Description

This article describes the content of the bios-autoupgrade.conf file used by the auto bios upgrade feature. For details regarding this feature, refer to documentation on Understanding BIOS Upgrades on SRX Series Devices.

Symptoms

The BIOS version listed in the  bios-autoupgrade.conf  file is the minimum supported version. If the current device has a BIOS version earlier than the minimum compatible version, then the auto BIOS upgrade feature upgrades the BIOS automatically to the latest version. The bios-autoupgrade.conf  is used for auto bios upgrade, but some devices are not listed in the file.

The following is example content of the file from Junos 15.1X49-D130, where SRX300 series and SRX550M does not appear in the list. 

root% cat /boot/bios-autoupgrade.conf
\$Id: $

#####################################################################
#
# Copyright (c) 2010, Juniper Networks, Inc.
# All rights reserved.
#
#####################################################################
# BIOS Autoupgrade rules
#
# Each row has
#     Product_Family <space> minimum compatible active BIOS version
#     <space> minimum compatible backup BIOS version
#
# For a product family,
#     active BIOS should be > mininum compatible active BIOS version
#     backup BIOS should be > mininum compatible backup BIOS version
####################################################################

#product  min-active  min-backup
srx100    2.7         2.7
srx210    1.5         1.5
srx240    1.5         1.5
srx650    1.5
srx220    1.9         1.9
 

Solution

Firmware of devices that are not in the list has compatibility to all versions of Junos releases which support these devices. If a new bios image is not compatible with a new Junos image, the minimum supported version is added to the list and auto bios upgrade will work.