Hi All,
I have the following question that basically is not answered clearly by any documentation)
Scenario: upgrade mx80 from JUNOS 16.1R5-7 to 18.4R3.
I want to go for the following upgrade-path:
Start sw version installed: JUNOS 16.1R5-7
Intermediate sw version: 17.2R3.4
Intermediate sw version: 18.1R2.6
Final sw version: 18.4R3
Now in case of problem I want to use only the so called "snapshot":
"On routers running Junos OS, back up the currently running and active file system partitions to standby partitions that are not running."
I already run the snapshot and now on the Internal NAND flash device (da1) there is a backup of root file system and of /config.
user@mx-80> request system snapshot
Verifying compatibility of destination media partitions...
Running newfs (899MB) on internal media / partition (da1s1a)...
Running newfs (100MB) on internal media /config partition (da1s1e)...
Copying '/dev/da0s1a' to '/dev/da1s1a' .. (this may take a few minutes)
Copying '/dev/da0s1e' to '/dev/da1s1e' .. (this may take a few minutes)
The following filesystems were archived: / /config
What was copied?
user@mx-80> show system snapshot
Information for snapshot on internal (da1s1)
Creation date: Apr 22 10:35:33 2020
JUNOS version on snapshot:
jbase : ppc-17.2R3.4
jcrypto: ppc-17.2R3.4
jcrypto-dp-support: 17.2R3.4
jdocs : 17.2R3.4
jkernel: ppc-17.2R3.4
jmacsec: 17.2R3.4
jpfe : MX80-17.2R3.4
jroute : ppc-17.2R3.4
jsd : powerpc-17.2R3.4
jsdn-powerpc: 17.2R3.4
jweb : ppc-17.2R3.4
py-base-powerpc: 17.2R3.4
py-extensions-powerpc: 17.2R3.4
Assuming that during the upgrade the router will not boot-up from da0 (does not matter in which step i am on the above upgrade path) and assuming that i do not want to use any usb, than the last chance for the router to boot-up is to use the da1.
Question: did i get correctly that in this case the router, using the snapshot on da1, will restore the OS 17.2R3.4 plus the configuration that was saved?
Thanks.