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Known Issues for QFX5110 and QFX5200 Switches


This section lists the known issues in hardware and software in Junos OS Release 15.1X53-D237 for QFX5110 and QFX5200 switches.

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

Class of Service (CoS)

  • On QFX5110 switches, the classifier binding fails if the family configuration and the classifier configuration (manual DSCP classifier) are committed in one single commit. To avoid this problem, apply the family configuration and the classifier configuration on an interface in two separate commits. As a workaround, deactivate and then activate the CoS classifier configuration—you do not need to deactivate the whole CoS configuration; just deactivate the classifier-specific configuration. PR1241374

  • When CPU Q cells (memory) is exhausted when the incoming packet rate is less than 10 pps, you will observe DDoS violations. PR1381775

General Routing


  • When a QFX5110 switch operates as a DHCP relay agent, DHCP reply packets might not be relayed back to the client by the relay agent if the reply packets enter the switch through a GRE tunneling interface. PR1198982

Interfaces and Chassis

  • On an MC-AE node on a QFX5200 switch, OSPF enabled on a VRRP-based IRB interface might stay in ExStart state if the routing instance has both VRRP-based IRB and mcae-mac-synchronize-based IRB . PR1139558

  • After a QFX5110-48S switch reboots, a 1-Gigabit Ethernet interface on a peer might stay up for approximately four to five seconds even after you issue the set interfaces ge-interface name disable command. This issue is not seen on xe interfaces or et interfaces. PR1237814

Layer 2 Features

  • On QFX5200 switches, if RTG and VSTP are configured on the same VLAN, MAC addresses might or might not be learned on RTG interfaces in that VLAN. If RTG is configured on some interfaces in a VLAN, do not configure VSTP on that same VLAN. PR1099995

  • A deadlock situation between the pfeman thread and the chip's linkscan thread causes a watchdog trigger. As a result, the dcpfe process generates a core file. PR1398251

  • In aggregated interfaces and spanning tree protocol (STP) scenario, the STP does not work when the aggregated interfaces number is ae1000 or above in QFX5110 and QFX5200 and ae480 or above in other QFX Series switches. Such interfaces remains in incorrect STP discarding state and might not forward packets. PR1403338


  • Statistics of transit traffic do not increment LSP statistics signaled by RSVP-TE. PR1362936

Multicast Protocols

  • On QFX5110 switches, when an interface that functions as a downstream source (S,G) multicast interface is configured with the targeted-broadcast statement, multicast routing and forwarding do not work on that or any other downstream interface. PR1237404

Network Management and Monitoring

  • From Junos OS Release 15.1 onward, if you restart Management Information Base (mib) process by using restart mib-process CLI command, the MIB2D_FILE_OPEN_FAILURE error message might appear in the logs. PR1202044

Routing Protocols

  • On QFX5110 switches, the dcpfe might create a core file when the applied lo0 firewall filter term is changed in scaled conditions. PR1241733

  • On QFX5200 switches, a filter with a routing instance applied to family inet logical interfaces causes traffic to be discarded on unrelated interfaces. PR1364020


Software Installation and Upgrade

  • On QFX5110 and QFX5200 switches, ZTP commits the downloaded configuration before installing the downloaded image (obtained thru DHCP). PR1241412

  • When base configs are executed the following syslog message is seen: kernel: GENCFG: op 51 (AE bias) failed; err 255 (Undefined). These messages do not have any functionality impact. PR1416004

  • No functionality impact is observed because of the following error message: Error: BRCM_NH-,brcm_nh_bdvlan_ucast_uninstall(),128:l3 nh 6594 unintsall failed in h/w with Mini-PDT base configurations. PR1407175