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Open Issues

Learn about open issues in Junos OS Rlease 21.4R2 for PTX Series routers.

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

General Routing

  • On the PTX Platform with FPC-PTX-P1-A or FPC2-PTX-P1A, you might encounter a single event upset (SEU) event that might cause a linked-list corruption of the TQCHIP. The following syslog message gets reported: Jan 9 08:16:47.295 router fpc0 TQCHIP1: Fatal error pqt_min_free_cnt is zero Jan 9 08:16:47.295 router fpc0 CMSNG: Fatal ASIC error, chip TQ Jan 9 08:16:47.295 router fpc0 TQ Chip::FATAL ERROR!! from PQT free count is zero Jan 9 08:16:47.380 router alarmd[2427]: Alarm set: FPC color=RED, class=CHASSIS, reason=FPC 0 Fatal Errors - TQ Chip Error code: 0x50002 Jan 9 08:16:47.380 router craftd[2051]: Fatal alarm set, FPC 0 Fatal Errors - TQ Chip Error code: 0x50002 The Junos OS Chassis Management error handling detects such a condition, raises an alarm, and disables the affected Packet Forwarding Engine entity. To recover this Packet Forwarding Engine entity, restart the FPC. Contact your Juniper support representative if the issue persists even after the FPC restarts. PR1254415

  • In the platform using INH (indirect next hop, such as Unilist) as route next hop type for multiple paths scenario (such as BGP PIC or ECMP), the session fast-reroute might be enabled in Packet Forwarding Engines (PFEs). When the version-id of session-id of INH is above 256, the PFE might not respond to session update, which might cause the session-id permanently to be stuck with the weight of 65535 in PFE. It might lead PFE to have a different view of Unilist against load-balance selectors. Then either the BGP PIC or the ECMP-FRR might not work properly and traffic might be dropped or silently discarded. PR1501817

  • On PTX Series devices running Junos OS, the JFlow service might not report the accurate throughput rate. This issue is seen when there is high sampled traffic rate with low flow cache hit ratio.PR1502645

  • Flapping might be observed on channelized ports of PTX Series routers during ZTP when one of the ports is disabled on the supporting device. PR1534614

  • Unsupported configuration is being attempted by the script that then hits the maximum threshold for the given platform. PR1555159

  • On PTX platforms, when Inline Jflow is configured and high sampling rate (more than 4000 per second) is set, high CPU utilization might be observed and this might result in relevant impacts on traffic analysis and billing. PR1569229

  • On PTX10000 platforms running Junos OS device, file permissions might be changed for /var/db/scripts files after rebooting the device. This issue might have an impact on the scripts running on the box. PR1583839

  • In QFX10002-60C device under MAC statistics output-mac-control-frames & output-mac-pause-frames does not increment. PR1610745

  • When a number of routes resolve over an ECMP path, the inline BFD sessions might flap during clear isis adjacency command or RPD restart trigger. PR1612802

  • V6 default route will not get added after successful dhcpv6 client binding on PTX1000 devices during ZTP. PR1649576

  • Fetching SR JVision sensors for for aggregate Ethernet IL per member link stats will not reset after doing the restart routing.PR1652372

  • Range field of gre_key flt_type was incorrectly mapped to legacy TOS for DSCP.PR1652762


  • On PTX3000 devices, if RPD thrashes during a GRES switchover, there might be traffic loss on MPLS LSPs. PR1590681

User Interface and Configuration

  • File delete with regular expression might fail, if using filename without regular expression works. PR1624562