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This started bout 3 weeks ago in my Crestron Nome system.? ?I have posted a packet capture on OneDrive at this link:


All the traffic is originating from DM NVX 351C cards connected to the source devices.? The issue spans:

Traffic capture does not support that.

What switch are you using?

does video pass to the other endpoints that do not have matching firmware?

it's always been my experience with NVX to match all firmware (annoying but keeps everything working better).

A storm is most likely a bad registration or the switch not handling the registrations correctly.

What IGMP version is configured on the switch and the NVX's?

When the storm happens does it lock up everything?

What else is on the VLAN with the NVX's?

What processor and port are you using?

On Sat, Mar 12, 2022 at 05:39 PM, Crestron_Programmer_84 wrote:

What switch are you using?

cisco 9300 series

does video pass to the other endpoints that do not have matching firmware?

no problems what so ever

it's always been my experience with NVX to match all firmware (annoying but keeps everything working better).

A storm is most likely a bad registration or the switch not handling the registrations correctly.

What IGMP version is configured on the switch and the NVX's?

igmp 2 I believe

When the storm happens does it lock up everything?

takes out the whole network!

What else is on the VLAN with the NVX's?

Crestron home, theater equipment, Kaleidescape, Sony TVs, crestron cresnet to ip gateways. ?Wireshark only shows ?storm created by nvx’s configured as encoders.

What processor and port are you using?

CP4-R

Can you verify the Group registrations are working?

The command should look something like "show ip igmp snooping groups"
The output should show a group for each encoder and as the decoders subscribe to the stream, they will join a group.?

Also wondering, does this still happen even when no routes are made?

After looking through the wireshark I noticed a few more things.?

You mentioned different devices having different firmware, have you tested audio to make sure it is passing to all the endpoints? PTP is related to the AES67 audio stream.?

Further down it looks like the storm is less of a storm and more of a problem with IGMP Snooping and Querier. The multicast packets should not be hitting your PC/laptop that is capturing the packets.

To further help, are you willing to share the switch config?

Let me double check igmp config. ?If not I will be happy to share privately!

thank you!

Any idea why 2 min every 30 min?

I'm not sure yet. It could be a number of things.?

I know this is a long shot, but I just had a weird case where a devices on another VLAN was using IGMP v3 with PIM protocol (at least that is what an internet search said it was).? The devices were ATT Uverse boxes.? Somehow it was screwing up the IGMP v2 snooping on my VLAN and it took the whole network down -- both ATT and my stuff.? I had IGMP snooping disable on the port with the ATT IPTV -- actually I tried all types of combination of switch settings.? Somehow, these IGMP v3 packets totally screw up switch.? The switch itself only did IGMP v1 or v2.? It did not support IGMP v3.? In my case, it was not essential that I did IGMP snooping on this switch.? Disabling IGMP snooping solved the problem and everything started working okay.? Probably a firmware bug in the switch I am using where if it sees any IGMP v3 packets, it bombs out.? The only reason I had to do this in the first place was because two rooms had just one CAT5e each and I needed to put an access point and a ATT Uverse box in those rooms.? The ATT Uverse boxes only had Ethernet going to them.

If your CISCO switch supports this, try to enable "Storm Protection" on the IGMP Querier.? This fixed this problem on a job - same symptom, network goes down every few minutes.

A big shout out to Crestron_Programmer_84 for all his help!? The problem was resolved by turning off Spanning Tree Protocol the VLAN that is used for the NVX and other things being controlled.? ?Once I did that everything started to magically work.? ?Looks like I need to do some reading to understand the relationship between IGMP and STP.

Thank you to everyone for your suggestions.

Bryan