[FS#4087] Cannot use vlan 1 tagged with DSA in WRT1900ACS v2

[OpenWrt Bugs]

THIS IS AN AUTOMATED MESSAGE, DO NOT REPLY.

A new Flyspray task has been opened.  Details are below. 

User who did this - Luiz Angelo Daros de Luca (luizluca) 

Attached to Project - OpenWrt/LEDE Project
Summary - Cannot use vlan 1 tagged with DSA in WRT1900ACS v2
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Hello,

No matter what I change, I cannot create a wan.1 interface. Any other vlan id works:

config device
        option name 'br-lan'
        option type 'bridge'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'
        list ports 'lan4'

config interface 'lan'
        option device 'br-lan'
        option proto 'static'
        option netmask '255.255.255.0'
        option ip6assign '60'
        option ipaddr '192.168.1.4'
        option gateway '192.168.1.1'

config interface 'lan6'
        option proto 'dhcpv6'
        option device 'br-lan'
        option reqaddress 'try'
        option reqprefix 'auto'

config device
        option name 'br-guest'
        option type 'bridge'
        list ports 'wan.3'

config interface 'guest'
        option proto 'none'
        option device 'br-guest'

config device
        option type '8021q'
        option ifname 'wan'
        option vid '3'
        option name 'wan.3'

config device
        option type '8021q'
        option ifname 'wan'
        option vid '2'
        option name 'wan.2'

config interface 'test'
        option proto 'none'
        option device 'wan.1'

config device
        option type '8021q'
        option ifname 'wan'
        option vid '1'
        option name 'wan.1'

I want to add wan.1 to br-lan but the virtual device (wan.1) is never created. I created a test interface just to try to bring it up alone, but nothing made wan.1 appears.

I also tried ip-full and it also failed:

root at ap4:/etc/config# ip link add link wan name wan.1 type vlan id 2
root at ap4:/etc/config# ip link add link wan name wan.1 type vlan id 1
RTNETLINK answers: Not supported

Why vlan 1 is prohibit?

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4087

You are receiving this message because you have requested it from the Flyspray bugtracking system.  If you did not expect this message or don't want to receive mails in future, you can change your notification settings at the URL shown above.