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ME60 V800R010C10SPC500 Hardware Description

This is ME60 V800R010C10SPC500 Hardware Description
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Signal Flow on the Control Plane

Signal Flow on the Control Plane

The control plane, functioning as the nerve center, integrates control and management functions and uses buses to control system units.

The control plane consists of control units on MPUs and those on other boards. Each MPU is comprised of the following three functional units:
  • System management and control unit and system clock unit: work on the control plane.
  • System maintenance unit: works on the monitoring plane. For more information, see section "Signal Flow on the Monitoring Plane" in this document.
MPU units and board units communicate through system buses and the SFU.

Signal Flow on the Control Plane

Figure 6-2 illustrates the principles of signal flow transmission on the control plane.

Figure 6-2 Signal flow transmission on the control plane

The control plane processes the following signal flows:
  • Singling signal flow and operation and maintenance signal flow: processed by the system management and control unit.
  • Clock signal flow: processed by the system clock unit.
The signal flow on the control plane is bidirectional.
  • Signal flow contains host packets carrying signals, for example, routing protocols.
    • Board-to-MPU signal flow: calculates data. Therefore, a board sends these packets to the MPU, and the management and control unit on the MPU parses these packets. Then the MPU delivers signaling to the data plane so that they can be identified by the data plane.
    • MPU-to-board signal flow: used to update entries in forwarding tables. After the MPU delivers parsed data to a board, the board uses the data to forward packets on the data plane.

    In the following example, routing calculation is used. A packet arrives at an interface of a board. The network processor (NP) on the board identifies the packet that needs to be sent to the MPU. The NP sends the packet to the MPU. The MPU calculates the packet and delivers the destination IP address and the next-hop IP address to the routing table on the NP. The data plane forwards the packet to the next-hop address over a route to the destination IP address.

  • Operation and maintenance signal flow: Operation data includes configuration, debugging, and query data. Maintenance data includes system-generating data, such as logs and alarms.
    • Board-to-MPU signal flow: contains maintenance signals. The system management and control unit uses the system buses to collect maintenance information, such as logs and alarms that are generated by modules and saves the information in an information center. The maintenance data helps query and maintain the device.

      For example, when a user wants to query active alarms, the user runs the display alarm active command. The control plane parses this command and instructs the information center to display all collected active alarms.

    • MPU-to-board signal flow: contains operation signals. The control plane provides software interfaces to communicate with other devices, communication interfaces to communicate with host software, and LAN switch interfaces to communicate with other boards and modules. These interfaces form a logical network. Operation commands are configured on the control plane. The control plane then sorts information based on types and priorities and sends the information through interfaces along various channels to various modules.

      For example, a user runs the power off slot 1 command to power off a board in slot 1. The control plane parses the command and delivers the command through an outband interface to the board in slot 1.

  • Clock signal flow: contains synchronization Ethernet or 1588v2 (also called IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems) signals.
    • Board-to-MPU signal flow: used to obtain clock signals. An uplink board obtains clock frequency signals from packets and sends them to the system clock unit on an MPU. The system clock unit then selects a clock source.
    • MPU-to-board signal flow: used to restore the system clock frequency and time. After the MPU selects a clock source, it restores the synchronous system clock and delivers it to all boards so that a device forwards packets all carrying the synchronous signals to downstream devices through outbound interfaces.


Both the MPUs and clocks are working in 1:1 redundancy mode. The master and slave MPUs communicate and monitor each other's status. If the master MPU fails, the slave MPU automatically takes over packets and becomes the new master MPU, which improves device reliability.

Updated: 2019-01-04

Document ID: EDOC1100059474

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