I have created VLAN-s on a bond and then created a bridge in linux onto those vlans

```
neutron_plugin_agent: "ovn"
neutron_external_interface: "bond1.100,bond1.101,bond1.102,bond1.15,bond1.18,bond1.4,bond1.51,bond1.8,bond1.96,bond1.97,bond1.98,bond1.99"
neutron_bridge_name: "br-ex100,br-ex101,br-ex102,br-ex15,br-ex18,br-ex4,br-ex51,br-ex8,br-ex96,br-ex97,br-ex98,br-ex99"
```

So the linux underneath is doing the vlan tagging and physicial switch is set to trunk mode on the bond1 ports, with the specified VLAN-s in an allowlist
the ml2 conf is like this

```
[ml2_type_flat]
flat_networks = physnet100,physnet101,physnet102,physnet15,physnet18,physnet4,physnet51,physnet8,physnet96,physnet97,physnet98,physnet99
```