check_vlan_present.yml

---
- name: Verify and create VLANs
  # VLAN should only be created, if it does not exit on the hosts (Cisco NEXUS 9000v)
  hosts: LEAF2
  gather_facts: no
  vars:
    vlan_exists: false
    vlans:
      - { vlan_id: 2, name: TEST }
  #vars_files:
  #  - vlans.dat
  tasks:

    - name: Get Nexus facts
      cisco.nxos.nxos_facts:
        gather_network_resources: vlans
      register: data

    #- debug: var=data.ansible_facts.vlan_list verbosity=0

    - debug: var=ansible_network_resources['vlans'][1] verbosity=0

    - debug:
        # dict
        msg:  "{{ 'ansible_network_resources : ' + ansible_network_resources|type_debug }}"

    - debug:
        # list
        msg:  "{{ 'ansible_network_resources[vlan] : ' + ansible_network_resources['vlans']|type_debug }}"

    - debug:
        msg:  "{{ 'vlans : ' + vlans|type_debug }}"

    - name: Store VLAN facts
      copy:
        content: "{{ ansible_network_resources | to_nice_yaml }}"
        dest: "{{ playbook_dir }}/host_vars/{{ inventory_hostname }}"

    - name: DOES VLAN EXIST
      set_fact:
        vlan_exists: true
      when: "vlans in ansible_network_resources['vlans']"

    - debug:
       msg: "{{ 'VLAN exists : ' + vlan_exists|string }}"


    - name: Create new VLANs only
      cisco.nxos.nxos_vlan:
        vlan_id: "{{ item.vlan_id }}"
        name: "{{ item.name }}"
        #state:   "{{ item.state | default('present') }}"
      loop: "{{ vlans }}"
      when: '{{ vlan_exists == false }}'

[root@centos playbooks]#



# ==== Output


[root@centos playbooks]# ansible-playbook check_vlan_present.yml

PLAY [Verify and create VLANs] *****************************************************************************************************************************************************************************************************************************************************************************

TASK [Get Nexus facts] *************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2]

TASK [debug] ***********************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2] => {
    "ansible_network_resources['vlans'][1]": {
        "enabled": true,
        "mode": "ce",
        "name": "TEST",
        "state": "active",
        "vlan_id": 2
    }
}

TASK [debug] ***********************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2] => {
    "msg": "ansible_network_resources : dict"
}

TASK [debug] ***********************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2] => {
    "msg": "ansible_network_resources[vlan] : list"
}

TASK [debug] ***********************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2] => {
    "msg": "vlans : list"
}

TASK [Store VLAN facts] ************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2]

TASK [DOES VLAN EXIST] *************************************************************************************************************************************************************************************************************************************************************************************
skipping: [LEAF2]

TASK [debug] ***********************************************************************************************************************************************************************************************************************************************************************************************
ok: [LEAF2] => {
    "msg": "VLAN exists : False"
}

TASK [Create new VLANs only] *******************************************************************************************************************************************************************************************************************************************************************************
[WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: {{ vlan_exists == false }}
ok: [LEAF2] => (item={'vlan_id': 2, 'name': 'TEST'})

PLAY RECAP *************************************************************************************************************************************************************************************************************************************************************************************************
LEAF2                      : ok=8    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0

[root@centos playbooks]#