Hi There,
I am in the process to upgrade an mx960.
Upgrade path:
Start sw version installed: JUNOS 16.1R5-7
Intermediate sw version: JUNOS 18.1R2-6
Final sw version: JUNOS 18.4R3
Question: what about rollback/downgrade?
I am preparing the following strategy:
Start from: JUNOS 16.1R5-7
1)take snapshot: request system snapshot
2)Prepare recovery bootdevice for version JUNOS 18.1R2-6
3)Save on my usb the juniper.conf.gz
Upgrade: from JUNOS 16.1R5-7 to JUNOS 18.1R2-6
In case of problem when i install the JUNOS 18.1R2-6, is enough to run the command "request system reboot partition alternate" to have the router back to his original OS+Config
Upgrade: from JUNOS 18.1R2-6 to JUNOS 18.4R3
Create and emergency boot device (jinstall-media for 18.1R2-6) + config saved on my usb
In case of problem i will:
- Use the emergency boot device to bring the OS back to 18.1R2-6
- Use the config file to manually load it
Question: do you have any better idea to cover the part with regard problem?
Is the usage of request system reboot partition alternate correct? I read this:
"When the correct snapshot command is issued, the /root file system is backed up to /altroot, and /config is backed up to /altconfig. The /root and /config file systems are on the devices’s CompactFlash card, and the /altroot and /altconfig file systems are on the devices’s hard disk or or solid-state drive (SSD)."
so I am assuming that the sw upgrade is never modify/deleting the content of devices’s hard disk or or solid-state drive (SSD) where /altroot and /altconfig are saved.
Thanks.