Linux Debian. How to start vlan associated with Open vSwitch?

Question

linux

There is a server on Debian. There is some kind of wi-fi portal .. xs to be honest.
In general, after rebooting the server, access to ip 10.21.126.59 was lost, the interface is called vlan100. It's also somehow related to Open vSwitch, I don't understand it, to be honest.

Before the server was rebooted, the vlan100 interface was displayed when using the ifconfig.
After a reboot it is gone.
But in the interface settings it is registered /etc/network/interfaces:


I'm trying to raise it with a team ifup vlan100, an error comes out: I


don't know what to do at all, help plz))

here's the story, people set it all up a year ago and disappeared: