Work-in-progress!

sudo docker-compose rm --force
#  --build
sudo docker-compose up --force-recreate --abort-on-container-exit --scale tofino_model=2

This is only a rough sketch on how to achive it:

1. Create n tofino-model + Stratum instances
2. Create the veth pair (stratumveth000 , stratumveth001) for every tofino-model port for the n instances.
3. Leave stratumveth000 in the "root" namespace in the host system, the other one stratumveth001 in the Docker container network namespace
4. Bridge the stratumveth001 inside container to veth0 (= the first port of tofino-model)

Now, the stratumveth000 in the root namespace is connected with veth0 inside the first tofino-model container!

sudo ./link_ports.py --verbose

Voilá, the first port of the tofino-model switch is linked from within the Docker container into a host "root" namespace veth named stratumveth000.

The stratumvethXXX interfaces are deleted after you stop the Docker containers.

This is a very nice explanation/guide-through of network namespaces, especially for Docker.