Mx480 Routing Engine Overview; Mx480 Routing Engine Description - Juniper MX480 Hardware Manual

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MX480 Routing Engine Overview

MX480 Routing Engine Description

Copyright © 2011, Juniper Networks, Inc.
Table 4: Switch Control Board LEDs (continued)
Label Color
Green
FABRIC
ONLY
–
OK/FAIL Green
Red
–
Each SCB also has two LEDs on the craft interface that indicate its status. The SCB LEDs,
labeled and , are located along the bottom of the craft interface. For more information
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about the SCB LEDs on the craft interface, see
on page 31.
MX480 Switch Control Board (SCB) Description on page 21
MX480 Host Subsystem Description on page 20
Replacing an MX480 SCB on page 166
MX480 Routing Engine Description on page 23
RE-S-1800 Routing Engine Description for MX Series on page 25
RE-S-1800 Routing Engine LEDs on page 27
MX480 Routing Engine LEDs on page 27
The Routing Engine is an Intel-based PC platform that runs Junos OS. Software processes
that run on the Routing Engine maintain the routing tables, manage the routing protocols
used on the router, control the router interfaces, control some chassis components, and
provide the interface for system management and user access to the router.
You can install one or two Routing Engines in the router. The Routing Engines install into
the front of the chassis in horizontal slots in the SCBs labeled
Engines are installed, one functions as the master and the other acts as the backup. If
the master Routing Engine fails or is removed, and the backup is configured appropriately,
the backup takes over as the master.
The Routing Engines are hot-pluggable. Each Routing Engine must be installed directly
into an SCB. A USB port on the Routing Engine accepts a USB memory card that allows
you to load Junos OS.
Chapter 2: MX480 Hardware Components
State Description
On steadily SCB operates in fabric-only mode.
Off SCB operates in fabric/control board mode.
On steadily SCB is online.
On steadily SCB has failed.
Off SCB is offline.
"SCB LEDs on the MX480 Craft Interface"
and . If two Routing
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23