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Known Issues


This section lists the known issues in hardware and software in Junos OS Release 17.4R2 for the EX Series.

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


  • The set system ports console log-out-on-disconnect configuration statement does not work. PR1146891

  • When ML license is installed and if the master Routing Engine is operating at scale beyond the default limit, a ksyncd core file and a vmcore can be seen if gres configuration is enabled [while the master is scaling beyond the default limit]. PR1376362

Platform and Infrastructure

  • On an EX9200-12QS line card, interfaces with the default speed of 10-Gigabit Ethernet are not brought down even when the remote end of a connection is misconfigured as 40-Gigabit Ethernet. PR1175918

  • Various common situations lead to different views of forwarding information between kernel and Packet Forwarding Engines. For example, fpc7 KERNEL/PFE APP=NH OUT OF SYNC: error code 3 REASON: NH add received for an ifl that does not exist ERROR-SPECIFIC INFO: nh_id=562 , type = Hold, ifl index 334 does not exist TYPE-SPECIFIC INFO: none. There is no service impact observed in MPC2 and MPC3 type cards. PR1205593

  • On EX4300 switches, when a policer with the action of loss of priority is applied to the lo0 interface, all ICMP packets might be dropped. PR1243666

  • On EX4300 10G links, preexisting MACsec sessions might not come up after the following events: process (pfex, dot1x) restart or system restart link flaps. PR1294526

  • In Streaming Telemetry scenario, if commit full is performed, na-grpd daemon might restart causing disconnection of streaming telemetry. PR1326366

  • MPC5 - inline-ka PPP echo requests are not transmitted when anchor-point is lt-x/2/x or lt-x/3/x in a pseudowire deployment. PR1345727