Monitor The Routing Engine Status - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

Documentation

Routing Engine Storage Media

Documentation

Monitor the Routing Engine Status

If the CompactFlash card fails, the router attempts to boot from the hard disk, which is

the alternate boot device.

If a removable media is installed when the router boots, the router attempts to boot the

image on it. If the booting fails, the router tries the flash drive and then the hard disk.

If the router boots from an alternate boot device, the Junos OS displays a message

indicating this when you log in to the router. For example, this message shows that the

software booted from the hard disk (/

Password: password

Last login: date on terminal

--- JUNOS 6.4 R1 built date

--- NOTICE: System is running on alternate media device (/dev/ad1).

Routing Engine Overview on page 168

The router has three forms of storage media:

Flash drive, which is a nonrotating drive. When a new router is shipped from the factory,

Junos OS is preinstalled on the flash drive.

Hard disk, which is a rotating drive. When a new router is shipped from the factory,

Junos OS is preinstalled on the hard disk. This drive is also used to store system log

files and diagnostic dump files.

Removable media, either a PC card or an LS-120 floppy disk. The removable media

that ships with each router contains a copy of Junos OS.

"Check the Router File System and Boot Disk" on page 201

names (as of Junos OS release 5.x and above) by Routing Engine type.

Routing Engine Overview on page 168

To confirm that the routing engine is functioning properly.

For information about conditions that trigger Routing Engine alarms, see

Current Router Alarms" on page

To monitor the Routing Engine status:

Check the Detailed Routing Engine Status on page 179

Check the Routing Engine LEDs

shows the storage media device

"Display the