def _get_extend(self):
return self.__extend<EOL>
Getter method for extend, mapped from YANG variable /overlay_gateway/site/extend (container)

    YANG Description: This configuration represents the layer2 domains to
be extended towards this site. In other words, it
represents switchport VLANs on the tunnels to the
site. VNI classification will be derived from 'map
vlan' configuration on this overlay gateway.