Testing a kernel DT patch for the Turris Omnia router,

https://patchwork.kernel.org/patch/9495493/

I have found that `yast lan` shows only eth0, eth1, eth2 interfaces for
configuration, but not the individual port interfaces of the switch chip as
exposed by the kernel's dynamic switch architecture (dsa).

According to the above link, IP configuration or bridging should be done on the
lan0@eth1 level, not eth1, but those sub-interfaces are not offered in YaST.

It I manually create an ifcfg-lan0 config file, its settings are applied.