以太网数据包速率计算方法（Ethernet packet rate calculation method）.docVIP

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以太网数据包速率计算方法（Ethernet packet rate calculation method）.doc

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以太网数据包速率计算方法（Ethernet packet rate calculation method）

以太网数据包速率计算方法（Ethernet packet rate calculation method） Ethernet data packet rate calculation method 2011-01-19 23:02:29 Category: system operation and maintenance We know that the speed packet forwarding rate of 1 Gigabit ports is 1.4881MPPS, Fast port wire speed packet forwarding rate is 0.14881MPPS, which is the international standard, but how come it? The specific data package will be in front of each package plus 64 in the transmission process (preamble) preamble is a 64 byte packet was only 512 bit, but in fact there will be 512+64+96=672bit in the transmission process, that is when the length of a packet is actually Gigabit port line 672bit fast packet forwarding rate is approximately equal to =1000Mbps/672=1.488095Mpps, 1.4881Mpps, in addition to 10 megabytes For 0.14881Mpps, then its very simple. Actually, the PPS value in the device parameter is multiplied by 672 directly, so it turns into a more popular BPS concept that we can understand. General sales in order to facilitate the calculation and integer understanding, change 672 to 500. Understand the selection of network equipment after suddenly discovered that the original is so simple, I only need is the total number of nodes in the network and bandwidth demand and traffic demand, so the performance of the switches and routers need to type models ready to come out. Note: many of todays devices are three - layer switches, and the parameters we see are for three - layer modules and two - layer modules, respectively. For example, the 4 floor mentioned 6509, thats it. The data exchange capability is 720Gbps, but the routing packet forwarding capability is 400Mpps. There is no contradiction here. Because neither of the two data describes a thing. Switch backplane calculation The backplane bandwidth of a switch is the maximum amount of data that can be exchanged between a switch interface processor or an interface card and a data bus. Backplane bandwidth indicates the total data exchange capability of the swit