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What’s Changed in Release 21.2R2

Learn about what changed in this release for PTX Series routers.


  • Minimum auto-recovery time reduced for duplicate MAC address detection (ACX Series, PTX Series and QFX Series)—Junos OS has changed the minimum value allowed for auto-recovery time for duplicate MAC address detection from 5 minutes to 1 minute. The auto-recovery time is the length of time that the device suppresses a duplicate MAC address. Reducing the auto-recovery time allows customers to quickly recover from a MAC address duplication state. You configure the auto-recovery-time option under the duplicate-mac-detection statement at the edit routing-instances routing-instance-name protocols evpn or edit protocols evpn hierarchy.

    [See Changing Duplicate MAC Address Detection Settings .]

General Routing

  • Enhancement to the request system license add terminal command (PTX10001-36MR )— When you run the request system license add terminal command. You can now view following additional fields for information: JUNOS564022985: Ignoring unknown feature .

    [See Managing vMX Licenses.]


Layer 2 Features

Software Licensing

  • Juniper Agile Licensing (PTX10003, PTX10016, QFX5130-32CD, and QFX5220)—Starting from this release onwards, the Juniper Agile License Manager is deprecated. You can use the Juniper Agile Licensing Portal to activate, install, manage, and monitor licenses on Juniper Networks devices.

    [See Juniper Agile Licensing Guide.]