Comment 41 for bug 2022030

Hi,

Did some more test, I changed the network daemon from systemd-networkd to NetworkManager (still use netplan), the 'vlan interface lost after reboot' still there: reboot the os will lost the vlan interface, restart the NM service could shows up the vlan interface. In the NM log, it shows during the boot stage: manager: "(netplan-enc1000.1292) couldn't create the device: no support for VLANs on interface enc1000 of type Ethernet"

Here are some networkmanager service command output before and after 'restart nm service' as the comparison, and journalctl log file with operate timestamps:
>>>>>>>>>>>
journalctl -u NetworkManager > nm.log

timestamp: Jul 27 08:27 -> reboot the ubut os

timestamp: Jul 27 08:32 -> restart the nm service
>>>>>>>>>>>>

>>>>>>>>>>>>>>>>>>>
run 'nmcli d' and 'nmcli c' before and after 'restart nm'

> before NM restart

ubuntu@a90ubut15:~$ nmcli d
DEVICE TYPE STATE CONNECTION
enc1000 ethernet connected netplan-enc1000
lo loopback connected (externally) lo

ubuntu@a90ubut15:~$ nmcli c
NAME UUID TYPE DEVICE
lo 2f1c6dd9-26ca-4276-a210-8bf61256322a loopback lo
netplan-enc1000 20393913-b9a9-3c3a-81cb-20f5840b309b ethernet enc1000
netplan-enc1000.1292 491497ea-36cb-3b96-ad99-6519b363483d vlan --

> after restart NM

ubuntu@a90ubut15:~$ nmcli d
DEVICE TYPE STATE CONNECTION
enc1000.1292 vlan connected netplan-enc1000.1292
enc1000 ethernet connected netplan-enc1000
lo loopback connected (externally) lo

ubuntu@a90ubut15:~$ nmcli c
NAME UUID TYPE DEVICE
netplan-enc1000.1292 491497ea-36cb-3b96-ad99-6519b363483d vlan enc1000.1292
lo 2f1c6dd9-26ca-4276-a210-8bf61256322a loopback lo
netplan-enc1000 20393913-b9a9-3c3a-81cb-20f5840b309b ethernet enc1000
>>>>>>>>>>>>>>>>>>>>>>>>>

>>>>>>>>>>>>>>>>>>>>>>>>>>
I also compared the output of 'nmcli c show netplan-enc1000.1292' command before and after 'restart nm', found that the output of 'after the restart nm' not only include all the parameters in 'before the restart nm', and also plus the following parameters:

GENERAL.NAME: netplan-enc1000.1292
GENERAL.UUID: 491497ea-36cb-3b96-ad99-6519b363483d
GENERAL.DEVICES: enc1000.1292
GENERAL.IP-IFACE: enc1000.1292
GENERAL.STATE: activated
GENERAL.DEFAULT: yes
GENERAL.DEFAULT6: no
GENERAL.SPEC-OBJECT: --
GENERAL.VPN: no
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/ActiveConnection/3
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/Settings/2
GENERAL.ZONE: --
GENERAL.MASTER-PATH: --
IP4.ADDRESS[1]: 10.20.92.201/24
IP4.GATEWAY: 10.20.92.254
IP4.ROUTE[1]: dst = 10.20.92.0/24, nh = 0.0.0.0, mt = 400
IP4.ROUTE[2]: dst = 0.0.0.0/0, nh = 10.20.92.254, mt = 400
IP4.DNS[1]: 10.20.0.2
IP6.ADDRESS[1]: fe80::ca:72ff:fe80:acb0/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 256
>>>>>>>>>>>>>>>>>>>>>>>>>>

Thanks.