MPU LPU and SFU Unit of Huawei Datacenter Device, What are the Difference?

Boards of Huawei Datacenter Device such as NE40E core router and modular switch can be divided into MPU, LPU, and SFU according to the function.

These devices are logically divided into the following three planes: data plane, control plane, and management plane.

• The data plane provides high-speed non-blocking data channels to implement service switching between service modules.
• The control plane performs the following functions: protocol processing, service processing, route calculation, forwarding control, service scheduling, traffic statistics, and system security.
• The management planemonitors the running status of the system, monitors the environment, processes logs, and alarms, loads the system, and upgrades the system.

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What is MPU?

The full name of the MPU is Main Processing Unit, that is, the main control board. Responsible for the control plane and management plane of the system, including route calculation, device management and maintenance, and device monitoring. As a system synchronization unit, it provides high-precision and high-reliability synchronization clock and time signals. The main control board is like the management layer of the post office and is not responsible for the specific express processing (packet forwarding) work. The MPU interprets the device configuration and then transmits it to the LPU.

CR5D0MPUD270 main control board

What is LPU?

The full name of an LPU is Line Processing Unit, which is also called an interface board. The interface board with many interfaces is the interface board. Data packets are received and sent through the interface board. Communications cables must be connected to the interfaces of the interface board. The interface board provides different types of interfaces (such as optical and electrical interfaces) and different rates (such as 1000 Mbit/s, 10 Gbit/s, 25 Gbit/s, 40 Gbit/s, and 100 Gbit/s).

CR5D0EKGFA72 interface board

What is SFU?

The full name of the SFU is Switch Fabric Unit, that is, the switch blade. To send packets from one interface to another interface, you need to connect the two interfaces. In practice, however, packets may come in from any interface and go out from any interface. If the point-to-point connection mode is used, too many connection cables are required. To solve the problem of a large number of connections, a switch blade is created. An interface board can communicate with each other by connecting to the switch blade with only one cable. The switch blade is one of the core components that determine the device performance. The switch blade functions as the sorting center of the post office. The interface blade collects data, sends the data to the switch blade for sorting, and then sends the data to the interface blade. Its efficient and timely offloading capability plays a key role in device performance.

CR5DSFUIE07C switching board

In addition, the device has other boards, such as Filler Panel, SRU, and SPU.

Filler panels are used to fill vacant slots for boards or sub-cards and provide electromagnetic shielding to ensure that the chassis meets electromagnetic radiation requirements. Fill vacant slots to ensure proper airflow for the chassis cooling system. Prevent dust or foreign objects from entering the chassis. Prevent internal circuits from being exposed.

The SRU is a routing and switching board. It is composed of the MPU and SFU. Provides the control plane, management plane, and service switching plane of the entire system.

CR5D0SRUA570 Routing and Switching Board

The SPU is a service processing unit. Provides load balancing, firewall, NAT, IPSec, and NetStream services for devices.