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Known Limitations

Learn about known limitations in this release for PTX Series routers.

For the most complete and latest information about known Junos OS defects, use the Juniper Networks online Junos Problem Report Search application.


  • To upgrade to Junos OS Release 21.2R1, you need to include the no-validate option when issuing the upgrade command.

    Junos OS releases prior to 20.4R1 do not support the no-validate option with unified ISSU. In order to upgrade from an older release to Junos OS Release 21.2R1 with unified ISSU, you must first upgrade to a release that supports the no-validate option for unified ISSU, such as 20.4R1. PR1568757