With the arrival of 5G and the arrival of the new Internet of Things, the requirements for switches will be higher, and the demand will be large.
The Internet of Everything is inseparable from the network infrastructure equipment-switches, and switches will play a crucial networking link in the Internet of Things.
Four types network structure modes of switches:
01
Cascading
This is the most commonly used networking method, and it is connected through the cascade port (UpLink) on the switch. Cascading can be defined as two or more switches connected to each other in a certain way. Multiple switches can be cascaded in various ways as required.
In a larger local area network such as a campus network (campus network), multiple switches generally form a bus, tree or star cascade structure according to performance and purpose.
It should be noted that switches cannot be cascaded indefinitely. If more than a certain number of switches are cascaded, broadcast storms will eventually be caused, resulting in serious degradation of network performance.
Structure diagram:
02
Port aggregation
Port aggregation binds multiple physical links between two devices to form a logical link, so as to achieve the purpose of doubling the bandwidth (the logical link bandwidth is equivalent to the sum of the physical link bandwidths).
In addition to increasing bandwidth, port aggregation can evenly distribute traffic on multiple links and play a role in load balancing; when one or more links fail, the traffic will be transferred to other links as long as the other links are normal. On the road, the entire process is completed in a few milliseconds, thus playing a redundant role and enhancing the stability and security of the network.
Structure diagram:
03
Stacking
Stacking refers to combining more than one switch to work together to provide as many ports as possible in a limited space.
Multiple switches are stacked to form a stacking unit. There is a parameter of "maximum stackable number" in the performance index of stackable switches, which refers to the maximum number of switches that can be stacked in a stacking unit, and represents the maximum port density that can be provided in a stacking unit.
Generally speaking, switches of different manufacturers and models can be cascaded with each other, but the stacking is different. It must be performed between stackable switches of the same type (at least switches of the same manufacturer); cascading is only between switches. Simple connection and stacking use the entire stacking unit as a switch, which means not only the increase of port density, but also the widening of system bandwidth.
Stacking can greatly increase switch port density and performance. Stacking units have port densities and performance comparable to larger rack switches at a much lower investment and flexibility than rack switches. This is the advantage of stacking.
Rack switches can be said to be the product of stacking to a higher stage. Rack switches generally belong to switches above the department level. They have multiple slots, high port density, support multiple network types, good scalability, and strong processing capabilities, but are expensive.
Structure diagram:
04
Layered
This method is generally used in more complex switch structures, and can be divided into: access layer, aggregation layer, and core layer according to functions.
The three-layer network architecture adopts a hierarchical model design, which divides the complex network design into several layers, each layer focuses on some specific functions, so that a complex big problem can be turned into many simple small problems.
Structure diagram:
With the development of local area network and metropolitan area network, the above four methods will be more and more widely used. That‘s it for today‘s sharing, do you guys understand?
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