When dealing with DSA on Linux the interface are named in following way (in my case on ARM64 platform - BPI-R64):
- wan
- lan1
- lan2
- lan3
- lan4
When I perform show interface in VyOS I'm seeing only:
vyos@vyos:~$ show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
br0 - u/D
br0.100 - u/D
eth0 - u/u
lan1 - u/u
lan2 - u/D
lan3 - u/D
lan4 - u/D
lo 127.0.0.1/8 u/u
::1/128
wlan0 - A/Dwan interface seems to be missing. I believe it should be visible also as an ethernet interface.