IGMP snooping querier questions

[FordRacer]

Sorry if this is long winded, network audio is all new to me. I need to configure an IGMP snooping querier for multicast AES67 and Q-LAN traffic across my campus network.  There are several QSC cores spread throughout the network and some FlexIO devices connected to a variety of catalyst switches.

I have several questions.

Can there be only 1 querier on the network, or can there be one querier on each vlan?  All of my multicast traffic will be on 1 vlan.

When I initiate the command sho ip igmp snooping querier there is already a querier on a different vlan, I have never configured a querier on the network The IP address of the querier is an ip address that is not part of my network, and it is showing on a trunk port.  How can I find it?  On my layer 3 switch a sho run int vlan xxx of the vlan the querier says is not configured as the querier. Will I have to go to every switch and check the vlan configurations to find it?  I assume I will.

As far as configuring the querier on a Catalyst 3850, I have the VLAN configured - vlan 22 and a VLAN interface configured int vlan 22 with an IP address 192.168.66.1.  Can I use the VLAN 22 ip address of 192.168.66.1 as the snooping querier IP address when using the command ip igmp snooping querier address [IP address of the VLAN SVI].

Thank you for your help.

[Joseph W. Doherty]

If your doing multicast across L3 boundaries, the multicast router is the querier.

If not doing multicast routing, you only need a querier if switch(es) are doing IGMP snooping.

Normally, I recall, there should only be one querier per multicast (L2) domain.

[FordRacer]

Not crossing L3 boundaries, so just the one querier on the domain.

As far as configuring the querier can I just use the VLAN IP 192.168.66.1 as the querier IP address?  Or do I need to configure an IP on an interface as the SVI?

Sorry this multicast is all new.  Events team had a bunch of QSC gear for campus network audio installed I was told to make it work on the corporate network.

Thank you

[Joseph W. Doherty]

"VLAN IP 192.168.66.1"

Switch management IP?  If so, don't believe you can use it as a querier.  You'll need to define a SVI and enable the querier feature (or disable IGMP snooping).

[FordRacer]

I have a separate management VLAN. 

The VLAN IP of 192.168.66.1 is the IP address and gateway of the Network AV VLAN.

Thank you.

[paul driver]

Hello
If you need to route multicast between L3 subnets then youll require to have pim enabled, However to have lan multicast just within each vlan then enable igmp snooping querier on each L3 interface for the switch.

int vlan x
ip igmp snooping querier

[FordRacer]

Correct not routing multicast between L3 subnets.  All multicast is on the same subnet.

This seems like the simplest approach.

I now see devices that were not appearing before.

Now to tackle latency.

Thank you for your help.