---
systemd_link__links:
  isp0: 02:00:00:6a:3e:f4

ifupdown2__interfaces:
  isp0:
    addresses:
      - 2a09:6840:210::1:3/64
      - 10.210.1.3/16
    gateways: "{{ ifupdown2__gateways.isp }}"
...