tst.yml

---
- hosts: bm1
  vars:
    data: '{{ aps[ ap ][ epg ] }}' # do not reuse var name 'epg', bcs infinite recurion
    test: '{{ tsts[ data.tst ] }}'
    ip: '{{ test.ip }}' # or: '{%- for i, a in ifcs if a == ip -%}{ "{{ a }}": "{{ i }}" }{%- endfor -%}'
    pip: '{{ tsts[ aps[ test.pap ][ test.pepg ].tst ].ip }}'
  tasks:
    - command: ip -br -4 addr
      register: reg
    - set_fact: # one more step because cannot directly get correct json with regex_replace for some weird reason
        ifcs: '{{ ifcs | default([]) + [ (item | regex_replace("^(\w+)\s+\w+\s+(\d+\.\d+.\d+.\d+)/.*$", "\1 \2")).split() ] }}'
      with_list: '{{ reg.stdout_lines }}'
    - name: Test from {{ ip }} to {{ pip }}
      vars:
        eth: '{%- for i, a in ifcs if a == ip -%}{{ i }}{%- endfor -%}'
      command:
        ping -q -c 10000 -A -M do -s 8972 -I {{ eth }} {{ pip }}
      register: reg
    - debug:
        msg: 'Stats:\n{{ reg.stdout_lines[-2::] | join("\n") }}'