---
systemd_link__links:
  isp0: 04:00:00:29:6d:c9

ifupdown2__interfaces:
  isp0:
    addresses:
      - 2a09:6840:210::1:4/64
      - 10.210.1.4/16
    gateways: "{{ ifupdown2__gateways.isp }}"
...