ISP CZ O2 optical PPPOE config

Hi, I want share to configration for PPPoE in CZ O2 provider (optical) (so far there are intructions for VSDL and IPTV only OpenWrt configuration for different ISP)
Key parts of the network configuration file:

config interface 'wan'
	option device 'eth0.848'
	option proto 'pppoe'
	option username 'O2'
	option password 'O2'
	option ipv6 'auto'
	option norelease '1'
config switch_vlan
	option device 'switch0'
	option vlan '2'
	option ports '0t 1t'
	option vid '848'

It is swconfig I suppose?
Helps untagging "wan" on cpu port along adjusting ppp device configuration.

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This is good to know, however it only applies to swconfig routers. DSA would be different.

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Adding screenshot of Wan interface, "LUCI approach" equals config file changes