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CheapJeep's avatar
CheapJeep
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Oct 01, 2025

M4300/M4250 - Keeping multicast on switch

I have several M4300 / M4250 switches set up for a customer with various Crestron NVX implementations, all of which is working well.

 

We have a very basic connection to the customer's existing network by simply connecting a standard gigabit port on the M4300/4250 (port 48) to one of their switches, used only for remote access and diagnostics. We are not directly trunked to their switches or stacks, in effect we appear as a simple unmanaged switch to their equipment (BPDU filter, disabling STP on that port - I know, I know, not good things to do, and will ultimately be resolved properly).

 

We want to make sure multicast does not leave our dedicated M4300/4250 switch, and block all multicast traffic from leaving (or entering) port 48. In effect, I want to make sure all multicast is blocked inbound and outbound on that single switch port, but allow other TCP/IP traffic for remote diagnostics, etc.

 

I've tried using the Configure>Multicast -> Block Multicast method in the AV GUI webpage:

 

But I still see multicast traffic entering and leaving the switch on port 48:

 

Does anyone have any suggestion on ensuring that all multicast traffic (even if it's by IP/range) stays on the switch and does not traverse my "uplink" port 48?

 

Thanks

 

Jay

 

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