We are implementing a network for AV applications, like Dante audio over IP, NDI and lighting control.
Last year, we implemented the core part and 3 access switches and this year we added quite a bunch of access switches.
Before this year's extension, we had IGMP snooping enabled on the whole network and things worked fine - all multicast traffic was flowing as expected.
The following multicast groups are used for all devices to work properly:
ATP Multicast Audio
AES67 Multicast Audio (RTP / AVP port)
188.8.131.52 – 233
8700 – 8708
Multicast Control and Monitoring
SDT session, dyn. Based on IP and MAC Shure
PTP Logging (if enabled)
Multicast SLP Shure/Yamaha
SSDP, service discovery Shure
SLP multicast address Shure
SAP (AES67 discovery)
After adding the access switches this year, we have a problems with multicast traffic reaching them from other switches. Only on the NEW switches. They are all connected over a trunk LAGG to the core switches with the same admin VLAN and allow all VLANs.
So we had to limit IGMP snooping to the core switches to re-gain normal functionality. This is a problem for access points and 100Mbps devices, we can't leave the network in this situation.
Does someone know what can be a problem for multicast traffic on Meraki switches? All switches are MS425-32, MS125-24/48.
And how on earth this problem happens only on new switches?? Is there a hardware change?
And there are differences, the ms120-8p models we got a couple of months ago differ from the ones we received a year or so ago as the new ones experienced the PoE mis-location issue, but the old did not...