Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Open Issues

Learn about open issues Junos OS Release 21.2R2 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 PTX Series platform with FPC type 3, the error message could be observed when FPC card goes online or off-line.PR1322491

  • This is a timing issue during the sxe interface bring up (w.r.t i40e driver). This can be recovered by rebooting the complete board. PR1442249

  • FIPS mode is not supported. PR1530951

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

  • The socket to sflowd closed error comes up when the ukern socket to sflowd daemon (server) is closed. The error is rectified by itself as the client successfully reestablishes the connection in the subsequent attempts. When these errors are consistent, it indicates a communication issue between sflowd and the sFlow running on the FPC. PR1538863

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

  • Copying files to /tmp/ causes a huge JTASK_SCHED_SLIP. Copy files to /var/tmp/ instead. PR1571214

  • On PTX10008, the end-to-end traffic is not flowing for ethernet-switching in EP Style.PR1583219

  • On PTX10008 and PTX10016 devices with LC1101, LC1102, and LC1103 line cards, interface flapping might cause the interface CRC errors increase continuously, then traffic loss might be seen. This is a rare timing issue. PR1600768

Layer 2 Ethernet Services

  • It was observed rarely that issuing a request system zeroize did not trigger ZTP. A simple workaround is to reinitiate ZTP.PR1529246


  • As the update-threshold configuration changes from an attribute to an object, you need to delete the update-threshold stanza and re-configure it after the downgrade PR1546447

  • The RSVP interface update threshold configuration syntax has changed between Junos OS Release 18.2X75-D435 and Junos OS Release 20.3X75-D10 to include curly braces around the threshold value. Upgrading and downgrading between these releases is not entirely automatic. The user must delete this stanza if configured before the downgrade and then manually reconfigure.PR1554744

  • On PTX3000 platform, if RPD is thrashing while doing GRES switchover there might be traffic loss on MPLS LSPs. PR1590681

Routing Protocols

  • Due to a race condition between route re-convergence and the BGP-PIC version up message to the Packet Forwarding Engine, after a remote transit router reboot, certain BGP routes might reuse stale LDP next hops and cause packet discard at the transit router during the route re-convergence window. PR1495435

  • If OSPF and RSVP are configured, when a device that is out of service is transmitting a large number of LSAs (more than 100,000), extremely busy neighbors are slow in sending LSACKs, and some LSA churn happens caused by route flaps. Then unexpected CSPF link down/deleted events happen on LSPs. This causes other OSPF routers in the OSPF domain to fail their CSPF calculation for the router loopbacks that act as P routers in this topology and thus drop the LSPs, causing traffic impairment. In addition, rpd utilization will be pegged to 100%. PR1576818

  • Traffic loss across the LDP path during traffic shift to another device in the MPLS cloud. Here two routers with two different capacities are converging at two different times, so the micro loop occurs between the two nodes. PR1577458

User Interface and Configuration

  • When a user tries to deactivate the MPLS related configuration, the commit fails on backup Routing Engine. PR1519367

  • On PTX platforms, the default routing policy might not be changed back after it is changed to network-services enhanced mode. PR1587174