems to forward traffic from other sources as well.

My transmitting part is sending on group 239.211.4.99 with source address 172.216.0.25
My receiving part is subscribed to group 239.211.4.99 with source address 172.216.0.11

There is not multicast traffic to group 239.211.4.99 from source 172.216.0.11; Expected result is that no multicast packets would be received, but it receives all traffic from 172.216.0.25. What configuration is required to enable source specific multicast on the same VLAN?

arista(config)#show ip igmp snooping querier detail
Vlan IP Address Version Port
—————————————-
400 10.40.0.1 v3 Switch

arista(config)#show ip igmp snooping querier membership
————————————————————————-
Vlan: 400 Elected: 10.40.0.1 QQI: 5 QRV: 2 QRI: 5 GMI: 15

Groups Mode Ver Num of Sources
————————————————————————-
224.0.1.129 EX v2 0 []
239.211.4.99 IN v3 1 [ 172.216.0.11 ]
239.216.0.71 EX v2 0 []
239.216.0.72 EX v2 0 []
239.216.0.73 EX v2 0 []
239.216.0.74 EX v2 0 []
239.220.0.42 EX v2 0 []
239.220.0.43 EX v2 0 []

arista(config)#show ip mfib 239.211.4.99
Activity poll time: 60 seconds
239.211.4.99 172.216.0.11
Vlan400 (iif)
Activity 0:01:54 ago
239.211.4.99 172.216.0.25
Vlan400 (iif)
Activity 0:00:15 ago

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