What are the conditions for the bandwidth of the backboard of a qualified switch?

What are the conditions for the bandwidth of a qualified switch's backboard? For the bandwidth standard of the switch's backboard, netizens have their own preferences. The following describes the conditions that the switch's backboard bandwidth should meet as a qualified switch. I hope you can give it a try and give more friends a valuable reference.

The backboard bandwidth is the maximum amount of data that can be transferred between the vswitch interface processor or interface card and the data bus. The higher the bandwidth of the backboard of A vswitch, the stronger the ability to process data, but the design cost will also rise. However, how can we check whether the bandwidth of A vswitch's backboard is sufficient? Obviously, the estimation method is useless. I think we should consider the following two aspects:

 

Vswitch board bandwidth calculation

The sum of the number of ports X on any port capacity should be 2 times smaller than the bandwidth of the vswitch backboard, enabling full-duplex non-blocking switching. It is confirmed that the vswitch has the conditions to maximize the data exchange performance. Full configuration throughput (Mpps) = number of fully configured GE ports × 1. 488Mpps the theoretical throughput of One gigabit port when the packet length is 64 bytes is 1.488 Mpps.

For example, A vswitch that can provide a maximum of 64 Gigabit ports must have a full configuration throughput of 64 × 1.488 Mpps = 95.2 Mpps to ensure that the average speed of any port is working, provides non-blocking packet switching. Assume that a vswitch can provide a maximum of 176 Gigabit ports and the declared throughput is less than 261.8 Mpps (176x1.488 Mpps = 261.8 ), the user has reason to think that the switch adopts a blocking structure design.

Generally, the switches that both meet the requirements are qualified switches. For vswitches with relatively large backboard bandwidth and low throughput, in addition to retaining the ability to upgrade and expand, they are software. The design of dedicated chip circuits is problematic. For vswitches with relatively small backboard bandwidth and high throughput, the overall performance is relatively high.

However, the bandwidth of the vswitch backboard can be believed by the manufacturer, but the throughput cannot be believed by the manufacturer. because the latter is a design value, the test is very difficult, and the significance is not great. The bandwidth speed of the vswitch backboard is generally Mbps, which refers to the second layer. Mpps is used for switching between three or more layers.