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Forum Discussion
IGMP Snooping and querier setup over multiple M4100, M4300, and GSM7328FS stacked
Trying to get multicast operating reliably over multiple switches and VLANS.
Most of the current multicast traffic is sACN, a DMX over ethernet protocol using multicast.
I find the setup instructions a little confusing, and would appreciate a detailed description on how to set this up on the my netgear hardware. Currently all of the test configs only partially work, and at times drop the multicast transmissions from various DMX nodes.
There dosen't seem to be any pattern as to which nodes loose the transmission.
Attached is a system diagram.
Thanks
Henry
1 Reply
Welcome to the community! :)
Every switch will need to have the following configuration on them:
1. IGMP Snooping enabled globally.
2. IGMP VLAN Configuration, each VLAN with Multicast needs to have admin mode enabled.
3. At least 1 switch needs to be configured for IGMP Snooping Querier. If having more make sure the core has the lowest IP Address assigned to it.
4. Enable IGMP Snooping Querier on each VLAN.Here are the notes to remember:
1. IGMP snooping without IGMP-Plus (this feature is only available on M4300/M4250 switches) will flood ALL multicast traffic between switches (sometimes even re-broadcasting back up to the original switch that sent the data). This can quickly saturate links.
2. Stacking doesn’t handle multicast traffic well.
3. Make sure Multicast traffic is distributed as much as possible not to have same MAC address. (32 Multicast addresses to each MAC address)
4. Make sure LAG Hash set to include DEST IP address (Hash modes 5/6/7) to allow for better balancing over LAG.Furthermore, if you REALLY wanted to do this right, you should swap to M4300 cores with M4250 switches replacing all the M4100 switches. It is costly, but more efficient and cleaner.
Regards,
DaneA
NETGEAR Community Team
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