IGMP snooping not working on access switches

dloeliger
Comes here often

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

 

 

 

 

 

 

7 Replies 7
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...

dloeliger
Comes here often

No, 24 and 48 ports models.

ww
Kind of a big deal
Kind of a big deal
dloeliger
Comes here often

IGMP snooping querier is enabled on each VLAN where needed.

ofelipe
New here

@dloeliger Sorry to revive this topic, but I'm having problems very similar to the MS120, the igmp traffic apparently doesn't flow in the LAGG between the switches, were you able to resolve this somehow?
I'm also using this for Dante, I don't know if it was a good idea lol

dloeliger
Comes here often

@ofelipe So we we found one problem, we had to unstack the core switches to have multicast work fine with igmp snooping enabled. Maybe even brake lagg also (but no more abolutely sûre about this point).

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