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Junos OS Release Notes for PTX Series Packet Transport Routers

These release notes accompany Junos OS Release 15.1F2 for the PTX Series. 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

Caution: This release introduces some behavior changes to the unified in-service software upgrade (ISSU) functionality for PTX Series routers. We do not recommend using unified ISSU to upgrade from an earlier Junos OS release to Junos OS Release 15.1.

Modified: 2017-07-06