$ ./add-juju-bridge.py ~/eni2
iface eth0 inet manual
auto br-eth0
iface br-eth0 inet static
adns-nameservers 10.245.168.2
gateway 10.245.168.1
address 10.245.168.11/21
mtu 1500
bridge_ports eth0
iface eth1 inet manual
auto br-eth1
iface br-eth1 inet dhcp
mtu 1500
bridge_ports eth1
auto eth2
iface eth2 inet manual
mtu 1500
auto eth3
iface eth3 inet manual
mtu 1500
iface eth1.2667 inet manual
adns-nameservers 10.245.168.2
address 10.245.184.2/24
vlan-raw-device eth1
mtu 1500
vlan_id 2667
auto br-eth1.2667
iface br-eth1.2667 inet static
adns-nameservers 10.245.168.2
address 10.245.184.2/24
mtu 1500
bridge_ports eth1.2667
iface eth1.2668 inet manual
adns-nameservers 10.245.168.2
address 10.245.185.1/24
vlan-raw-device eth1
mtu 1500
vlan_id 2668
auto br-eth1.2668
iface br-eth1.2668 inet static
adns-nameservers 10.245.168.2
address 10.245.185.1/24
mtu 1500
bridge_ports eth1.2668
iface eth1.2669 inet manual
adns-nameservers 10.245.168.2
address 10.245.186.1/24
vlan-raw-device eth1
mtu 1500
vlan_id 2669
auto br-eth1.2669
iface br-eth1.2669 inet static
adns-nameservers 10.245.168.2
address 10.245.186.1/24
mtu 1500
bridge_ports eth1.2669
iface eth1.2670 inet manual
adns-nameservers 10.245.168.2
address 10.245.187.2/24
vlan-raw-device eth1
mtu 1500
vlan_id 2670
auto br-eth1.2670
iface br-eth1.2670 inet static
adns-nameservers 10.245.168.2
address 10.245.187.2/24
mtu 1500
bridge_ports eth1.2670
dns-nameservers 10.245.168.2
dns-search dellstack