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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.

Chassis Clustering

  • In Z-mode configuration, sometimes the statistics of back-up session may not be correct on fail-over from master to back-up.PR1667098

  • In SRX4100 and SRX4200 devices, there is a hardware limitation of Intel 82599 NIC where maximum of 128 unit case mac addresses plus mac filters are supported. For MNHA switching mode, if you define more than 127 virtual MACs on same revenue or AE interface, the extra (those beyond 127) virtual MAC filters could not be programmed to the NIC so you would see traffics (towards those vMACs) got silently dropped.PR1687262


  • On SRX4600 platform, the CPU may overrun while performing sanity check due to incompatibility issues between ukern scheduler and Linux driver which might lead to traffic loss.PR1641517

  • When upgrading from releases before Junos OS Release 21.2 to Release 21.2 and onward, validation and upgrade might fail. The upgrading requires using of 'no-validate' configuration statement.PR1568757

User Interface and Configuration

  • On all Junos and Evolved platforms configured with persist-group-inheritance, which is enabled by default from 19.4R3 onwards, might lead to mustd process crash in highly scaled configuration.PR1638847


  • In some scenario(e.g configuring firewall filter) sometimes srx5K might show obsolete IPsec SA and NHTB entry even when the peer tear down the tunnel. PR1432925