What’s Changed in Release 21.1R1

Python 2.7 deprecation (ACX Series, EX Series, MX Series, PTX Series, QFX Series, SRX Series, vMX, and vSRX)—Starting in Junos OS Release 21.1R1, devices running Junos OS no longer support Python 2.7. We've deprecated the corresponding language python statement at the [edit system scripts] hierarchy level. To execute Python scripts, configure the language python3 statement at the [edit system scripts] hierarchy level to execute the scripts using Python 3.

[See Understanding Python Automation Scripts for Devices Running Junos OS.]

Support for disconnecting unresponsive NETCONF-over-SSH clients (ACX Series, EX Series, MX Series, NFX Series, PTX Series, QFX Series, SRX Series, vMX, and vSRX)—You can enable devices to automatically disconnect unresponsive NETCONF-over-SSH clients by configuring the client-alive-interval and client-alive-count-max statements at the [edit system services netconf ssh] hierarchy level. The client-alive-interval statement specifies the timeout interval in seconds, after which, if no data has been received from the client, the device requests a response. The client-alive-count-max statement specifies the threshold of missed client-alive responses that triggers the device to disconnect the client, thereby terminating the NETCONF session.

[See ssh (NETCONF).]

vCPU Core-Based License Requirement—Starting in Junos OS Release 21.1R1, vSRX 3.0 requires a vCPU core-based license when you perform a software upgrade. When the software is upgraded, a warning message is displayed in Syslog indicating the requirement of the new vCPU core-based license.

[See KB37351.]