'get existing info'

def get_existing(self):

    if (not self.ospf_info):
        return
    if self.ospf_info['interface']:
        self.existing['interface'] = self.interface
        self.existing['cost'] = self.ospf_info['interface'].get('configCost')
        self.existing['hello_interval'] = self.ospf_info['interface'].get('helloInterval')
        self.existing['dead_interval'] = self.ospf_info['interface'].get('deadInterval')
        self.existing['silent_interface'] = self.ospf_info['interface'].get('silentEnable')
        self.existing['auth_mode'] = self.ospf_info['interface'].get('authenticationMode')
        self.existing['auth_text_simple'] = self.ospf_info['interface'].get('authTextSimple')
        self.existing['auth_key_id'] = self.ospf_info['interface'].get('keyId')
        self.existing['auth_text_md5'] = self.ospf_info['interface'].get('authTextMd5')
    self.existing['process_id'] = self.ospf_info['processId']
    self.existing['area'] = self.ospf_info['areaId']
