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Known Limitations

Learn about known limitations in this release 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.

Infrastructure

  • When upgrading from releases before Junos OS Release 21.2 to Release 21.2 and onward, validation and upgrade might fail. The upgrading requires using of the no-validate configuration statement. PR1568757

Platform and Infrastructure

  • Unified ISSU on QFX5120-48Y and EX4650 switches will not be supported if there is a change in the Cancun versions of the chipset SDKs between the releases. This is a product limitation as change in the Cancun firmware leads to the chip reset and hence ISSU is impacted. The Cancun versions in the chipset SDKs should be the same between two JUNOS OS releases for ISSU to work. PR1634695

  • When EVPN-VxLAN tunnel is established over V6 underlay, the encapsulated pkts emitted out of leaf node (QFX10K) may have UDP checksum zero. This is the default behavior of all V6 tunneled UDP pkts and it is allowed as per RFC6936. PR1656363

  • On QFX10008 devices, statistics for multicast packets is not as expected as the packets has Layer 2 header stripped during replication in PFE because of which it is not forwarded to the next hop. PR1678723