As of Traefik 1.3.8 and 1.4.0-RC2, Traefik provides official docker images for arm32v6 & arm64v8 ; also with Support manifest lists / manifest-tool in Docker, it's the same command whatever the processor you (amd64 or arm32v6 or arm64v8)
docker run -d -p 8080:8080 -p 80:80 -v $PWD/traefik.toml:/etc/traefik/traefik.toml traefik
Other ARM architectures may follow in the future, have a look at it !
Build an ARM docker container for Traefik based on Alpine
For eg:
docker run -d -p 8080:8080 -p 80:80 -p 443:443 -v $PWD/traefik.toml:/etc/traefik/traefik.toml hypriot/rpi-traefik
Read the Traefik documentation for more details.