LAN wizard VLAN changes rewrite trunk port PVID, causing mgt loss
I've experienced three separate outages on my SG3428MP (hardware v6.20, firmware 6.20.20) caused by what appears to be the same bug fixed in firmware 6.30.1: "Fix the issue of IP loss caused by repeated modification of VLAN configuration by the controller."
Reproduction steps:
- Switch is adopted in Omada controller (v6.1.0.19), trunk uplink port configured with PVID=1 and tagged VLANs 10/100/152/153
- Use the Omada LAN network wizard (Network Config > LAN > Edit network) to add or remove a VLAN from any network
- The wizard rewrites the PVID on the trunk uplink port, stripping tagged VLANs from the allowed list
- Result: switch loses management connectivity, all APs drop off controller, WiFi stops passing traffic
Recovery required each time: serial console access (minicom at 38400 baud), manually re-adding the stripped VLANs via CLI, then reboot.
Observed three times: 21 Mar 2026, 22 Mar 2026, and 5 May 2026. The third incident also resulted in credential loss requiring boot menu password recovery and full switch re-adoption.
Workaround: avoid the LAN network wizard entirely; use switch port profiles instead.
I note that firmware 6.30.1 for the 6.30 hardware revision includes a bug fix that matches this behavior exactly. That fix does not appear in 6.20.22 (the current release for 6.20 hardware).
Could you confirm whether this is the same root cause, and whether a backport to the 6.20 firmware branch is planned?
Environment:
- Switch: SG3428MP hardware v6.20, firmware 6.20.20 Build 20260113
- Controller: Omada Software Controller v6.1.0.19 (Linux)
- Confirmed reproducible via LAN wizard in both "add VLAN" and "remove VLAN" operations
