Migration, Upgrade, and Downgrade Instructions
This section contains the upgrade and downgrade support policy for Junos OS for ACX Series routers. Upgrading or downgrading Junos OS might take several minutes, depending on the size and configuration of the network.
Starting in Junos OS release 21.2R1, all Junos OS products which were previously running on FreeBSD 11.x based Junos OS are migrated to FreeBSD 12.x based Junos OS.
For information about software installation and upgrade, see the Installation and Upgrade Guide.
Starting in Junos OS Release 21.4R1 and later releases, ssh root-login is
required for copying the line card image (chspmb.elf) from Junos OS VM to Linux host during
installation for ACX5448 VM host based platforms. Do not disable it through configuration
during installation. Use deny-password instead of deny as
default root-login option under ssh configuration to allow internal trusted
communication.
For information on VMHost based platforms, see VM Host Overview (Junos OS).
Upgrade and Downgrade Support Policy for Junos OS Releases and Extended End-Of-Life Releases
We have two types of releases, standard EOL and EEOL:
-
Standard End of Life (EOL) releases have engineering support for twenty four months after the first general availability date and customer support for an additional six more months.
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Extended End of Life (EEOL) releases have engineering support for thirty six months after the first general availability date and customer support for an additional six more months.
For both standard EOL and EEOL releases, you can upgrade to the next three subsequent releases or downgrade to the previous three releases. For example, you can upgrade from 20.4 to the next three releases – 21.1, 21.2 and 21.3 or downgrade to the previous three releases – 20.3, 20.2 and 20.1.
For EEOL releases only, you have an additional option - you can upgrade directly from one EEOL release to the next two subsequent EEOL releases, even if the target release is beyond the next three releases. Likewise, you can downgrade directly from one EEOL release to the previous two EEOL releases, even if the target release is beyond the previous three releases. For example, 20.4 is an EEOL release. Hence, you can upgrade from 20.4 to the next two EEOL releases – 21.2 and 21.4 or downgrade to the previous two EEOL releases – 20.2 and 19.4.
| Release Type | End of Engineering (EOE) | End of Support (EOS) | Upgrade/Downgrade to subsequent 3 releases | Upgrade/Downgrade to subsequent 2 EEOL releases |
|---|---|---|---|---|
| Standard End of Life (EOL) | 24 months | End of Engineering + 6 months | Yes | No |
| Extended End of Life (EEOL) | 36 months | End of Engineering + 6 months | Yes | Yes |
For more information about standard EOL and EEOL releases, see https://www.juniper.net/support/eol/junos.html.
For information about software installation and upgrade, see the Installation and Upgrade Guide.