The circuit board is divided into three large categories according to the number of layers: single panel, double panel, and multi-layer circuit board.
The first is a single panel, in the most basic PCB, the parts are concentrated in one side, the wire is concentrated in the other side. Because the wire only appears in one side, this PCB is called a single-sided circuit board. Single panel is usually simple to make, low cost, but the disadvantage is that it can not be applied to too complex products.
Dual panel is an extension of the single panel, when the single-layer wiring can not meet the needs of electronic products, it is necessary to use dual panel. Both sides are covered with copper wires, and the group can pass through the line between the two layers through the hole to form the required network connection.
Multilayer board refers to a printed board with more than three layers of conductive graphics layer and the insulating material between them to separate layers, during which the electrical graphics are interconnected according to requirements. Multilayer circuit board electronic information technology to high speed, multi-function, large capacity, small size, thin shape, lightweight imitation to the development of the product.
According to the characteristics of the circuit board is divided into soft board (FPC), hard board (PCB), soft and hard combined board (FPCB).
Switch forwarding plane: The forwarding plane provides high-speed non-blocking data channels and implements service switching between service modules. The basic task of a switch is to process and forward different ports on the switch. Up.
Various types of data. Various specific data processing and forwarding processes such as L2/L3/ACL/QoS/ multicast/security protection belong to the task category of the switch forwarding plane.
Switch control plane: The control plane performs functions such as protocol processing, service processing, routing calculation, forwarding control, traffic scheduling, traffic statistics, and system security. The switch control plane is used for
Control and manage the operation of all network protocols. The control plane provides various network information and forwarding query entries required by the data plane before data processing and forwarding.
Switch management plane: The management plane performs functions such as system running status monitoring, environment monitoring, log and alarm processing, system loading, and system upgrade. The management plane of the switch is provided to the network.
Network administrators use TELNET, WEB, SSH, SNMP, RMON and other methods to manage devices, bottle, understand, and execute the Settings of various network protocols for network devices.
The parameters of various protocols on the control plane must be preset on the management plane so that the technical personnel can intervene in the operation of the control plane when necessary.
In the implementation of Huawei products, some products divide the function combination into data plane, management plane, and monitoring plane.
Control plane
The control plane of the device consists of the main control board and the management unit of the interface board.
The control management plane completes the control and management function of the system and is the central nervous system of the whole system. The control plane performs protocol processing, service processing, routing calculation, forwarding control, and service scheduling
Traffic statistics, system security and other functions. The control plane of a switch is used to control and manage the running of all network protocols. The control plane provides various network messages required for data processing and forwarding on the data plane
Breath and forward query entry.
