code: def _parse_interfaces(self):
          
          interfaces = dict()
          names = re.findall(r'^interface (Po.+)$', self.config, re.M)
          for name in names:
              config = self.get_block('interface %s' % name)
              match = re.search(r'mlag (\d+)', config)
              if match:
                  interfaces[name] = dict(mlag_id=match.group(1))
          return dict(interfaces=interfaces)
docs: Scans the global config and returns the configured interfaces
  
          Returns:
              dict: A dict object that is intended to be merged into the
                  resource dict.