Boot Sequence on ACX Series Routers
The router attempts to boot from the storage media in the following order:
1. USB storage media device.
2. Dual, internal NAND flash device (first da0s1, then da0s2).
Related
Documentation
Dual-Root Partitioning ACX Series Routers Overview on page 48•
• Understanding How the Primary Junos OS Image with Dual-Root Partitioning Recovers
on the ACX Series Router on page 49
Dual-Root Partitioning ACX Series Routers Overview
Dual-root partitioning allows the ACX Series router to remain functional even if there is
file system corruption and to facilitate easy recovery of the file system. Dual-root
partitioning means that the primary and backup Junos OS images are kept in two
independently bootable root partitions. If the primary root partition becomes corrupted,
the system can still boot from the backup Junos OS image located in the other root
partition and remain fully functional.
NOTE: ACX5048 and ACX5096 routers do not support dual-root partitioning.
All other ACX routers run with dual-root partitioning.
This section contains the following topics:
•
Boot Media and Boot Partition on the ACX Series Routers on page 48
•
Important Features of the Dual-Root Partitioning Scheme on page 49
Boot Media and Boot Partition on the ACX Series Routers
With dual-root partitioning, the ACX Series router first tries to boot the Junos OS from
the primary root partition and then from the backup root partition on the internal NAND
flash. If both primary and backup root partitions of the internal NAND flash fail to boot,
you must insert a USB storage media with a copy of the Junos OS from which to boot.
The following is the storage media available on the ACX Series router:
•
USB media emergency boot device
NOTE: The USB media device is not dual-root partitioned.
•
Dual, internal NAND flash device (first daOs1, then daOs2)
Copyright © 2017, Juniper Networks, Inc.48
ACX Series Universal Access Router Configuration Guide
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