NetworkPro:
Similar thing happened when I touched a QinQ VLAN that is under a normal VLAN. I tried to change the QinQ (service tag) vlan id from 1 to 111 and router was !@#$ed. I managed to get in somehow through one of the interfaces and issue a restart after which the QinQ tag was still 1 and I just changed it to 111 and all is fine since then.
There is a PPPoE server on the normal VLAN and one on the QinQ vlan as well.
This is a x86 P4 3.0GHz with HT, with RPS off and with IRQs as “auto” assigned. The VLANs are on an Intel PRO/1000.
Just tried removing the QinQ VLAN with service tag by hitting the “minus” button in WinBox. Router became unstable and a reboot was needed. This is definitely a bug.