pysnmp getcmd超时不起作用

Question

如果我使用一个CommandGenerator两次请求相同的ip，第一次超时为0，第二次超时为60，则所有结果均为“超时前未收到SNMP响应”，第二次的超时似乎不起作用。 每次创建CommandGenerator或请求不同的IP都会获得正确的结果。 我确定超时已传递给UdpTransportTarget，下面是我的零件代码：

 _cmdgen = cmdgen.CommandGenerator()
        import time
        try:
            #a = get_cmdgen()
            start_time = time.time()
            worker = SNMP(
                            "1.1.1.",
                            "public",
                            logger=logging,
                            port=161,
                            timeout=0,
                            retries=0,
                            device_info=device_info,
                            model_version=1
                            )

            output = worker.bulk_get(_cmdgen,["1.3.6.1.2.1.1.1.0"])
            print output
        except Exception as e:
            print str(e)
        finally:
            endtime = time.time()
            print (endtime-start_time)

        try:
            #a = get_cmdgen()
            start_time = time.time()
            worker1 = SNMP(
                "1.1.1.1",
                "public",
                logger=logging,
                port=161,
                timeout=60,
                retries=0,
                device_info=device_info,
                model_version=1
            )
            output = worker1.bulk_get(_cmdgen,["1.3.6.1.2.1.1.1.0"])
            print output
        except Exception as e:
            print str(e)
        finally:
            endtime1 = time.time()
            print (endtime1-start_time)