SFM2-200G switch structure module

Description

[overview] :SFM2-200G switch structure module

SFM2-200G switch structure module

1. Share the bus
Bus switching is the oldest data switching mode. The main feature of this mode is that there is no special switching network chip, and the data is transferred between lines and cards through the shared backplane bus. The backplane bus is occupied by lines and cards in a time. The structure and technology are relatively simple, but the switching capacity is limited by the bandwidth of the backplane bus, which makes it impossible to build a large-capacity system. Moreover, with the increase of the bandwidth of the backplane bus, the synchronization control of bitstreams also becomes a bottleneck. At present, the switching capacity of the system using this switching mode is generally less than 32G, and the system is generally blocked. This type of switching is still used on some older models and will not be used on new systems. This form of exchange will gradually be phased out.
2. Ring switching
Ring switching is still essentially a bus switching mode. The improvement is to move the bus to the chip instead of on the backplane.
Bandwidth has improved, but not radically; The system capacity of this switching mode is between 32G-64G, generally speaking, there is a blocking system; This form of exchange will gradually be phased out.
3. Shared memory
Switches with a shared memory structure use large amounts of high-speed RAM to store input data and rely on a central switching engine to provide full-port high-performance connectivity, with the core engine checking each input packet to determine routing. This kind of switch is relatively easy to implement in design, but when the switching capacity expands to a certain extent, the memory operation will be delayed. In addition, due to the problem of bus interconnection, the redundancy of the switching engine is relatively complicated in this design, so it is relatively difficult for this kind of switch to achieve stability if it provides two engines. As a result, we can see that the early network core switches introduced in the market tend to be single-engine, especially as the number of switch ports increases, the price of central memory becomes high due to the need for more memory capacity and faster speeds. Switching engines can be a performance bottleneck.

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SFM2-200G

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