Follow these steps:

1. Create a new custom bridge with the name br0:

       $ docker network create br0 --subnet 192.168.2.1/24

2. Confirm that the network has been created:

       $ docker network ls

3. Start a container using the new network and make sure that it is using the correct subnet:

        $ docker container run -d --network br0 --name br0demo redis
        $ docker container inspect br0demo