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Known Limitations
Learn about known limitations in Junos OS Release 21.4R2 for EX Series switches.
For the most complete and latest information about known Junos OS defects, use the Juniper Networks online Junos Problem Report Search application.
General Routing
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When the device is up and running for a long time, there is a possibility FS gets bad blocks and it is accumulated. When any change done to it, it reloads and tries to recover the bad blocks from the FS. PR910445
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Unified ISSU on QFX5120-48Y and EX4650 devices will not be supported if there is a change in the Cancun versions of the chipset SDKs between the releases. This is a product limitation as change in the Cancun firmware leads to the chip reset and hence unified ISSU is impacted. The Cancun versions in the chipset SDKs should be the same between two operating system releases for unified ISSU to work. PR1634695
Infrastructure
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While upgrading the image from 21.2 to 21.3, the
no-validate
configuration statement is mandatory for the upgrade command to proceed. PR1586481