The Evolution Of The Three
Three more recent exchange technology concerns by business users, the more widespread application, such as corporate and campus networks all three functions with the exchange network, switches are three switches. Visible, three-switching technology is widely used in large enterprises, campus network infrastructure among other places.
Three switching in the end it is what kind of technology, how it quickly became a few years time to build a major multi-service converged network power? There are three switching technology changes? The development trend and future market it would look like that? Following the above problems will make their own opinions.
The origin of the three-tier exchange
Second floor of the exchange of technology development from the first bridge to VLAN (Virtual LAN), in the local area network construction and transformation, has been widely used. The second layer in the OSI seven layer switching technology work in the second layer network model, that the data link layer. It receives data packets in accordance with the purpose of MAC address forwarding, or high-level protocol for network layer is transparent. It does not deal with the network layer IP address, does not handle high-level protocol such as TCP, UDP port address, not to recognize the agreement from the application layer, it only needs to know the physical address of the packet that MAC address, data exchange is by pure hardware implementation, its very fast, from 10mb, 100mb, to today’s 1000mb or higher, and its development very quickly, this is a significant advantage of the exchange layer. However, it can not handle the different data exchange between IP subnets. The traditional router can handle a large number of data packets across IP subnets, but it’s far more efficient than the second floor to be transmitted much lower, so in order to use the advantage of high efficiency, two-story forward, but also three of the IP address packet switching technology was born three. Three-generation switching technology, with its innovative technological superiority, rapid alternative to the pure layer switching technology, is widely used in various occasions.
Three switching Three-tier exchange (also known as multi-layer switching technology, or IP switching technology) is relative to the traditional concept put forward by the exchange, its origins can conclude that what is three-switching technology, simply, layer switching technology that is: two or three-forward switching technology + technology. It solves the LAN segment divided, the segment in the subnet have to rely on the router to manage the situation and solve the traditional low-speed routers, complex network bottlenecks caused.
Exchange of work in the OSI seven layer network model, the third layer of the network layer, is the use of third-layer protocol of the ip packet header information to be marked on the follow-up data services, three switches on there is no need for each received packet to determine routing unpacking, but the data packets directly forwarding the data stream exchange, that is, we often hear, “a route, always switching” is the principle.
Comparison with the router Some would ask, with three switches routers also do? Of course, it does not have the router function. Type of multi-port router to support more than three-tier protocol, routing capability, it is suitable for large interconnection networks, switches and even though a lot of three-layer switch has a heterogeneous network interconnection port, it is generally large network of interconnect port small, connected devices is not the main function of the rapid exchange between the port, but to choose the best path to load sharing, link backup and the most important routing information with other networks exchange, all of which are functions of the router to complete.
Three changes in the exchange of technology and
As application environment are facing a huge change, so even if the exchange of technology in three very mature now, three switches have never stopped its development.
Over time, technology, Ethernet transmission speeds from 10Mbps gradually extended to 100Mbps, 1Gbps, or even higher, the price of Ethernet economies of scale and rapid decline followed. Today, Ethernet has become a local area network (LAN) in the dominant network technology, and with the emergence of Gigabit Ethernet, Ethernet is the MAN (MAN) a big step forward, we can see the market expanding application environment to the deeper layer switching technology provides a broad change in the space.
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