We've got a site with all its Cisco SG300 network switches configured with a custom default VLAN.

Normally, we'd use the following commands to change the default VLAN:

vlan database
default-vlan vlan 11

That definitely worked in firmware v1.4.8.6, but the command is missing in firmware v2.5.0.83 and I've got no idea what the equivalent is in the new firmware.

  • Have you created that VLAN first? Note that the default VLAN is only reassigned to ports falling out of LAG and similar. I think you could really mean changing the native, untagged or access VLAN for all ports.
    – Zac67
    Feb 18, 2022 at 17:03
  • @Zac67, yes - the default VLAN would be the native VLAN that all ports on a switch will deafult to without any configuration overriding it. The default VLAN is also referenced in smartport configuration. Other switches on the network are setup with a default vlan of 11, and without being able to change that on the SG350, the switch will complain of a mismatched default VLAN... or maybe the message is actually referring to native VLAN, I'd have to check. Feb 20, 2022 at 0:08


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