using "systemctl restart networking", Bridge interface disappeared

[mgrsc]

After using "systemctl restart networking", my internal virtual machine cannot access the Internet. I checked the bridge and found that after restarting, the interfaces connected to the bridge would disconnect, with no errors in the logs. What could be causing this issue and how can I resolve it?
pve:~# brctl show
bridge name bridge id STP enabled interfaces
fwbr101i0 8000.aac41482536a no fwln101i0
tap101i0
fwbr103i0 8000.be457259342b no fwln103i0
tap103i0
fwbr106i0 8000.c2c47d4cd54d no fwln106i0
tap106i0
fwbr107i0 8000.96654ecedb23 no fwln107i0
tap107i0
fwbr400i0 8000.d64e2e183be5 no fwln400i0
veth400i0
vmbr0 8000.00e04c06a411 no enp1s0
fwpr101p0
fwpr103p0
fwpr106p0
fwpr107p0
tap100i0
vmbr1 8000.00e04c06a412 yes enp3s0
fwpr400p0

pve:~# brctl show
bridge name bridge id STP enabled interfaces
fwbr101i0 8000.aac41482536a no fwln101i0
tap101i0
fwbr103i0 8000.be457259342b no fwln103i0
tap103i0
fwbr106i0 8000.c2c47d4cd54d no fwln106i0
tap106i0
fwbr107i0 8000.96654ecedb23 no fwln107i0
tap107i0
fwbr400i0 8000.d64e2e183be5 no fwln400i0
veth400i0
vmbr0 8000.00e04c06a411 no enp1s0
vmbr1 8000.00e04c06a412 no enp3s0

 

[Stoiko Ivanov]

The association of bridge-ports to brigdes used to get lost upon `systemctl restart networking`, which is why Proxmox VE recommends ifupdown2, where you can use `ifreload` (this is also what is exposed on the GUI for reconfiguring the network.

I hope this helps!