M4200 - M4300 Multicast Configuration (for NDI / Dante)

Question

Hi all,&nbsp;I am not having any problems currently, but I wanted to run the config by this group and see if there's anything I'm missing or if any tweaks are in order...&nbsp;I have a M4200 with several NDI devices connected. Currently, port 10 is uplinked to port 25 on the M4300, which will serve as the main switch.&nbsp;&nbsp;I haven't created any additional VLANs, so everything is operating on VLAN1. As far as I can tell, I have querier enabled on only the M4300, snooping enabled on both switches, and the querier address is 1.1.1.1 on the M4300 for highest priority, and 2.2.2.2 on the M4200. I also have Fast Leave enabled but the detail below doesn't show this (what show command would report this?) Is this all correct?&nbsp;This is for the M4300:(M4300-28G) #show igmpsnooping querier detail
        Last Querier     Querier                 
VLAN ID Address          MAC Address        IGMP Version
------- ---------------- ----------------- ------------

Global IGMP Snooping querier status
-----------------------------------
IGMP Snooping Querier Mode..................... Enable
Querier Address................................ 0.0.0.0
IGMP Version................................... 2
Querier Query Interval......................... 60
Querier Expiry Interval........................ 60

VLAN 1   :   IGMP Snooping querier status
----------------------------------------------
IGMP Snooping Querier VLAN Mode................ Enable
Querier Election Participate Mode.............. Enable
Querier VLAN Address........................... 1.1.1.1
Operational State.............................. Querier
Querier MAC Address............................ bc:a5:11:16:82:cb
Operational version............................ 2
Operational Max Resp Time...................... 10This is the M4200:(M4200-10MG-PoE+) #show igmpsnooping querier detail

Last Querier
VLAN ID Address          IGMP Version
------- ---------------- ------------
1       10.101.1.107     v2

Global IGMP Snooping querier status
-----------------------------------
IGMP Snooping Querier Mode..................... Disable
Querier Address................................ 0.0.0.0
IGMP Version................................... 2
Querier Query Interval......................... 60
Querier Expiry Interval........................ 60

VLAN 1   :   IGMP Snooping querier status
----------------------------------------------
IGMP Snooping Querier VLAN Mode................ Enable
Querier Election Participate Mode.............. Enable
Querier VLAN Address........................... 2.2.2.2
Operational State.............................. Disabled
Last Querier Address........................... 10.101.1.107
Operational version............................ 2
Operational Max Resp Time...................... 11Finally,&nbsp;&nbsp;I haven't gotten to it yet, but I will be adding maybe 3-4 Dante devices to this network. Is there a compelling need or reason to separate this into a different VLAN? Or, can I configure QoS as I normally would for Dante on VLAN 1 and not negatively affect the NDI traffic?&nbsp;Thanks!&nbsp;&nbsp;

NeilS · Answer

Hi...
&nbsp;
Using 1.1.1.1 and 2.2.2.2 as querier addresses are not a concern as the addresses can be anything you wish, ie., they are not actual IP adreses, but used as part of an election process. Since there can only be a single querier active in the network, and if (as in your case), multiple queriers are configured, this can trigger an election process. The current active querier will be the switch with the lowest address configured in the querier field.
&nbsp;
The M4300 is the primary querier, so in the event of any M4300 downtime, the M4200 would then become the primary IGMP querier, etc.
&nbsp;
In order to view Fast-Leave information, the following commands can be used for example:
#show igmpsnooping 1#show igmpsnooping fast-leave (at port level)
&nbsp;
Regarding running Dante and NDI devices on the same VLAN, the best practice recommendation would be to create a seperate VLAN for the Dante devices.
&nbsp;
There is a kb available for this available at: https://kb.netgear.com/000060205/M4300-Configuration-Guide-for-Dante-Audio-Devices
&nbsp;
Please let us know if you have any further questions.

muzicman82 · Answer

Thanks for the info...&nbsp; a few follow up questions:Am I correct to leave IGMP Snooping Querier Mode to Disable for the M4200 (but enabled on the M4300)? This does give me exactly one querier. I thought there should not be more than one querier on a network, or is that recommendation just for simplicity of not having to properly set up election priorities? I mean, in this sort of environment, if the querier is down, the switch is down and I have more problems....&nbsp;Also, I though that with the IGMP proxy mode enabled, there actually isn't a querier elected?&nbsp;One recommendation for NDI is to disable QoS? How is that done on these switches, and if I were to setup a VLAN for Dante, I'd need to disable for NDI VLAN and configure QoS for Dante VLAN (I've done this before).&nbsp;

NeilS · Answer

Hi,
&nbsp;
To answer.
&nbsp;
1. Practicality suggests having more than one querier in the event of any failures on the network.
So can make sense to have both switches enabled as querier, but each with higher/lower IP values in the event of an election process.
&nbsp;
2. Yes, by configuring all switches (and/or Routers) as IGMP proxy queriers, no designated IGMP querier is elected.
&nbsp;
3. QoS isn't enabled by default on either switch model, so no need to specifically disable for NDI devices.
QoS can then be enabled for all Dante devices on the new VLAN.
&nbsp;
I hope that helps answer your questions.
&nbsp;

muzicman82 · Answer

Hello,&nbsp;Still following up here...&nbsp;I went ahead and configured VLAN 2 to contain only Dante audio devices. I don't expect to need or setup multicast flows, but I have IGMP querier and snooping enabled on this VLAN as well.&nbsp;&nbsp;I have a few questions regarding the M4300 Dante configuration guide.&nbsp;I see where MLD Snooping is enabled for the Dante VLAN in the guide. However, MLD Querier is not enabled. Should it be? Is MLD configured the same way as IGMP? I realize it handles IPv6.&nbsp;I do not see in the M4300 where QoS is "disabled" by default. I see it is set to trust-ip-dscp, or is that effectively "disabled" since it is relying on devices to set the flags?I am a little lost on how QoS is configured differently for different VLANs, or is it not? Should I follow the steps in the guide and configure the switch QoS settings for Dante even though VLAN 1 will be for management and NDI video? I also realize that the QoS is now being advised for networks with a lot of devices/bandwidth... which I will not have, so is it necessary?&nbsp;Lastly, I have IGMP Querier enabled on all switches as advised, but in Wireshark, I still see Membership Query messages from both switches. It is less often than the primary switch sends them out. When I check the "2.2.2.2" switch (which should be the backup querier), it does say the Querier status is Non-Querier. So, I guess I am wondering if seeing Membership Queries from both switches is normal or if I should disable the querier on the non-primary switch.&nbsp;

muzicman82 · Answer

Also, I'm getting between 167-235ms in NDI video latency. Is it possible that the switch is adding some of this latency? I did change one NDI camera to unicast and it did not affect the video latency.&nbsp;

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M4200 -> M4300 Multicast Configuration (for NDI / Dante)

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