Huawei CR52-SRUA Manuale utente

Quidway® NetEngine 40E Core Router Switch and Route Processing Unit

http://www.huawei.com/products/datacomm/ 1

Quidway® NetEngine 40E Core Router

Switch and Route Processing Unit

Overview

The Switch and Route Processing Unit (SRU) is the core of the Quidway® NetEngine 40E Core

Router (“NE40E” hereinafter).

The NE40E has altogether 12 slots, two of which are for SRUs. The SRU supports hot plugging.

Each NE40E must be configured with one or two SRUs. It is recommended that two SRUs be

configured to implement redundant backup and raise the system reliability. Each SRU must be

configured with one or two Compact Flash (CF) cards (512MB) and memory cards(1GB). It is

recommended that two CF cards and two memory cards be configured to enhance the overall

performance of the system.

CR52-SRUA

The SRU mainly consists of the Main Processing Unit (MPU) and the Switch Fabric Unit (SFU). In

addition, it integrates the synchronous clock module (SYN), the line clock module (CLK), the

management communication module (MCX) and the CF card module. It is an integration of multiple

functional modules. As the system control and management center, and the system clock source

and maintenance&management unit, the SRU board completes control plane and system

maintenance plane functions.

The detailed functions are as follows:

1. System control and management center

zRouting protocol execution

All the routing protocol packets are sent by the forwarding engine to the SRU board for

processing. The SRU board also broadcasts and filters routing packets and executes routing

policies.

Quidway® NetEngine 40E Core Router Switch and Route Processing Unit

http://www.huawei.com/products/datacomm/ 2

zOut-band communication path among the boards of the entire system

The SRU board integrates the LAN Switch module to provide inter-board out-band

communication for various boards. It completes control, maintenance and message exchange

among the SRU, SFU and Line Processing Unit (LPU).

zEquipment management and maintenance function

zData configuration function

The system configuration data, boot file, charging information, upgrade software and system

operation log are all saved on the SRU board. The SRU board provides a CF card interface as

a mass storage device to save data files.

zReliability guarantee

In view of reliability, the 1+1 redundant backup mode is adopted for the MPUs. The MPUs

monitor each other’s status. Once the active MPU is faulty, the standby MPU automatically

becomes active.

2. Component of the system switching network

Two SFU modules integrated on the SRU and two SFU boards together form four switching planes

that implement 3+1 load sharing.

3. System clock unit

The SRU board provides Synchronous Digital Hierarchy (SDH) interface clock signals of high

precision and high reliability to various line boards. It provides two 2.048MHz synchronous clock

signals to the downstream equipment and may receive external 2.048MHz or 2.048Mbps reference

clock.

4. Switching synchronous clock unit

It ensures the synchronization of the working clocks of the switching network and various line

boards.

5. System maintenance unit

This board collects the operating data of various system units via the monitoring bus, and

generates control information according to the operating states of these units. Such control

information concerns board in-position detection, switching network operating status control, fan

speeding up, and so on. The 1+1 hot backup mode is adopted for the MPU, clock and LAN Switch

modules of the board, which raises the system reliability.

Specifications

Currently, the NE40E provides one type of SRU: CR52-SRUA. The CR52-SRUA board provides

multiple external interfaces. Its specifications and functions are described in the following table:

Quidway® NetEngine 40E Core Router Switch and Route Processing Unit

http://www.huawei.com/products/datacomm/ 3

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.

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 the

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

CR52-SRUA

CLK-OUT2 SMB Used to output the 2.048MHz or

2.048Mbps clock to the downstream

equipment.

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