code: def list(self, environment_vip=None):
          
  
          uri = 'api/networkv6/?'
          if environment_vip:
              uri += 'environment_vip=%s' % environment_vip
  
          return super(ApiNetworkIPv6, self).get(uri)
docs: List networks redeipv6 ]
  
          :param environment_vip: environment vip to filter
  
          :return: IPv6 Networks