Why does the CPU needs to be "informed" about the vlan traffic?

Installing and Using OpenWrt Network and Wireless Configuration
1

Hello,

I'm using an Ubiquiti UniFi AC Pro with OpenWrt 24.10.0 r28427. It offers several wlans, which are connected to several vlans.

In order to make this work I had to include eth0 tagged into each vlan. I'm not sure, if this the best way to do it.

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Why does the CPU needs to be "informed" about the vlan traffic?

kind regards
Jens

2

This is because the WiFi radios are not connected to the switch itself. That means the system must create a bridge (effectively a switch in software). So the cpu must be aware of the vlan order to bridge it to the radio hardware.

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3

Thank you very much.