Control Plane; Introduction To The Control Plane - Huawei NE40E Hardware Description

NE40E
Hardware Description
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Board Name

1.10.2 Control Plane

1.10.2.1 Introduction to the Control Plane

This section describes the functions of the control plane.
The control plane of the NE40E-X16A is separated from the data plane and the monitoring
plane.
The MPU on the NE40E-X16A is responsible for system control and management, including
route calculation, device management and maintenance, and device monitoring.
System Control and Management Unit
As the system control and management unit, the MPU provides the following functions on the
system control panel:
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System Clock Unit
As the system clock unit, the MPU provides accurate and reliable SDH clock signals for
LPUs. The MPU can provide three-channel 2.048 MHz synchronous clock signals for the
downstream devices, or receive 2.048 MHz or 2.048 Mbit/s external reference clock signals.
To support IEEE 1588v2, that is, the Precision Time Protocol (PTP), the SDH clock interface
can input time information in multiple formats by selecting specific software.
System Maintenance Unit
As the system maintenance unit, the MPU collects monitored information to test system units
locally or remotely or perform in-service upgrades on system units.
The MPU periodically collects information about the operation of system units through the
monitor bus. The MPU then generates related control information based on the collected
information, for example, information collected by detecting board installations and adjusting
fan speed. Through the joint test action group (JTAG) bus, the MPU remotely or locally tests
system units or performs in-service upgrades on system units.
Issue 01 (2018-05-03)
Description
Indicates the name and associated information about a board.
Route calculation: All routing protocol packets are sent by the forwarding engine to the
MPU for processing. In addition, the MPU broadcasts and filters packets, and downloads
routing policies from the policy server.
Outband communication between boards: The LAN switch modules integrated on the
MPU provide outband communications between boards. In this manner, messages can be
controlled, maintained, and exchanged between SFUs and LPUs.
Device management and maintenance: Devices can be managed and maintained through
the management interfaces (serial interfaces) provided by the MPU.
Data configuration: The MPU stores configuration data, startup files, charging
information, upgrade software, and system logs.
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