For the past week, I've been trying to configure VLANs on my brand new Cudy WR3000 OpenWRT router. But whenever I try to apply the settings in the screenshot, I lose connection to my router and the revert timer saves my ass. I'm connected via ethernet to lan port 3 (as visible in the screenshot). I haven't changed anything else to the settings, so 192.168.1.0/24 is still the management subnet (and also the only subnet for that matter). Whenever I lose the connection to the router, all the LEDs keep flickering like they normally do, so I don't think the router is crashing. I've tried extending the revert timer up to 5 minutes, in case the long restarting would be a problem. I've tried setting a static IP address in case DHCP would be the culprit. I tried enabling 'Bring up empty bridge' for br-lan, but that also did nothing. After a lot of debugging, I'm out of options. I hope any of you can point me in the right direction. Thanks in advance!
After setting the VLAN configuration, only use the Save, not the Save & Apply button in the Devices tab. Then go to the Interfaces tab and edit the lan interface by changing its device from br-lan to br-lan.1 (to specify the VLAN ID using the dot notation).
Once you have done this, click on Save & Apply.
This did indeed resolve the issue. Thank you very much! I apologize for my foolish mistake.
It's better not to use VLAN 1, different managed switches have somewhat strange behaviours with VLAN 1.
I had to learn the hard way.
Yes. That's a good advice.
Just as a reminder for all. Vlan id are 2^12 bit, 4096.
Some of them are reserved but most of the lower bits are save to use besides the issue that some devices do funky stuff if they see a tagged vlan 1 