Ansible cli argument from with ansible-play

Can somebody give me a pointer for using CLI commands with Ansible-Play.

I working with a group of network devices and I need to issue the same command to all of them to find a specific IP address in the arp table. I would like to do something like the following:

Ansible-play myplay myip=10.10.0.1

Use that myip address in the Ansible-play as a jinja2 variable in my role.

- name: run show arp on remote devices

  eos_command:

    commands: show arp {{ myip }}

    provider "{{ cli }}"

I found the answer to my own question.

http://docs.ansible.com/ansible/playbooks_variables.html#passing-variables-on-the-command-line