The QFX3500 switch will not upgrade to 12.1X49, and later Junos versions, if it is running a Uboot version (Jloader) 1.1.1 (or earlier). You must upgrade to jloader version 1.1.2, or higher, in order to upgrade to Junos 12.1, or later Junos releases.
The QFX3500 switch will not upgrade to 12.1X49, and later Junos versions, if it is running a Uboot version (Jloader) 1.1.1 (or earlier). You must upgrade to jloader version 1.1.2, or higher, in order to upgrade to Junos 12.1, or later Junos releases.
Earlier jloader versions prior to 1.1.2 are not compatible with Junos 12.1, and later Junos releases. The QFX3500 switch will not upgrade to 12.1X49, and later Junos versions, if it is running a Uboot version (Jloader) 1.1.1 (or earlier). You must upgrade to jloader version 1.1.2, or higher, in order to upgrade to Junos 12.1, or later Junos releases.
1. Check the Uboot version running on the QFX3500 by using the following command:
root@QFX3500-R32# run show chassis firmware Part Type Version FPC 0 U-Boot 1.1.6 (May 8 2011 - 03:58:10) 1.1.1 <=====jloader version 1.1.1 --- must upgrade to jloader 1.1.2 (or later) to install Junos releases 12.1, or later loader FreeBSD/MIPS U-Boot bootstrap loader 0.1
2.Upgrade the QFX3500 switch if it is running a jloader firmware (Uboot) code of 1.1.1, or earlier.
- Please refer to following KB21084 article for the jloader firmware (Uboot) upgrade procedure for the QFX3500, and jloader images, for the QFX3500
QFX3500 Jloader Firmware Upgrade Procedure
http://kb.juniper.net/InfoCenter/index?page=content&id=KB21084&actp=search&viewlocale=en_US&searchid=1333734177310 - Please refer to the following PSN notifications for jloader version 1.1.2
Passive DAC Interfaces, for port range 6-41, takes time to be declared DOWN when remote end is DOWN (Jloader 1.1.2)
http://www.juniper.net/alerts/viewalert.jsp?actionBtn=Search&txtAlertNumber=PSN-2011-11-434&viewMode=view