Huawei CR52-MPUA Manuale utente

Quidway® NetEngine 5000E Core Router Main Processing Unit

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

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

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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