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Known Limitations

Learn about limitations in this release for ACX Series routers.

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

General Routing

  • Powering up and configuring data path of 400G-ZR and 400G-ZR-M optics is not instant and takes more time comparatively with other optics. So, the user has to wait enough time before switching to new speed configuration. If a user switches from one speed to another speed without waiting, it leads to interface down. PR1635443

  • PSU's do not have fault simulation feature. So LEDs cannot be controlled by the software. PR1731084
  • During first power cycle or reboot of router, primary Routing Engine (RE) takes 30 to 60 seconds more, to be displayed in CLI show chassis routing-engine. There is no functional impact due to this and it is limited to cosmetic display for a brief time only. PR1743012

  • In Junos OS Evolved Release 23.4 on ACX7348 or ACX7332, syslog messages related to PEX configuration is seen at bootup with sib-slot which should be corrected as cb-slot in later releases.


  • CRC errors can be seen with SFP-T (Copper) optics. PR1771671