Huawei NE40E Hardware Description page 79

NE40E
Hardware Description
Logical Architecture
A router consists of the data and control planes, which implements addressing and forwarding.
In addition, the router has a monitoring plane, which helps ensure stable addressing and
forwarding performance. The three planes provide the following functions:

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Figure 1-3 illustrates the logical architecture of a router.
Figure 1-3 Logical architecture
Physical Architecture
The physical architectures of the data, control, and monitoring planes on a router are as
follows:

Issue 01 (2018-05-03)
Data plane: Similar to a mail collection center, the data plane provides interfaces that
send and receive packets on a router, whereas processing the packets at a high speed and
switching data packets inside the router. The data plane encapsulates packets,
decapsulates packets, processes Ethernet, Multiprotocol Label Switching (MPLS), IPv4,
and IPv6 packets, implements quality of service (QoS), schedules packets, and provides
various statistics.
Control plane: Similar to the mail query and distribution center, the control plane is the
central nervous system on a router. It uses system buses to control system units and
provide various functions. These functions allow the router to calculate routes, generate
LSPs, build multicast, unicast, and MPLS forwarding tables, processes protocols and
signalings, configure the routes, maintain the route status, monitor the system status, and
generate the system status report.
Monitoring plane: monitors the system environment and helps the data and control plane
operate stably and securely. The monitoring plane measures the power voltage, controls
the system power-on and power-off, monitors temperatures, and controls fan modules. In
addition, the monitoring plane isolates a fault if a unit fails to prevent the fault from
affecting other units on the router.
The arrow in the figure indicates the direction in which data flows are forwarded.
The data plane's forwarding function is implemented by the uplink and downlink line
processing units (LPUs) and a switch fabric unit (SFU) on the router.
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