JUNOS Internet Software Network Operations Guide: Hardware
136 ! Monitoring the Routing Engine Status
If the router boots from an alternate boot device, the JUNOS software 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 (/
dev/ad2s1a):
login: username
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 Storage Media
The router has three forms of storage media:
! Flash drive, which is a nonrotating drive. When a new router is shipped from
the factory, the JUNOS software is preinstalled on the flash drive.
! Hard disk, which is a rotating drive. When a new router is shipped from the
factory, the JUNOS software 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 the JUNOS software.
Table 43 on page 154 shows the storage media device names (as of JUNOS release
5.x and above) by Routing Engine type.
See Also ! “Host Redundancy Overview” on page 463
! “Monitoring Redundant Routing Engines” on page 491
Monitoring the Routing Engine Status
For information about conditions that trigger Routing Engine alarms, see “Display
the Current Router Alarms” on page 61.
Steps To Take To monitor the Routing Engine status, follow these steps:
1. Check the Detailed Routing Engine Status on page 137
2. Check the Routing Engine LEDs on page 138
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