ansible_cache/ios_devices/prefix_list_update.yml

---
- name: Update device prefix list 
  hosts: testhosts
  gather_facts: false
  connection: network_cli
  roles:
  - common
  tasks:

    # Read the CSV file and return a list of dicts with column names as keys
    - name: Read CSV file with prefixes information
      read_csv:
        path: prefixes_list.csv
      register: prefix_list
      delegate_to: localhost

    - name: Get current prefix lists config
      cisco.ios.ios_command:
        commands: show run | i ip prefix-list
      register: config_before

    - name: Print current prefix lists config
      debug:
        msg: "{{ config_before.stdout_lines }}"

    - name: Apply new prefix lists
      cisco.ios.ios_prefix_lists:
        config:
          - afi: ipv4
            prefix_lists:
              - name: "{{ item.Site }}"
                description: "{{ item.Description }}"
                entries:
                  - action: permit
                    prefix: "{{ item.Prefix }}"
                    sequence: 10
        state: merged
      loop: "{{ prefix_list.list }}"

    - name: Get updated prefix lists config
      cisco.ios.ios_command:
        commands: show run | i ip prefix-list
      register: config_after

    - name: Print updated prefix lists config
      debug:
        msg: "{{ config_after.stdout_lines }}"

    - name: Update target route map
      cisco.ios.ios_config:
        lines:
          - "route-map TEST_MAP permit {{ item.SequenceNo }}"
          - " match ip next-hop prefix-list {{ item.Site }}"
      loop: "{{ prefix_list.list }}"