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Known Limitations

Learn about known limitations in this release for SRX Series devices.

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

General Routing

  • Due to enhancements in AppID starting Junos OS Release 21.1R1, database files are not compatible with earlier releases. Hence, this issue is expected to be seen during downgrade from Junos OS Release 21.1R1 to earlier releases. PR1554490


  • The Junos OS Release 21.2R1 is stable12 BSD release. There is a limitation where image validation is not supported across different BSD versions. Image validation will fail from stable11 to stable12 for upgrade between different BSD releases. Use no-validate option when upgrading the Junos OS releases. PR1568757


  • In SPC2 and SPC3 mixed-mode HA deployments, tunnel per second (TPS) is getting affected while dead peer detection (DPD) is being served on existing tunnels. This limitation is due to a large chunk of CPU being occupied by infrastructure (gencfg) used by IKED to synchronize its DPD state to the backup nodes. PR1473482