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Forum Discussion
M4200 -> M4300 Multicast Configuration (for NDI / Dante)
Hi all, 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... I have a M4200 with sever...
Thanks for the info... 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....
- Also, I though that with the IGMP proxy mode enabled, there actually isn't a querier elected?
- 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).
Hi,
To answer.
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.
2. Yes, by configuring all switches (and/or Routers) as IGMP proxy queriers, no designated IGMP querier is elected.
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.
I hope that helps answer your questions.
Hello,
Still following up here...
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.
I have a few questions regarding the M4300 Dante configuration guide.
- 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.
- 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?
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.
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.
1. The document follows the Dante specification, and only MLD Snooping should be enabled. It's not
necessary to enable MLD Querier.2. Correct that QoS would be a global setting for all ports, regardless of their respective VLAN
membership. In respect of Dante traffic, it's important to configure the respective IP DSCP queue
mapping, for example, IP DSCP 56 to Queue 6, etc.3. The IGMP Snooping Querier status by default is enabled as "Querier Election Participate Mode". If you
access the CLI Console, this can be seen by issuing the following command from the "enable" prompt:
"show igmpsnooping querier detail". When there are two routers in the same subnet then only one of them
should send query messages. The election ensures only one router becomes the active querier, ie., the
router with the lowest IP address would be elected as the IGMP Querier for that subnet. The Wireshark
trace should also show the IGMP Query interval, which I believe would be 125 secs. The CLI console
command "show ip igmp interface vlan 1" would confirm this.4. Not certain what may be the cause of the NDI video latency. I would recommend following the Dante
steps and also ensure the switch FW is updated to the latest version.Please let us know the status.
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