Huawei CR52-MPUA User manual
Quidway® NetEngine 80E Core Router Main Processing Unit
Copyright ©2007 Huawei Technologies Co., Ltd. All rights reserved.
http://www.huawei.com/products/datacomm/ 1
Quidway® NetEngine 80E Core Router
Main Processing Unit
Overview
Main Processing Unit (MPU) is the core of the Quidway®NetEngine 80E core router (“NE80E”
hereinafter).
The NE80E provides 22 slots in total, two of which are reserved for the MPU. MPU supports hot
swapping. It is suggested that you configure two MPUs in order to implement MPU redundancy and
enhance the system reliability. Each MPU needs to be configured with one or two Compact Flash
(CF) cards (512MB) and memory (1GB). It is suggested to configure two CF cards and memory for
improving the system performance.
CR52-MPUA
MPU is integrated with the clock module, LAN Switch module and CF card. As the core of system
control and management, MPU also serves as system clock source and maintenance and
management unit. It implements the functions of control and system maintenance planes.
The detailed functions are as follows:
zExecute routing protocols:
All routing protocol packets are sent by the forwarding engine to MPU for processing. The MPU
updates routing entries and load forwarding tables to the forwarding engine. In addition, the
MPU also is responsible to broadcast and filter routing packets and download routing policies
from the policy server.
zExecute the signaling protocols.
zProvide out-of-band channels for the communication between boards.
This function is attributed to the LAN Switch module and aimed to control, maintain and
exchange information between MPU, Switching Fabric Unit (SFU) and Line Processing Unit
(LPU).
zProvide level-3 clock and the reference clock of the switching network.
It provides service and interface boards with high-precision and high-reliability SDH clock
Quidway® NetEngine 80E Core Router Main Processing Unit
Copyright ©2007 Huawei Technologies Co., Ltd. All rights reserved.
http://www.huawei.com/products/datacomm/ 2
signals (38.388MHz). The clock module sends 2-channel 2.048MHz or 2.048Mbit/s
synchronization clock signals to lower-level equipment as it receives the 2.048MHz or
2.048Mbit/s clock reference.
zMonitor the running status of the system.
MPU collects the running data of units periodically and generates the control information,
including detecting whether boards are in position, controlling the running status of the
switching network and speeding up fans.
zManage and maintain equipment.
zConfigure data:
MPU is a storage place for system configuration data, boot files, billing information, upgraded
software and system running logs. Providing an interface for the CF card, MPU also functions
as a storage device to store data files.
zEnsure reliability:
MPU works in the 1+1 backup mode. Active and standby MPUs monitor each other. The
standby MPU takes over services when the active one gets faulty. MPU, clock module and LAN
Switch module are all designed with 1+1 hot backup, which enhances the system reliability.
Specifications
Currently the NE80E provides one type of MPU: CR52-MPUA. CR52-MPUA provides multiple
external interfaces whose specification and functions are described in the table below.
Module Name Interface
Name Interface type Description
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.
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.
CR52-MPUA
Console port RJ45 RS-232 level; used to connect the
console and implement on-site
configuration of the system.
Quidway® NetEngine 80E 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
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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