Solved! It was the endpoint and not the switch. Thanks for all the help folks!

​

​

​

Let me start by saying I know this is not a typical setup and for many reasons shouldn't be done, but yanno the customer is always right.

I have been tasked with creating a way that a server on vlan 1, end devices on vlan 3, and more end devices on vlan 4 can all talk to each other. All traffic, ip and udp including broadcast, needs to flow freely between all 3 vlans.

putting it all one a single VLAN is our normal procedure.

We're using a single catalyst 9300 with the above vlans defined.

I've google around a good bit and tried a lot of things.

Sanitized config posted here https://pastebin.com/FbVdCVzQ

​

If you folks can offer any advice it would be greatly appreciated.

​

edited because I'm scattered brained and didn't finsh the sentences...