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Stack of 4300 Switches mDNS fails, Dante fails
We bulit a stack of 3 switches, M4300-48X, M4300-28G-PoE+ and M4300-24X.
All normal traffic and protocols are running well.
Only Dante Controller shows no units in the complete network.
Wireshark tells us that PTP and Dante communication is running smooth, only mDNS does not work,
eg Dante Controller is empty.
If we connect the Dante Devices to M4300 which are not stacked everything works perfect as described here.
https://kb.netgear.com/000060205/M4300-Configuration-Guide-for-Dante-Audio-Devices
We built a stack because we need to run on the same infrastructure also SDVoE traffic,
as mentioned here https://kb.netgear.com/000058812/Should-I-use-stacking-or-link-aggregation-LACP-on-M4300-Series-Managed-Switches-with-SDVoE-traffic
Firmware version 12.0.7.10.
Any help would be greatly appreciated
Hi Laurent
We could get Dante finally to work by:- Setting Bonjour to enable and wait for a long time or reboot the complete stack. Disabling Bonjour
does drop ALL Bonjour traffic on the complete stack, not just disable the visibility of the switch itself on browse - Using IGMP in version 2 instead of version 3 suggested by Dante
- Ignore the QOS DSCP settings from the Howto and leave QOS on default settings "trustdot1p"
Support has pending tasks now:
- Fixing Bonjour
- Figuring out correct DSCP settings
- Analyze why IGMP version 3 is not working correct.
Many thanks for your help and from all support staff
thesnake
- Setting Bonjour to enable and wait for a long time or reboot the complete stack. Disabling Bonjour
5 Replies
Hi thesnake
Thank you for your message and sorry about your issue. There is something we need to fix in your installation as Dante and its Local Multicast (Bonjour) mDNS packets are meant to work well across a stack of M4300 switches. You are spot on with the reference to our Dante application note as well as our general guidance on M4300 Stacking benefits. So, this is on us!
Please log into your M4300 stack when you see the issue (empty Dante Controller) and export the "Tech-Support File". To do so, you can use the Web GUI, go to Maintenance \ Export \ HTTP File Export and select Tech Support in the dropdown list:
Please send this file to me using Private Message (you can go through it on your side, this is a collection of show commands and other troubleshooting commands that are used to detect the root cause of an issue). The Tech Support and Engineering teams will work on your file asap and I will come back here to report on it. Thanks in advance for forwarding this file to me. If you can, please indicate in your private message where is the Dante Controller (which switch unit in the stack, which physical interface - port number) as well as a few Dante devices. It will help narrow the search. Right now we can already anticipate the mDNS packets are conflicting somewhere in between.
Regards,
Thanks for your answer, PM is sent. Thanks
Hi thesnake
Thank you for having provided your Tech-Support file to us, I know the Tech Support team came back to you.
Checking in with you to confirm: was the problem solved after you enabled Bonjour in the M4300 switch stack? The Dante mDNS packets aren't blocked anymore, is that right?
We will make the KB clearer here: https://kb.netgear.com/000060205/M4300-Configuration-Guide-for-Dante-Audio-Devices
We used to disable Bonjour on 12.0.7.9 firmware (or older) to ensure the forwarding of Dante mDNS packets. We were resolving a conflict this way, with M4300's own implementation of Bonjour discovery in the network. But we fixed this issue starting 12.0.7.10 and now, by design, we don't need to disable Bonjour anymore.
Bonjour is now enabled by default in M4300 software, no conflict with other Bonjour packets. I believe you run 12.0.7.12 on your stack, please let us know how it goes in your Dante Controller now?
Many thanks,
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