Juniper SRX 5600, SRX 5800, SCB Installation Instructions Manual

SRX 5600 and SRX 5800
Services Gateway
Switch Control Board
Installation Instructions

August 2008
Part Number: 530-026269-01
Revision 01

This document describes how to remove and replace a Switch Control Board (SCB)
on a Juniper Networks SRX 5600 and SRX 5800 services gateway. The illustrations
in this document show the SRX 5800 services gateway, but the instructions apply to
all SRX 5600 and SRX 5800 services gateways.

Contents

Switch Control Board .......................................................................................2

Replacing an SCB ............................................................................................4

Preventing Electrostatic Discharge Damage ....................................................8

Electrostatic Discharge Point ...........................................................................9

List of Technical Publications ........................................................................10

Requesting Technical Support .......................................................................11

Revision History ............................................................................................12

SCB Slots ...................................................................................................2

SCB Redundancy ......................................................................................3

SCB Components ......................................................................................3

SCB LEDs ..................................................................................................3

Powering Off the Services Gateway ..........................................................4

Operating and Positioning the SCB Ejectors ..............................................5

Removing an SCB .....................................................................................5

Installing an SCB .......................................................................................6

■ 1

SRX 5600 and SRX 5800 Services Gateway Switch Control Board Installation Instructions

Switch Control Board

The Switch Control Board (SCB) provides the following functions:

■ Powers on and powers off IOCs and SPCs

■ Controls clocking, system resets, and booting

■ Monitors and controls system functions, including fan speed, board power status,

PDM status and control, and the system front panel

■ Provides interconnections to all the IOCs within the chassis through the switch

fabrics integrated into the SCB

When the SCB is part of a host subsystem, the Routing Engine installs directly into
a slot on the SCB (see Figure 1 on page 2).

Figure 1: SCB

SCB Slots

You must install at least one SCB in the services gateway as part of a host subsystem.

The SCBs install into the front of the chassis in the slots labeled 0 and 1 on an SRX
5600 services gateway and 0, 1, and 2/6 on an SRX 5800 services gateway. If any
slots are empty, you must install a blank panel.

2 ■ Switch Control Board

SCB Redundancy

If two SCBs are installed in an SRX 5600 services gateway, one SCB functions as the
master SCB and the other as its backup. If the master fails or is removed, the backup
becomes the master.

On SRX 5800 services gateways, SCBs installed in slots 0 and 1 provide nonredundant
fabric connections. A third installed SCB in slot 2/6 provides fabric redundancy but
no additional control or routing functions.

Table 1: SCB Slot Mapping and Functionality

Switch Control Board

SRX 5800 Services GatewaySRX 5600 Services GatewayFunctionality

Full fabric (nonredundant)

Redundant fabric

SCB Components

SCBs in slot 0 and slot 1SCB in slot 0

SCBs in slot 0, slot 1, and slot 2/6SCBs in slot 0 and slot 1

Each SCB consists of the following components:

■ Chassis management Ethernet switch.

■ I2C bus logic, used for low-level communication with each component.

■ Component redundancy circuitry.

■ Control Board/Routing Engine mastership mechanism.

■ Gigabit Ethernet switch that is connected to the embedded CPU complex on all

components.

■ Switch fabric—Provides the switching functions for the I/O cards (IOC)s.

■ Control FPGA—Provides the Peripheral Component Interconnect (PCI) interface

to the Routing Engine.

■ 1000Base-T Ethernet controller—Provides a 1-Gbps Ethernet link between the

Routing Engines.

■ Ethernet switch—Provides 1-Gbps link speeds between the Routing Engine and

the IOCs.

■ Circuits for chassis management and control.

■ Power circuits for the Routing Engine and SCB.

■ LEDs—Provide status (see “SCB LEDs” on page 3).

SCB LEDs

Three LEDs on the SCB indicate the status of the SCB. The LEDs, labeled FABRIC

ACTIVE, FABRIC ONLY, and OK/FAIL, are located directly on the SCB. Table 2 on page

4 describes the functions of the SCB LEDs.

Switch Control Board ■ 3

SRX 5600 and SRX 5800 Services Gateway Switch Control Board Installation Instructions

Table 2: Switch Control Board LEDs

DescriptionStateColorLabel

Replacing an SCB

FABRIC
ACTIVE

FABRIC
ONLY

OK/FAIL

Fabric is in active mode.On steadilyGreen

SCB operates in fabric-only mode.On steadilyGreen

SCB operates in fabric/control board mode.Off

SCB is online.On steadilyGreen

SCB is offline.Off

SCB has failed.On steadilyRed

The services gateway can have up to three SCBs. They are located in the front of the
chassis in the slots marked 0 and 1 on an SRX 5600 services gateway and 0, 1, and

2/6 on an SRX 5800 services gateway. With a Routing Engine installed, the SCB

weighs approximately 9.6 lb (4.4 kg).

Before you replace an SCB or a Routing Engine, you must power off the services
gateway (see “Powering Off the Services Gateway” on page 4). To replace an SCB,
use the following procedures:

■ Powering Off the Services Gateway on page 4

■ Operating and Positioning the SCB Ejectors on page 5

■ Removing an SCB on page 5

■ Installing an SCB on page 6

Powering Off the Services Gateway

Before installing or removing SCBs you must power off the services gateway:

1. On the external management device connected to the Routing Engine, issue the

request system halt operational mode command. The command shuts down the

Routing Engine cleanly, so its state information is preserved.

Wait until a message appears on the console confirming that the operating system
has halted. For more information about the command, see the JUNOS System
Basics and Services Command Reference.

2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and

connect the strap to one of the ESD points on the chassis. For more information
about ESD, see “Preventing Electrostatic Discharge Damage” on page 8.

4 ■ Replacing an SCB

user@host> request system halt