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Junos OS Release Notes for vMX

 

These release notes accompany Junos OS Release 19.4R3 for vMX. They describe new and changed features, limitations, and known and resolved problems in the hardware and software.

You can also find these release notes on the Juniper Networks Junos OS Documentation webpage, located at https://www.juniper.net/documentation/product/en_US/junos-os.

What’s New

There are no new features for vMX in Junos OS Release 19.4R3.

What's Changed

There are no changes in behavior or syntax for vMX in Junos OS Release 19.4R3.

Known Limitations

There are no known behaviors and limitations for vMX in Junos OS Release 19.4R3.

Open Issues

Learn about open issues in this release for vMX.

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

Platform and Infrastructure

  • On a vMX instance, the performance of an X710 NIC is lower compared to the performance of an 82599 NIC. A 10-Gbps line rate can be achieved at a 512 byte packet size for the X710 NIC compared to 256 bytes for the 82599 NIC. PR1281366

  • The virtio throughput remains the same for multi-queue and single-queue deployments. PR1389338

Resolved Issues

Learn which issues were resolved in the Junos OS main and maintenance releases for vMX.

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

CLI

  • The commands request system halt and request system power-off do not work as expected on MX150 device. PR1468921

Platform and Infrastructure

  • On vMX instances, configuring the statement ranges for auto-sensed VLANs (either stacked VLANs or single-Tag VLANs) might not work. This is because the VLANs are not programmed on the NIC drivers. PR1503538

  • On vMX, core.vmxt.mpc0' seen at 5 0x096327d5 in l2alm_sync_entry_in_pfes (context=0xd92e7b28, sync_info=0xd92e7a78) at ../../../../../src/pfe/common/applications/l2alm/l2alm_common_hw_api.c:1727. PR1430440

Licensing

Starting in Junos OS Release 19.2R1, Juniper Agile Licensing introduces a new capability that significantly improves the ease of license management network wide. The Juniper Agile License Manager is a software application that runs on your network and provides an on-premise repository of licenses that are dynamically consumed by Juniper Networks devices and applications as required. Integration with Juniper's Entitlement Management System and Portal provides an intuitive extension of the existing user experience that enables you to manage all your licenses.

  • The Agile License Manager is a new option that provides more efficient management of licenses, but you can continue to use individual license keys for each device if required.

  • To use vMX or vBNG feature licenses in Junos OS Release 19.2R1 version, you need new license keys. Previous license keys will continue to be supported for previous Junos OS releases, but for the Junos OS 19.2R1 release and later you need to carry out a one-time migration of existing licenses. Contact Customer Care to exchange previous licenses. Note that you can choose to use individual license keys for each device, or to deploy Agile License Manager for more efficient management of licenses.

  • For more information about Agile Licensing keys and capabilities, see Juniper Agile Licensing portal FAQ.

See Juniper Agile Licensing Guide for more details on how to obtain, install, and use the License Manager.

Upgrade Instructions

You cannot upgrade Junos OS for the vMX router from earlier releases using the request system software add command.

You must deploy a new vMX instance using the downloaded software package.

Remember to prepare for upgrades with new license keys and/or deploying Agile License Manager.