Managing M-series and MX-series Device Software Versions
You can use Network and Security Manager (NSM) to upgrade or adjust the software on managed M-series and MX-series devices running JUNOS Release 9.3 or later.
When a software upgrade is applied to an M-series or MX-series device with dual Routing Engines, the upgraded software is applied to both Routing Engines. The backup is upgraded first. The router then reboots and the backup becomes the master. Then the former master is upgraded, as is the standard procedure for upgrading M-series and MX-series devices with dual Routing Engines.
For more information and steps about updating the device software version, see “Upgrading the Device Software” in the Network and Security Manager Administration Guide.
