Hi SalmanSaeed,
1. MPU (Main Processing Unit): The main control board is the nerve center of the router, which is equivalent to the human brain. The main control board is like the management of the post office and is not responsible for specific express mail processing (packet forwarding). The configuration router is interpreted by the main control board and then passed to the interface board.
2. LPU (Line Processing Unit): Interface board, line processing unit. There are many interfaces on the interface board. Data packets are received and sent through the interface board, and the communication cable must be plugged into the interface of the interface board.
3. SPU (service process unit): service board, service processing unit. Provide the switch with load balancing, firewall, NAT, IPSec (IP Security), NetStream, and other business functions. Relatively rare.
4. SFU (Switch Fabric Unit): Switch fabric unit. To send packets from one interface to another interface, you need to connect these two interfaces. But in fact, the message may come in from any interface, and go out from any interface. If the connection is so point-to-point, too many cables are needed. In order to solve the problem of such a large number of connections, a switching network board has appeared. As long as the interface board is connected to it, it can complete the intercommunication of any interface. The switching network board is one of the core components that determine the performance of the router. The switching network board is equivalent to the sorting center of the post office. The interface board collects the data, concentrates it on the switching network board for sorting and processing, and then sends it out by the interface board. Its effective and timely diversion capability plays a key role in router performance.
5. The PMU(Power Monitoring Unite) is used to manage power modules and power access modules, monitor their working status and report to the host.
These are the functions of common boards and PMUs.
