sonic-buildimage/files/build_templates/arp_update_vars.j2

{
    "switch_type": "{% if DEVICE_METADATA and 'localhost' in DEVICE_METADATA and 'switch_type' in DEVICE_METADATA['localhost'] %}{{ DEVICE_METADATA['localhost']['switch_type'] }}{%endif %}",
    "interface": "{% for (name, prefix) in INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
    "pc_interface" : "{% for (name, prefix) in PORTCHANNEL_INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
    "vlan_sub_interface": "{% for (name, prefix) in VLAN_SUB_INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
    "vlan" : "{% if VLAN %}{{ VLAN.keys() | join(' ') }}{% endif %}",
    "static_route_nexthops": "{% if STATIC_ROUTE %}{% for static_route_prefix, static_route_attr in STATIC_ROUTE.items() %}{%- if static_route_prefix -%}{{ static_route_attr['nexthop'].split(',') | join(' ') | lower + " " }}{%- endif -%}{% endfor %}{% endif %}"
}