@Pedza Thank you for posting how you think the switch is set, but could you also describe what the issue is (more detail than "it doesn't work") and how the switch is actually set (port and VLAN specific information, screenshots of the GUI or CLI output help best).  Also are you using the switch in standalone or with Omada?

  @JoeSea Thank you for reply!

1. The trouble with VLAN 51 is that we cannot acces (even ping!) devices connected to switch. They all have static IPs. All other devices connected to ports in other VLANs are accessible.

2. Switch is used standalone

3. Screenshots are provided:

  @Pedza The System-VLAN is spanning all ports, is there a reason for this, is it as a tagged or untagged VLAN on ports 1-22?  In this arrangement all ports are currently trunked (except Port 23), or have two VLANs that are untagged on the port.

Where are you pinging VLAN 51 from, and are there ACLs on the switch or router that would be blocking the ping return (not all ACLs are stateful)?

An additional thing I see, Ports 15,16 have a PVID of 51 but are not in the setup for tagging, probably not related, just noticing it.

  @JoeSea Sorry for this late reply - I was out of office (got fiver).

System-VLAN is something we inherited form ex admin and we did not change it - thre are 13 switches there, factory is working 24x7 so we did not have time frame for such a operation.

Anyway, even with System-VLAN spanning all ports, there is no problem with VLANs 41 and 61, just with VLAN 51 - that is strange.

We will try to update firmware on this switch - so my question is: In System Summary I see that hardware version is: TL-SG3428MP 5.0 and actual firmware version is: 5.0.0 Build 20220301 Rel.54959.

When I search for updates on TP-Link site I have options: v5, v5.2, v5.6,v5.26 - looks like I should go for v5 but i am not sure... Please correct me if I'm wrong.

Best regards,

Pedja