Classification of vro System Structure

From the perspective of system construction, routers can be divided into the first generation of Single-CPU router, the second generation of Single-bus master-slave CPU router, the third generation of Single-bus symmetric multi-CPU router, the fourth generation of Multi-bus multi-CPU router, the fifth generation of shared memory structure vro, the sixth generation interspersed switch system to build vrouters and vrouters Based on the cluster system.

Routing has four elements: input port, output port, AC switch, and Route Processor.

The input port is the entrance of the physical link and input package. Each port is supplied by a line card. A line card supports 4, 8, or 16 ports. An input port has many functions.

● The first function is to encapsulate the width and encapsulation of the data link layer.

● The second function is to search for the destination address of the input package in the forwarding statement and then determine the destination port (called route query). The Routing Query can be completed using common hardware, it may be done by embedding a microprocessor on each wire card.

● Third, in order to provide QoS (Service Quality), the port should divide the received packet into several pre-defined service levels.

● Fourth, the port can need to run such as SLIP (Serial Line Internet peace talks) and PPP (point-to-point peace talks) such data link level peace talks may be such as PPTP (Point-to-Point authentic peace talks) such network level peace talks. Once the route query is complete, you must use the AC switch to send the packet to its output port. If the router is added to a queue at the input end, several inputs share a unified AC switch. The final function of such input port is to participate in the arbitration and negotiation of public capital (such as the exchange switch.

The communication switch can be completed using a variety of different skills. So far, the most widely used communication switch skills are bus, interspersed switch and shared storage. The most simple switch uses a bus to connect all input and output ports. The defect of the bus switch is that its AC capacity is limited by the capacity of the bus and the rated expenditure for shared bus arbitration.

The interspersed switch is supplied with multiple data channels through the switch. The interspersed switch with N x N interspersed points can be thought to have 2N bus. If a plug-in is closed, the data on the input bus is available on the output bus, otherwise it will not work. The closure and opening of the interspersed points are controlled by the regulator. Therefore, the regulator limits the speed of the AC switch.

In the shared storage device router, the incoming package is stored in the shared storage device, the exchange is only a pointer to the package, which improves the exchange capacity. However, the switch speed is limited by the storage device access speed. Although the storage capacity can double every 18 months, the storage access time is reduced by only 5% every year, which is an inherent limitation of the shared storage AC switch.

The output port stores packets before the packets are sent to the output link. It can complete complex scheduling algorithms to support priority and other requirements. Like the input port, the output port must support encapsulation width and encapsulation of the data link layer, as well as many high-level peace talks.

Route Processor accounting announced the completion of the route talks, and the operation of the router equipment and management software. In addition, it also handles packages whose target addresses are not included in the wire card transfer announcement.

Wireless Network Router

A wireless network router is a communication device used to connect wired and wireless networks. It can send and receive wireless signals through Wi-Fi skills to communicate with digital assistants and laptops and other devices. A wireless network router can easily establish a computer network without cables.

However, when data is transmitted through wireless networks outdoors, its speed can be affected by the sky. Other wireless networks include infrared, Bluetooth, and Satellite microwave.

Routers play an important role in the accounting machine network and serve as a bridge to the accounting machine network. It can not only connect different networks, but also select data transmission channels and block illegal visits.