How to do it...

1. In the group_vars/network.yml file, add the following content to define the generic interface parameters:

$ cat group_vars/network.yml
<-- Output Trimmed for brevity ------>
intf_duplex: full
intf_mtu: 1500

2. Create a new file, lan.yml, under the group_vars folder, with the following data to define the interfaces on our Cisco devices:

$ cat group_vars/lan.yaml
 
interfaces:
  core01:
    - name: Ethernet0/1
      description: access01_e0/1
      mode: trunk
    - name: Ethernet0/2
      description: access02_e0/1
      mode: trunk
    - name: Ethernet0/3
      description: core01_e0/3
      mode: trunk
 <--   Output Trimmed for brevity ------>
  access01:
    - name: Ethernet0/1
      description: core01_e0/1
      mode: trunk
    - name: Ethernet0/2
      description: core02_e0/1
      mode: trunk
    - name: Ethernet0/3
      description: Data_vlan
      mode: access
      vlan: 10

3. Update the pb_build_network.yml playbook file with the following task to set up the interfaces:

    - name: "P1T3: Configure Interfaces"
      ios_interface:
        name: "{{ item.name }}"
        description: "{{ item.description }}"
        duplex: "{{ intf_duplex }}"
        mtu: "{{ intf_mtu }}"
        state: up
      loop: "{{ interfaces[inventory_hostname] }}"
      register: ios_intf