DSA Mini-tutorial still marked as Work In Progress

[Luiz Angelo Daros de Luca]

> - Bridge device "br-vlan10" containing "lan1.10 lan2.10 lan3.10"
>   - VLAN filtering disabled


Bridging virtual 802.1q interfaces might fail in some scenarios, like
when you use vlan1 or mix tagged with untagged traffic
(https://github.com/openwrt/openwrt/issues/9066)
I do recommend bridge-vlan as the first option, although ip-bridge is
not installed by default.

I know that it is a little bit off topic but I would love some
transitioning code that could mimic swconfig devices as if they were
DSA. Instead of using swconfig settings for tagged vlans/isolated
ports, just create fake lan1, lan2, wan interfaces (802.1q) and derive
the swconfig settings from that. I've been doing that for some time,
creating switch_vlan configs from bridge+bridge-vlan and replacing the
user ports with the CPU port in every related bridge-vlan. This way I
can share the config with swconfig, DSA and even devices without
switches (VM like gns3) if I rename eth0, eth1, eth2 to lan1, wan,
lan2. The only downsides are that untagged bridging is done using
software bridge and the config is generated as a single-shot step
(uci-default). However, if that mapping is done inside netifd, I
believe it might be able to better handle those cases.

Regards,

Luiz