def _set_extend(self, v, load=False):
if hasattr(v, "<STR_LIT>"):<EOL><INDENT>v = v._utype(v)<EOL><DEDENT>try:<EOL><INDENT>t = YANGDynClass(v,base=extend.extend, is_container='<STR_LIT>', presence=False, yang_name="<STR_LIT>", rest_name="<STR_LIT>", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'<STR_LIT>': {u'<STR_LIT:info>': u'<STR_LIT>'}}, namespace='<STR_LIT>', defining_module='<STR_LIT>', yang_type='<STR_LIT>', is_config=True)<EOL><DEDENT>except (TypeError, ValueError):<EOL><INDENT>raise ValueError({<EOL>'<STR_LIT>': """<STR_LIT>""",<EOL>'<STR_LIT>': "<STR_LIT>",<EOL>'<STR_LIT>': """<STR_LIT>""",<EOL>})<EOL><DEDENT>self.__extend = t<EOL>if hasattr(self, '<STR_LIT>'):<EOL><INDENT>self._set()<EOL><DEDENT>
Setter method for extend, mapped from YANG variable /overlay_gateway/site/extend (container)
    If this variable is read-only (config: false) in the
    source YANG file, then _set_extend is considered as a private
    method. Backends looking to populate this variable should
    do so via calling thisObj._set_extend() directly.

    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.