L2VPN changes

        <config>

          <index>{{index}}</index>

          <description>{{description}}</description>

        {% if vlan_id is not defined %}

          <untagged-allowed xmlns="http://www.advaoptical.com/cim/adva-dnos-oc-interfaces">true</untagged-allowed>

          {% endif%}

        </config>

        {% if vlan_id is defined %}

        <vlan xmlns="http://openconfig.net/yang/vlan">

          <match>

            <single-tagged>

            </single-tagged>

          </match>

        </vlan>

        {% endif%}

        {% if address_ip is defined %}

        <oc-ip:ipv4>

          <oc-ip:addresses>

            {% endif %}

            {% if type=='L2VSI' %}

            {% if description is defined %}<description>{{description}}</description>{% endif %}

            <enabled>false</enabled>

            <enabled>true</enabled>

            <mtu>1500</mtu>

        </config>

        <encapsulation>