ubuntu@maas19-node1:~$ sudo python3 ./add-juju-bridge.py --activate /etc/network/interfaces
ip link add name br-eth0 type bridge
ip link set br-eth0 up
ip link set eth0 master br-eth0
ip addr flush dev eth0
ip addr add dev br-eth0 10.11.19.110/24
ip addr add dev br-eth0 fe80::5054:ff:fe0c:1619/64
sleep 5
ip route replace default via 10.11.19.1  dev br-eth0
Done bridging eth0 with br-eth0


ip link add name br-eth1 type bridge
ip link set br-eth1 up
ip link set eth1 master br-eth1
ip addr flush dev eth1
ip addr add dev br-eth1 10.11.19.111/24
ip addr add dev br-eth1 fe80::5054:ff:fedb:75d6/64
sleep 5
Done bridging eth1 with br-eth1


ip link add name br-eth2 type bridge
ip link set br-eth2 up
ip link set eth2 master br-eth2
ip addr flush dev eth2
ip addr add dev br-eth2 10.11.19.113/24
ip addr add dev br-eth2 fe80::5054:ff:feab:9f65/64
sleep 5
Done bridging eth2 with br-eth2


ip link add name br-eth3 type bridge
ip link set br-eth3 up
ip link set eth3 master br-eth3
ip addr flush dev eth3
ip addr add dev br-eth3 10.11.19.112/24
ip addr add dev br-eth3 fe80::5054:ff:fe21:169c/64
sleep 5
Done bridging eth3 with br-eth3