IGMP snooping not working on access switches

dloeliger
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IGMP snooping not working on access switches

Hello,

 

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:

Group addressPortUsage
239.255.0.0/164321ATP Multicast Audio
239.69.0.0/165004AES67 Multicast Audio (RTP / AVP port)
223.0.0.233 8700-8706Dante Control 
224.0.1.129-132319, 320PTP
224.0.0.2515353mDNS
224.0.0.230 – 2338700 – 8708Multicast Control and Monitoring
239.16x.x.x ACN Yamaha
239.192.x.x-239.195.x.xSDT session, dyn. Based on IP and MAC Shure
239.254.1.19998Logging
239.254.3.39998PTP Logging (if enabled)
239.254.44.449998Logging
239.255.254.253 8427Multicast SLP Shure/Yamaha
239.255.255.250 1900SSDP, service discovery Shure
239.255.255.253 SLP multicast address Shure
239.255.255.2559875SAP (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.

 

Topology.png

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?

 

Thanks,

Daniel

 

 

 

 

 

 

5 REPLIES 5
cmr
Kind of a big deal
Kind of a big deal

@dloeliger are the old and new access switches all the same MS125 models?

cmr
Kind of a big deal
Kind of a big deal

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...

No, 24 and 48 ports models.

ww
Kind of a big deal
Kind of a big deal

IGMP snooping querier is enabled on each VLAN where needed.

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