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Troubleshooting Question

VLAN segmentation

tmaususer asked
Last Modified: 2020-12-02
We are a manufacturer, so we have PLCs that do much multicasting.  Sometimes a PLC message doesn't get to a computer or database in time.  I believe we are having timeouts.  
I have many VLANs for different hardware or usage types, but I don't think they are segmenting the traffic the way I thought they should.  For instance, if I put wireshark on a computer, I can see conversations on other vlans.  I think in ignorance, I have just been making VLANs without making routing rules.  We have a core stack of Cisco 3850 Layer 3 switches.  Can I make the type of rules I need to to separate VLAN traffic so that the network can send packets in a timely fashion?
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