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Forum Discussion
M4300 Broadcasting Multicast Traffic
I’m trying to configure an M4300 switch hosting multiple VLANs carrying multicast traffic. I need to create two types of ports: some that use IGMP, and some that broadcast all multicast traffic from specific VLANs without receiving IGMP join messages.
What’s the correct way to do this?
I found another forum post [1] that mentions defining the port as an Mrouter interface and using the “Exclude Mrouter Interface Mode” option, but the manual is confusing.
On page 246 of the M4300 User Manual dated April 2022 [2], which is in the section:
Chapter 4: Configuring Switching Information -> Manage Multicast -> Configure IGMP Snooping for VLANs Manually. It describes the following:
“
Exclude Mrouter Interface Mode. From the menu, select to enable or disable the Exclude Mrouter Interface Mode. This selection specifies the type of information that is forwarded to the upstream multicast router interface.
If enabled, the VLAN forwards IGMP Join/Leave PDUs that it receives on a downstream port to an upstream mrouter interface. In addition, the VLAN forwards a multicast data stream to an upstream mrouter interface only if that port already received an IGMPv1 or IGMPv2 membership message. The VLAN drops unknown multicast streams. The default is Enable.
If disabled, the VLAN forwards IGMP Join/Leave PDUs, known multicast streams, and unknown multicast streams to the upstream mrouter interface.
“
That seems the opposite of what I’d expect - enabling the option seems to “include Mrouter interfaces” in IGMP Snooping. How should I interpret this option?
Thank you for your help.
[1] The forum post:
[2] Netgear M4300-48XF (XSM4348FS) manu
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