Huawei USG9580 Control Plane Descriptions
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Introduction to the USG9000

At present, the USG9000 can work in three modes: routed mode, transparent mode, and composite mode.
  • routing mode In routing mode, the USG9000 uses the layer 3 for external connections, and all interfaces must be assigned with IP addresses. When the USG9000 is located between the internal network and the external network, you need to configure the interfaces, through which the USG9000 is connected with the internal network and the external network, with IP addresses on different network segments and re-plan the network topology. In this case, the USG9000 serves as a router. As shown in Figure 2-1, the USG9000 is connected with the internal network through an interface in the Trust zone, while it is connected with the external network through an interface in the Untrust zone. Note that the interface in Trust zone and the interface in Untrust zone reside in different two subnets.
    Figure 2-1  Networking in routing mode
    When working in routing mode, the USG9000 can complete ACL packet filtering. However, network topology needs to be changed. For example, internal network users need to change their gateways and routers’ routing configurations need to be changed.
  • transparent mode In transparent mode, the USG9000 uses the layer 2 for external connections, and none of the interfaces can be assigned with IP addresses. In this case, the USG9000 is transparent to users in subnets and routers. That is, users do not feel the existence of the USG9000. As shown in Figure 2-2, the USG9000 is connected with the internal network through interfaces in the Trust zone, while it is connected with the external network through interfaces in the Untrust zone. Note that the internal network and the external network must reside in the same subnet.
    Figure 2-2  Networking in transparent mode
    If the USG9000 works in transparent mode, you do not need to change network topology. In transparent mode, you only need to place the USG9000 in the network like placing a bridge without need of modifying any existing configuration. Similar to the routing mode, IP packets also need to be filtered and checked in transparent mode, and internal users can be protected by the USG9000.
  • composite mode If there are both interfaces working in routing mode (such interfaces have IP addresses) and interfaces working in transparent mode (such interfaces have no IP address) in the USG9000, the USG9000 is working in composite mode. Composite mode is applied in the case of dual-system hot backup with transparent mode. The interface on which VRRP is enabled needs to be configured with an IP address, and other interfaces do not. Figure 2-3 shows a typical networking in composite mode.
    Figure 2-3  Networking in composite mode
    Master and backup USG9000s are connected with the internal network through interfaces in the Trust zone, while they are connected with the external network through interfaces in the Untrust zone. In addition, master and backup USG9000s connect each other and perform hot standby through VRRP. Note that the internal network and the external network must reside in the same subnet.

    Introduction to the Control Plane

    This section describes the functions of the control plane. The control plane on the USG9580 is responsible for system control and management, including route calculation, device management and maintenance, and device monitoring. USG9580 uses the MPUB and CMU to implement the system control and management functions of the control plane. The functions include route calculation and device management, maintenance, and monitoring. The functions are described as follows:

    System Control and Management Unit

    As the system control and management unit, the MPUB provides the following functions on the system control panel:
    • Route calculation: All routing protocol packets are sent by the forwarding engine to the MPUB for processing. In addition, the MPUB broadcasts and filters packets, and downloads routing policies from the policy server.
    • Outband communication between boards: The LAN switch modules integrated on the MPUB 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 MPUB.
    • Data configuration: The MPUB stores configuration data, startup files, charging information, upgrade software, and system logs.
    • Data storage: The MPUB provides two interfaces for CF cards, which serve as mass storage devices to store data files.

    System Maintenance Unit

    As the system maintenance unit, the MPUB collects monitored information to test system units locally or remotely, or implement in-service upgrading of system units. The MPUB periodically collects information about the operation of system units through the Monitorbus. The MPUB then generates related control information based on the collected information, for example, the detection of board installations and adjustments to fan speed. Through the joint test action group (JTAG) bus, the MPUB remotely or locally tests system units, or performs in-service upgrades of system units.

    Reliability

    The main control modules, clock modules, and LAN switch modules on the MPUB work in 1:1 hot backup mode, thus improving system reliability. The two MPUBs work in 1:1 backup mode. Each MPUB monitors the status of the other. If the master MPUB is faulty, the slave MPUB automatically takes over as the master MPUB.