How to understand the router's package transition rate
Cool dragon
2004-3-9
User questions: Ask the Cisco2600 router package forwarding rate calculated with a large package?
There are many indicators, such as switched capacity (Gbps), backplane bandwidth (Gbps), throughput or packet transition rate (MPPS), and more. The most important indicators of a switch performance are: throughput (MPPS), because this is the performance indicator that can eventually reflect the switch application, the user is generally going straight to this topic, is to see how many packages can be forwarded per second. The throughput is generally referred to as the unit port theory throughput when the package length is 64 bytes is the product of the total number of switches, the throughput (MPPS) = full-configured port number X unit port theoretical throughput (MPPS). The unit of exchange forwarding performance is "Million Packet Per Second" - "Million Hundred Hundreds per second", that is, the number of packets that can be processed per second. The higher this number, the stronger the switching of the switch, the word "throughput" has increased most in the performance description of the switch, but also mentioned in routing roads.
Router has a performance indicator similar to the switch. Router performance has two more important indicators: backplane capabilities (backplane bandwidth / bus bandwidth), referring to routine backplane capacity or bus capability. The throughput rate refers to the router's packet routing. The throughput of the router is generally used by KPPS, which is "a thousand packets per second", because the general router's LAN to WAN's packet routing rate is not very high, and the relative switch is easy to reach millions. The number of packets, it is much smaller, so there is no "MPPS". Unless it is a high-end backbone router, such as Cisco at the Cisco 10000 router, its forwarding rate is 6.2Mpps. Another reason is that in the high-end field, the boundaries of the router and switches are really blurred, and some products are simply called "exchange routers" and the forwarding ability is high.
Router can be divided into high-end routers and low-end routers. Pack Exchange Capacity> 1 MPPS router can be called a medium and high-end router, and the package exchange capability can be referred to as a low-end router below 1 MPPS. Such as Cisco 7500, 10000 Series, 12000 Series Routers package transfers are millions of packages per second; and 3600 series and 2600 series are low-end routers. So we can also see that routers can generally use kpps from the 2600 series and throughput rates.
model
Homes (Max, Fast-Switching)
2610-12
15K PPS
2620/21
25K PPS
2650/51
37K PPS
2610 / 11xm
20K PPS
2620 / 21xm
30K PPS
2650 / 51xm
40K PPS
2691
70K PPS
When evaluating the forwarding capacity of the router, some evaluation tools use the following 6 bytes of packets to make evaluation criteria, which are: 64b, 128b, 256b, 512b, 1024b, 1518b byte length data packets, respectively, The most common is a 64B called a small bag and 128b called a large package. Smooth Cisco's website found such a "e" article: "Throughput of the cisco 2651xm at the smaller packet size of 64 bytes", So Xiao Chang believes that Cisco will also use the big current parcel 64 bytes as its own product Evaluation criteria, is this it too strong? The little cool is a bit sincere and fearful, but I will think that everyone uses a small bag to do standards. Is this more competitive? There is no need to use big bags or bigger bags, even more big. However, if it comes back, if there is no special explanation of the throughput of the router, its business data package should refer to the most universal business, but also the most common LAN to Wan forwarding capability. But if it is a business such as a VPN, it is definitely "big bag" (such as 168-bit 3Des is a 1400-byte package), because the VPN service is transferred on public network, so in the VPN packet In order to add a lot of encrypted "bytes", such a package is very large, corresponding, the router is relatively slow, and the forwarding ability will reduce it accordingly.
Summary: The above is only a thinking of Xiaoku for netizens in the forum. I also hope that the readers will participate in the discussion. More importantly, in the purchase of routers can have a correct examination of the product's forwarding ability indicators so that the products will be purchased. Can be competent in your own network business needs.
