Thanks Ajay very much.

I managed to get some logging , but still cannot find where the issue is:

root@netadmin-Virtual-Machine:/etc/ansible# ansible-playbook
ios_command_1.yml -vvvv
  1903 1533876596.09467: starting run
ansible-playbook 2.5.7
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules',
u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0]
Using /etc/ansible/ansible.cfg as config file
  1903 1533876596.34001: Added group all to inventory
  1903 1533876596.34044: Added group ungrouped to inventory
  1903 1533876596.34086: Group all now contains ungrouped
setting up inventory plugins
  1903 1533876596.34433: Loading InventoryModule 'host_list' from
/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/host_list.py
  1903 1533876596.34638: assigned :doc
  1903 1533876596.34679: assigned :plainexamples
  1903 1533876596.34763: Loading InventoryModule 'script' from
/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/script.py
  1903 1533876596.35214: assigned :doc
  1903 1533876596.35278: Loaded config def from plugin (inventory/script)
  1903 1533876596.35376: Loading InventoryModule 'yaml' from
/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/yaml.py
  1903 1533876596.35778: assigned :doc
  1903 1533876596.35834: assigned :plainexamples
  1903 1533876596.35906: Loaded config def from plugin (inventory/yaml)
  1903 1533876596.36043: Loading InventoryModule 'ini' from
/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/ini.py
  1903 1533876596.36778: assigned :doc
  1903 1533876596.36845: assigned :plainexamples
  1903 1533876596.36982: Loading InventoryModule 'auto' from
/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/auto.py
  1903 1533876596.37186: assigned :doc
  1903 1533876596.37248: assigned :plainexamples
  1903 1533876596.37323: Examining possible inventory source:
/etc/ansible/hosts
  1903 1533876596.37387: Attempting to use plugin host_list
(/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/host_list.py)
  1903 1533876596.37440: /etc/ansible/hosts did not meet host_list
requirements
  1903 1533876596.37488: Attempting to use plugin script
(/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/script.py)
  1903 1533876596.38834: /etc/ansible/hosts was not parsable by script
  1903 1533876596.38956: Attempting to use plugin yaml
(/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/yaml.py)
  1903 1533876596.39089: Loading data from /etc/ansible/hosts
  1903 1533876596.39455: /etc/ansible/hosts was not parsable by yaml
  1903 1533876596.39525: Attempting to use plugin ini
(/usr/lib/python2.7/dist-packages/ansible/plugins/inventory/ini.py)
  1903 1533876596.39988: Added group switches to inventory
  1903 1533876596.40120: set inventory_file for 10.11.32.100
  1903 1533876596.40190: set inventory_dir for 10.11.32.100
  1903 1533876596.40245: Added host 10.11.32.100 to inventory
  1903 1533876596.40307: Added host 10.11.32.100 to group switches
Parsed /etc/ansible/hosts inventory source with ini plugin
  1903 1533876596.40417: Reconcile groups and hosts in inventory.
  1903 1533876596.40485: Group all now contains switches
  1903 1533876596.40814: Loading CacheModule 'memory' from
/usr/lib/python2.7/dist-packages/ansible/plugins/cache/memory.py
  1903 1533876596.41029: assigned :doc
  1903 1533876596.43485: Loading data from /etc/ansible/ios_command_1.yml
  1903 1533876596.74245: Loading CallbackModule 'default' from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/default.py
Loading callback plugin default of type stdout, v2.0 from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/default.pyc
  1903 1533876596.81133: assigned :doc
  1903 1533876596.81993: Loading ModuleDocFragment 'default_callback' from
/usr/lib/python2.7/dist-packages/ansible/utils/module_docs_fragments/default_callback.py
  1903 1533876596.82200: Loaded config def from plugin (callback/default)
  1903 1533876596.82402: Loading CallbackModule 'actionable' from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/actionable.py
(found_in_cache=False, class_only=True)
  1903 1533876596.82606: assigned :doc
  1903 1533876596.82684: Loading ModuleDocFragment 'default_callback' from
/usr/lib/python2.7/dist-packages/ansible/utils/module_docs_fragments/default_callback.py
(found_in_cache=True, class_only=False)
  1903 1533876596.82844: Loaded config def from plugin (callback/actionable)
  1903 1533876596.82983: Loading CallbackModule 'context_demo' from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/context_demo.py
(found_in_cache=False, class_only=True)
  1903 1533876596.83226: assigned :doc
  1903 1533876596.83367: Loading CallbackModule 'debug' from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/debug.py
(found_in_cache=False, class_only=True)
  1903 1533876596.83591: assigned :doc
  1903 1533876596.83677: Loading ModuleDocFragment 'default_callback' from
/usr/lib/python2.7/dist-packages/ansible/utils/module_docs_fragments/default_callback.py
(found_in_cache=True, class_only=False)
  1903 1533876596.83953: Loaded config def from plugin (callback/debug)
  1903 1533876596.84033: Loading CallbackModule 'default' from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/default.py
(found_in_cache=False, class_only=True)
  1903 1533876596.84737: assigned :doc
  1903 1533876596.84830: Loading ModuleDocFragment 'default_callback' from
/usr/lib/python2.7/dist-packages/ansible/utils/module_docs_fragments/default_callback.py
(found_in_cache=True, class_only=False)
  1903 1533876596.84993: Loaded config def from plugin (callback/default)
  1903 1533876596.85119: Loading CallbackModule 'dense' from
/usr/lib/python2.7/dist-packages/ansible/plugins/callback/dense.py
(found_in_cach