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I have tried to upgrade our EX4600 stack .
You will find below, the error log feedback during both types of upgrade attempts on this stack.
--- "NSSU upgrade" ---
root@SW-EX4600> request a non-stop software upgrade to /var/tmp/jinstall-ex-4600-17.3R3-S8.1-signed.tgz
Chassis Check DONE
[Jan 21 16:29:42]:ISSUE: Image validation
[21 Jan 16:29:42]:ISSUE: Preparing Backup RE
Install image on other FPC with backup
[Jan 21 16:29:56]: Software Image Recovery. This process can take several minutes. Be patient.
Retrieving version and model information from/var/tmp/jinstall-ex-4600-17.3R3-S8.1-signed.tgz
Download completed for package/var/tmp/jinstall-ex-4600-17.3R3-S8.1-signed.tgz
Push the beam to fpc1
ERROR: Cannot install jinstall-ex-4600-17.3R3-S8.1-signed on ex4600-40f
error: fpc1 response failed to read
error: DUE Aborted! RE backup may be in an inconsistent state, Please restore RE backup
[Jan 21 16:36:10]:ISSUE: Error
Abandoned MADE chassis
[Jan 21 16:36:10]:ISSUE: IDLE
--- "upgrade standard" ---
root@SW--EX4600> system software request add/var/tmp/jinstall-ex-4600-15.1R7.8-domestic.tgz
Check pending installation on fpc1
Check pending installation on fpc0
Push the /var/tmp/jinstall-ex-4600-15.1R7.8-domestic.tgz package to fpc1
Validation on fpc1
ERROR: Cannot install jinstall-ex-4600 on ex4600-40f
Can you tell us what was the problem and how to fix it?