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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
exit

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.

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  • 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 ♦
    Commented 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.
    – Matty Brown
    Commented Feb 20, 2022 at 0:08

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