{#  ############################################## fail if add, no longer supported #}
{% if 'add' in interface['value']['switchport']['trunk']['allowed_vlans'] %}
{{ you_cant_use_the_add_statement_anymore }}
{% endif %}
{#  ############################################## remediate the trunk list #}
{% set trunk_vlan_changes = configuration_prechange['matches']['sections'][0]['section_content']|trunk_vlan_remediate(interface['value']['switchport']['trunk']['allowed_vlans']['vlans'],20) %}
{% if 'vlans' in trunk_vlan_changes and trunk_vlan_changes['vlans'] %}
{% set _ = desired.append("switchport trunk allowed vlan %s" % (trunk_vlan_changes['vlans'])) %}
{% endif %}{# vlans #}
{% for entry in trunk_vlan_changes['vlans_add'] %}
{% set _ = desired.append("switchport trunk allowed vlan add %s" % (entry)) %}
{% endfor %}{# vlans_add #}
{% for entry in trunk_vlan_changes['vlans_remove'] %}
{% set _ = desired.append("switchport trunk allowed vlan remove %s" % (entry)) %}
{% endfor %}{# vlans_remove #}
{% endif %}{# allowed-vlans #}
{% endif %}{# switchport trunk #}