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Forum Discussion
Multicast traffic only goes in one direction (need to send multi cast back)
We have a igmp layer 2 network for multicast video traffic. I am able to join multicast traffic in "one direction" Source A and TV A ---> M5300-52G3 --> LAG --> GS752TS --> Source B and TV B ...
Hi krobinson,
Welcome to the community! 
Could you please check whether enable IGMP Snooping in the VLAN or Interface both for TV A and TV B.
As Switch will generate MFDB table and IGMP Group entities only when enable IGMP Snooping in the VLAN or Interface.
Hope it helps!
Regards,
EricZ
NETGEAR employee
Yes, IGMP snooping is enabled on all ports including the LAG.
When I have querier enabled on both switches the M5300-52G3 enables "Multicast Router" (under the IGMP Snooping Section) on the LAG. This sends ALL the video down the lag (over 4gigs of data). I will get video breakup in this situration.
I do notice that if I disable querier GS752TS and have TV B connect to a mulitcast from Source B, then TV A is able to connect to the same multicast but nothing else.
How is MLD snooping different than IGMP snoopping?
Hi krobinson,
MLD Snooping function behavior is same as IGMP Snooping, just for IPv6/IPv4 protocol.
Could you please provide configuration file to us for further analysis?
How do I send configure files from my Managed Switch to NETGEAR community moderators?
http://kb.netgear.com/app/answers/detail/a_id/3143
9 Hi krobinson,
We have got the configuration for two switches. Looks like the IGMP configuration is same on two switches, so the behavior should be same.
Now we have some suggestion for the IGMP configuration:
1. You can enable IGMP Snooping in desired VLAN, no need enable in all VLANs.----I notice on M5300 switch, IGMP Snooping enable on all of VLANs(1/3/20~30/300);
2. We not suggest enable IGMP Snooping for VLAN and ports at the same time. In other words, no need enable IGMP Snooping in all port if it's enabled in VLAN.
3. Could you reload switch and try again after you modify the configuration as above?
Regards,
EricZ
NETGEAR employee
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