Troubleshooting Components; T4000 Troubleshooting Resources Overview - Juniper T4000 Hardware Manual

CHAPTER 36

Troubleshooting Components

T4000 Troubleshooting Resources Overview

Copyright © 2018, Juniper Networks, Inc.
T4000 Troubleshooting Resources Overview on page 345
T4000 LED Overview on page 346
T4000 Alarm Messages Overview on page 347
Troubleshooting the T4000 Craft Interface on page 349
Troubleshooting the T4000 SCGs on page 349
Troubleshooting the T4000 Cooling System on page 351
Troubleshooting the T4000 Host Subsystems on page 354
Troubleshooting the T4000 Routing Engines on page 355
Troubleshooting the T4000 Control Boards on page 356
Troubleshooting the T4000 FPCs on page 358
Troubleshooting the T4000 PICs on page 363
Troubleshooting the T4000 Power System on page 363
Troubleshooting the T4000 SIBs on page 368
To troubleshoot a T4000 router, you use the Junos OS command-line interface (CLI),
LCD, alarms, devices connected to the alarm relay contacts, and LEDs on both the
components and craft interface.
LEDs—When the Routing Engine detects an alarm condition, it lights the red or yellow
alarm LED on the craft interface as appropriate. In addition, you can also use the
component-specific LEDs on the craft interface and on the faceplate of a component
to troubleshoot the router.
LCD—When a red or yellow alarm occurs, the cause of the alarm messages is displayed
on the craft interface LCD. Use the CLI to display more information about the alarm.
Alarm devices connected to the alarm relay contact—When a red or yellow alarm
occurs, it trips the corresponding alarm relay contact.
CLI—The CLI is the primary tool for controlling and troubleshooting hardware, Junos
OS, routing protocols, and network connectivity. CLI commands display information
from routing tables, information specific to routing protocols, and information about
network connectivity derived from the ping and traceroute utilities. For information
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