code: def _check(self):
          
          if conf.contribs['LLDP'].strict_mode():
              management_address_len = len(self.management_address)
              if management_address_len == 0 or management_address_len > 31:
                  raise LLDPInvalidLengthField(
                      'management address must be  1..31 characters long - '
                      'got string of size {}'.format(management_address_len))
docs: run layer specific checks