Huawei CR52-MPUA User manual
Quidway® NetEngine 5000E Core Router Main Processing Unit
Copyright ©2007 Huawei Technologies Co., Ltd. All Rights Reserved.
http://www.huawei.com/products/datacomm/ 1
Quidway® NetEngine 5000E Core Router
Main Processing Unit
Overview
The Main Processing Unit (MPU) is the core of the Quidway®NetEngine 5000E core router
(hereinafter referred to as "NE5000E").
The NE5000E has 22 slots, of which two are for MPUs. The MPU is hot-pluggable. One or two
MPUs are required for each NE5000E. It is recommended that two MPUs be configured to realize
redundancy backup and to improve the system reliability. In addition, each MPU should be
equipped with one or two CF cards (512 MB) and memory cards (1 GB). To improve the overall
performance of the system, you are recommended to configure two CF cards and two memory
cards.
CR52-MPUA
The MPU integrates the clock module, LAN Switch module and Compact Flash (CF) module. It is a
collection of multiple functional modules. The MPU is the core for system control and management.
In addition, as the system clock source and the maintenance management unit, the MPU
implements the functions of the control plane and system maintenance plane. Detailed functions
are given below.
zImplement routing protocol:
All routing protocol packets are delivered by the forwarding engine to the MPU for processing.
The MPU updates the routing table entries and downloads the forwarding table from the
forwarding engine. Also, the MPU broadcasts and filters routing packets and downloads
routing policies from the policy server.
zRun signaling protocol.
zProvide out-band communication channels between the boards in the whole system:
The MPU is integrated with a LAN Switch module, enabling out-band communication between
Quidway® NetEngine 5000E Core Router Main Processing Unit
Copyright ©2007 Huawei Technologies Co., Ltd. All Rights Reserved.
http://www.huawei.com/products/datacomm/ 2
boards. It also implements control, maintenance and message exchange among the MPU,
Switch Fabric Unit (SFU) and Line Processing Unit (LPU).
zProvide the level-3 clock and the reference clock of the switch fabric:
The MPU provides highly precise and reliable Synchronous Digital Hierarchy (SDH) line
interface clock signals (38.88 MHz) to service interface boards. Moreover, the clock module
provides two 2.048 MHz or 2.048 Mbps synchronous clock signals to downstream equipment
or receives external 2.048 MHz or 2.048 Mbps clock reference.
zMonitor system running status:
The MPU collects the running status data of system units regularly, and generates control
information accordingly, for example, detecting whether all boards are in position, controlling
the running status of the switch fabric and speeding up fans.
zManage and maintain equipment.
zConfigure data:
The system configuration data, boot file, charging information, upgrade software, and system
running logs are stored on the MPU. The MPU provides a CF card interface to store data files
as a mass storage device.
zGuarantee system reliability:
In view of reliability, the MPU adopts the 1 + 1 redundancy backup mode. In this way, the
active MPU and the standby MPU monitor the working status of each other. If the active MPU
is faulty, the standby MPU becomes active automatically. The main processing module, clock
module and LAN Switch module of the MPU also adopt 1+1 hot backup mode, improving the
reliability of the system.
Specifications
Currently, the NE5000E provides one type of MPU: CR52-MPUA. The CR52-MPUA has multiple
external interfaces. Its specifications and functions are listed below:
Module Name Interface
Name Interface type Description
CR52-MPUA ETH0 port RJ45
Used to connect the system
Network Management workstation.
It is 10/100/1000M adaptive and
supports a maximum transmission
distance of 100m. It provides LINK
and ACT indicators.
Quidway® NetEngine 5000E Core Router Main Processing Unit
Copyright ©2007 Huawei Technologies Co., Ltd. All Rights Reserved.
http://www.huawei.com/products/datacomm/ 3
Module Name Interface
Name Interface type Description
ETH1 port RJ45
Used for interconnection of multiple
chassis but currently reserved. It is
10/100M adaptive and supports a
maximum transmission distance of
100m. It provides LINK and ACT
indicators.
Console port RJ45 RS-232 level; used to connect the
console and implement on-site
configuration of the system.
AUX port RJ45 RS-232 level; used to connect the
Modem and implement remote
maintenance through dialing.
CF interface TYPE II standard
(compatible with
TYPE I standard)
Used to hold the CF card to save
data files. Standard configuration:
512MB
CLK-IN1
CLK-IN2 SMB Used to connect the external
2.048MHz or 2.048Mbps clock input.
CLK-OUT1
CLK-OUT2 SMB Used to output the 2.048MHz or
2.048Mbps clock to the downstream
equipment.
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