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Open Issues

Learn about open issues in Junos OS Release 21.4R2 for QFX Series switches.

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


  • Need to modify I-ESI workflow on DC-GW.PR1600600

  • EVPN local ESI MAC limit might not be effective in some scenarios. PR1619299

General Routing

  • When VLAN is added as an action for changing the VLAN in both ingress and egress filters, the filter is not installed. PR1362609

  • PIM-based VXLAN does not work on QFX5110 switches. As a result, traffic loss is seen from VXLAN tunnel to Layer 2 interface. PR1462548

  • When running the command show pfe filter hw filter-name <filter name>, the command fails to retrieve the Packet Forwarding Engine programming details of the filter. PR1495712

  • On devices running Junos OS Release 21.4R2, 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

  • On the QFX5100 devices that does not run the QFX-5E codes (non TVP architecture), when you install the image with vendor SDK upgrade (6.5.X), the CPU utilization might go up by around 5 percent.PR1534234

  • On the QFX5000 devices, route leaking does not work for IPv4 routes if the mask is less than 16 and for IPV6 routes if the mask is less than 64.PR1538853

  • FPC might not be recognized after power cycle (hard reboot). PR1540107

  • On the QFX10002-60c devices, NP-100G-DAC-3M/5M does not start on QFX10002-60C devices.PR1555955

  • To avoid the additional interface flap, interface hold time needs to be configured. PR1562857

  • In mixed QFX5100, EX4300 VCF setup, duplicate traffic might be observed for some Layer 3 multicast traffic streams. PR1568152

  • The OSPF session over IRB might not come up in the EVPN-VXLAN scenario. PR1577183

  • On the QFX5100 device Virtual Chassis, the DHCP ACK messages do not get generated while verifying Smart Relay with interfaces in the routing instance. PR1581025

  • In a fully loaded devices, at times, firewall programming was failing due to scaled prefix configuration with more than 64800 entries. However, this issue is not observed in development setup. PR1581767

  • On Junos QFX10000 devices, 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

  • On the QFX5000 devices, the dcpfe process might crash. PR1588704

  • On QFX series, switches with the vendor chip as Packet Forwarding Engine, if IS-IS is enabled on an integrated routing and bridging (IRB) interface and the maximum transmission unit (MTU) size of the IRB interface is configured with a value great than 1496 bytes, the IS-IS hello (IIH) PDUs with jumbo frame size (i.e., great than 1496 bytes) might be dropped and not sent to the IS-IS neighbors. The following is the product list of QFX series switches with vendor chip as Packet Forwarding Engine. QFX3500/QFX3600/QFX5100/QFX5110/QFX5120/QFX5130/QFX5200/QFX5210/QFX5220 PR1595823

  • Pim VXLAN does not work on the TD3 chipsets that enables the VXLAN flexflow.PR1597276

  • The convergence time degradation is seen in IS-ISv6, OSPFv2, and OSPFv3 when comparing convergence time with Junos OS Release 21.1R1.5. As it is a convergence time issue, many components are involved and hence need investigation of rpd, kernel, and Packet Forwarding Engine. PR1602334

  • On QFX5100 devices, optical power is seen after detached and attached QSFP on disable interface. PR1606003

  • On the QFX10002-72q devices, the sFlow samples do not get generated for the transit MPLS traffic carrying IPv6..PR1607497

  • On the QFX10002-60C devices, the output-mac-control-frames and output-mac-pause-frames counters do not increase. PR1610745

  • On the QFX5100 Virtual Chassis, traffic loss occurs while testing the 118 aggregate Ethernet groups. PR1611162

  • On the QFX10002, QFX10008, and QFX10016 devices, on scaling more than 80,000 ARP/NDP, the prds_jpf_nh_token_change: Token change failed for rnh error messages gets generated. PR1616224

  • When the IFA2.0 init feature enabled on switch and flows are sampled, incorrect pps and bps statistics displayed at the logical child interface level on the ingress and egress ports. PR1620139

  • The led port init was done for SXE port. PR1621630

  • Secondary FPC lose their connection to the primary when new members are added to the Virtual Chassis Fabric (VCF). PR1634533

  • On all QFX Series devices, when any firewall filter is configured with action as sample and accept, and applied on the Integrated Routing and Bridging (IRB) interface. Then the firewall filter might drop all the inbound traffic.PR1646740

  • On Junos devices QFX5100, QFX5110, and QFX5200, when the device is rebooted or the dcpfe process gets restarted with the local-bias configuration statement enabled on the aggregate Ethernet interface, then the local-bias on the aggregate Ethernet interface does not work as expected. This impacts traffic utilization on the device as the Virtual Chassis (VC) ports might still carry traffic even when the local-bias is configured.PR1651151


  • On QFX Series platforms, IPv6 traffic output byte (ipv6-transit-statistics) might not be in expected range as per traffic generator statistics. PR1653671

Interfaces and Chassis

  • On the QFX5120 devices, multiple mclag-cfgchkd process generates core files after loading the recent operating system. PR1599025

Layer 2 Ethernet Services

  • The DHCP client configuration is coming from two places, that is, AIU script and VSDK sandbox. The DHCP client configuration coming from AIU script has the serial ID in vendor ID where as the default configuration from sandbox doesn't have it. There is no impact on functionality or service. PR1601504

Layer 2 Features

  • Adding one more sub-interface logical interface to an existing interface causes 20 to 50 milliseconds traffic drop on the existing logical interface. PR1367488

Platform and Infrastructure

  • When the DHCP relay mode is configured as no-snoop, we are observing the offer gets dropped due to incorrect ASIC programming. This issue only affects while running DHCP relay on EVPN/VXLAN environment. PR1530160

Routing Protocols

  • Multicast traffic is overusing the switch core when igmp-snooping is removed. The MCSNOOPD will generate core files due to the changes in mrouter interfaces and routes. PR1569436

  • When the statement accept-remote-source under PIM is removed, the PIM SG entries might not be updated with the correct RPF. Clearing of the states would take care of the issue. This is day-1 behavior. PR1593283

  • The mcsnoopd process might generate core files at rt_mcnh_nh_add_del, rt_mcnh_nh_add_with_table_id, mc_build_nh_for_bd_evpn_extended, mc_bd_create_or_update_all_fld_grp_routes. PR1605393

User Interface and Configuration

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