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Known Limitations

Learn about known limitations in this release for MX 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

  • MX-SyncE lock status shows LOCKED under the chassis synchronization extensive command when synchronization Ethernet source fails with the DUT configured with G.8275.1 profile. PR1509356

  • Changing the scaled firewall profiles on the fly does not release the TCAM resources as expected. PR1512242

  • LFM might flap during the MX-VC ISSU. PR1516744

  • PTP to PTP noise transfer test fails. PR1543982

  • MX upgrade failure with limited free disk space occurs. PR1582554

  • Interface hold-down timers cannot be achieved for less than 15 seconds on MPC11E at FRS. PR1444516


  • Software Image Upgrade from versions 21.1 (or earlier) to version 21.2 (or later) requires the no-validate statement. PR1586481


  • The rpd process might crash after you change the network service configuration. PR1461468

Platform and Infrastructure

  • Traffic might drop due to the QX-chipset MPC memory error. PR1197475

  • The following error message occurs:

  • Deactivating services rpm/rpm-tracking does not remove the tracked route from the routing or forwarding tables. PR1597190

Routing Protocols

  • If you do not execute the restart routing command after you configure enhanced ip might result in a label inconsistency leading to the rpd process to generate core file. PR1577451


  • During ISSU from Junos OS Release 18.4R1 to Junos OS Release 19.1, traffic through IPSEC VPN fails. PR1416334