sonic-buildimage/files/build_templates/swss_vars.j2

{
    "asic_type": "{{ asic_type }}",
    {% if asic_subtype is defined and asic_subtype != '' -%}
    "asic_subtype": "{{ asic_subtype }}",
    {% endif -%}
    "asic_id": "{{ DEVICE_METADATA.localhost.asic_id }}",
    "mac": "{{ DEVICE_METADATA.localhost.mac }}",
    "resource_type": "{{ DEVICE_METADATA.localhost.resource_type }}",
    "synchronous_mode": {% if DEVICE_METADATA.localhost.synchronous_mode == "disable" %}"disable"{% else %}"enable"{% endif %}
}