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How to keep a VLAN in an "UP/UP" state with no clients or hosts connected in that VLAN
This status might be required when using Layer 3 (L3) routing.
Normally, to maintain a VLAN in up/up state on a switch, you need to have at least one physical device connected in that VLAN. Otherwise, the VLAN has an up/down state. Currently, there is no command to put a VLAN interface up/up when there are no active ports in the switch for that VLAN.
If you do not want to connect a device, connect a loopback plug in any port for that VLAN. As an alternative, try a crossover cable that connects two ports in that VLAN on the same switch. This method forces the port up.