Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Known Issues


This section lists the known issues in hardware and software for the QFX Series switches in Junos OS Release 17.2R2.

High Availability (HA) and Resiliency

  • During a nonstop software upgrade (NSSU) on an QFX5100 Virtual Chassis, a traffic loop or loss might occur if the Junos OS software version that you are upgrading and the Junos OS software version that you are upgrading to use different internal message formats. PR1123764

Interfaces and Chassis

  • On a QFX5110-48S switch, a Gigabit Ethernet interface goes down and comes back up once on a peer as part of a reboot. PR1237572

  • On QFX5100 switches, with MAC and ARP inside an IFA block, an error message that says an IRB interface and an AE logical interface do not belong to the same routing instance might be displayed, even though they do belong to the same routing instance. PR1239191

  • If the link between a QFX5200 switch interface and a NIC on a third-party device remains up irrespective of whether forward error correction (FEC) is enabled or disabled on the switch, then match the FEC mode (by setting FEC on or off) on the QFX5200 with that on the third-party device. PR1246654

  • On the QFX10000-12C-DWDM Coherent Line Card, it is possible that sometimes the link flaps when MACsec is enabled on Ethernet interfaces. PR1253703

  • On the QFX10000-12C-DWDM Coherent Line Card, when an interface is configured In 8QAM mode, pull out of fiber on the second "OT" interface in the same AC400 module brings both the "OT" interfaces down. This does not affect any functionality. PR1258539

  • Currently maximum 64 LAG members under a single aggregated Ethernet (ae-) bundle is supported for QFX Series platform. PR1259515

  • On QFX10000 series switches, at initialization, the port group module comes up after some time and negative ACKs are seen until the port group module is up. Once the port group module is up, negative ACKs are no longer observed. This is an expected behavior due to an Aggressive Link Scan feature introduced in Junos OS Release 17.2. PR1271579

  • On the QFX10008, if and when we release an upgrade to the existing line card FPGAs, then that upgrade, released in future, will need to be executed out of RE0 - it will not work out of RE1. When we release the upgrade, it will have to be release noted as such. At this time no action is required. PR1276300

  • Higher MTU configuration on an IRB than on the member link of its VLAN might bring down a VRRP session configured on the IRB. As a workaround, always have the MTU configured on the IRB of the VLAN be less than or equal to the MTU configured on its member links of the same VLAN because QFX Series devices do not throw error/warning messages during configuration commit. PR1295763

Layer 2 Features

  • On QFX5100 VC interfaces on which the flexible-vlan-tagging statement is specified, STP, RSTP, MSTP, and VSTP are not supported. PR1075230

Network Management and Monitoring

  • On QFX10002 switches, the request system snapshot command does not work. PR1048182

  • While using SSH to log into a VNF, an error with the message Unrecognized is seen. This has no impact on the functionality. PR1108785

Platform and Infrastructure

  • On QFX5100, QFX5110, and QFX5200 switches, the amount of time that it takes for Zero Touch Provisioning to complete might be lengthy because TFTP might take a long time to fetch required data. PR980530

  • In a data center interconnect (DCI) scenario, when two QFX5100-24Qs in different data centers are interconnected using a 40G link and DWDM is used in the connection especially with ADVA and single mode fiber (SMF) on one side and multimode fiber-optic (MMF) on the other, the 40G connection between the two QFX5100-24Qs may not be stable. Sometimes the link will come up and sometimes not. Frame errors might be seen constantly. PR1178799

  • On all Junos OS-based platforms, the Junos CLI file copy command uses "/var/home/<user>” as temporary staging directory for a non-root user, and uses /var/tmp for the root user. When a user issues the CLI command file copy user@x.x.x.x:/dir/ /var/tmp/ to copy a file to the device, and if the file the user is trying to transfer is larger than the temporary staging directory size, the copy will fail. PR1195599

  • For QFX5110-32Q, throughput as per RFC 2544 is not 100% for some of the frame sizes when the switch is configured with mixed 10/40/100G speed ports. It is fine when tested individually with 10G, 40G, and 100G ports separately. PR1256671

Routing Protocols

  • During a graceful Routing Engine switchover (GRES) on QFX10000 switches, some IPv6 groups might experience momentary traffic loss. This issue occurs when IPv6 traffic is running with multiple paths to the source, and the join-load-balance statement for PIM is also configured. PR1208583

  • When polling the SNMP MIB jnxFirewallsEntry and if more than one firewall filter was configured and attached to any logical interfaces on QFX series switches, the counters for only one firewall filter would be returned. Now all filters and counters are returned when polling the MIB. PR1250776

  • On QFX5100 switches, unified ISSU is not supported with MPLS configuration. PR1264786

  • On QFX10000 series platforms with EVPN and VxLAN configured, dcpfe might crash after a period of idle time. Service can be restored after the linecard is rebooted. PR1294055

Virtual Chassis

  • Configuration parameters that you apply to member1 of a virtual chassis through an apply group may not apply after a reboot if member1 is the virtual chassis master routing engine before the reboot. PR1305520