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请问关于CACTI工具的有关问题

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Release： 2016-06-13 12:31:11
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请教关于CACTI工具的问题
最近，在用JAVA利用SNMP协议编写一个统计网络设备流量的程序，发现SNMP协议中，设备端口流量的数值是累积的流量值，需要通过差值除以时间差，才能得到端口每秒的流量。可是对应端口流量的数据类型是无符号32位的，对于千兆级以上的端口，几十秒的时间，这个值就会达到最大，然后就会归零并重新开始累积。
我知道CACTI也是用SNMP协议采集数据的，默认是5分钟统计一次。对于流量很大的端口，5分钟内，流量数据会发生很多次归零的情况。那CACTI是怎么处理这种情况的呢？我没学过PHP，所以无法研究它的源码，难道CACTI是时时刻刻都在采集数据吗？不知道有没有研究过CACTI工具的前辈，指点我一下。谢谢了！

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cacti java php snmp
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