dummy_interface.yml

- name: init vars
  set_fact:
    dummy_interface_commands: []
- name: add delete command
  set_fact:
    dummy_interface_commands: '{{ dummy_interface_commands }} + ["delete interfaces dummy {{ item.key }}"]'
  when:
    - item.value.state|default('present') == 'absent'
    - item.key in dummy_interfaces
- name: add set command
  set_fact:
    dummy_interface_commands: '{{ dummy_interface_commands }} + ["set interfaces dummy {{ item.key }} address {{ item.value.ipv4 }}"]'
  when:
    - item.value.state|default('present') == 'present'
    - item.key not in dummy_interfaces
    - item.value.ipv4 is defined
- name: add set command
  set_fact:
    dummy_interface_commands: '{{ dummy_interface_commands }} + ["set interfaces dummy {{ item.key }} address {{ item.value.ipv6 }}"]'
  when:
    - item.value.state|default('present') == 'present'
    - item.key not in dummy_interfaces
    - item.value.ipv6 is defined
- name: add set description command
  set_fact:
    dummy_interface_commands: '{{ dummy_interface_commands }} + ["set interfaces dummy {{ item.key }} description {{ item.value.description }}"]'
  when:
    - item.value.state|default('present') == 'present'
    - item.value.description is defined
- vyos_command:
    commands: "{{ dummy_interface_commands }}"

ethernet_interface.yml

- vyos_l3_interface:
    name: "{{ item.key }}"
    ipv4: "{{ item.value.ipv4|default(omit) }}"
    ipv6: "{{ item.value.ipv6|default(omit) }}"
    state: "{{ item.value.state|default('present') }}"
  when: item.value.state|default('present') in ['present', 'absent']
- vyos_interface:
    name: "{{ item.key }}"
    description: "{{ item.value|default(omit) }}"
    address: "{{ item.value.address|default(omit) }}"
    duplex: "{{ item.value.duplex|default(omit) }}"
    mtu: "{{ item.value.mtu|default(omit) }}"
    speed: "{{ item.value.speed|default(omit) }}"
    state: "{{ item.value.state|default('present') }}"

playbook.yml

- name: sample
  hosts: all
  become: yes
  vars:
    vyos_ethernet_interfaces:
      eth0:
        ipv4: dhcp
        state: parent
    vyos_dummy_interfaces:
      dum0:
        ipv4: 10.2.0.1/24
        description: "description"
        state: present
      dum1:
        ipv4: 10.2.1.1/24
        state: absent
  tasks:
    - name: manage ethernet interface
      include_tasks: ethernet_interface.yml
      with_dict: "{{ vyos_ethernet_interfaces }}"
    - name: manage dummy interface
      block:
        - name: get registered dummy interfaces
          vyos_command:
            commands:
              - "show interfaces dummy | tail -n +4 | awk '{print $1}'"
          changed_when: false
          register: result
        - set_fact:
            dummy_interfaces: result.stdout_lines
        - name: manage dummy interface
          include_tasks: dummy_interface.yml
          with_dict: "{{ vyos_dummy_interfaces }}"
      when: vyos_dummy_interfaces