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Upgrading Junos OS in a Virtual Chassis Configuration for MX Series 3D Universal Edge Routers
You can upgrade an MX Series Virtual Chassis configuration from Junos OS Release 11.2 to a later release. This upgrade procedure assumes that both member routers in the Virtual Chassis have dual Routing Engines installed.
 | Note: Make sure all four Routing Engines in the Virtual Chassis (both Routing Engines in the master router and both Routing Engines in the backup router) are running the same Junos OS release. |
To upgrade Junos OS in a Virtual Chassis configuration consisting of two MX Series routers, each with dual Routing Engines:
- Prepare for the upgrade.
- Install the Junos OS software package on each of the four Routing Engines.
- Reboot the Routing Engines to run the new Junos OS release.
- Re-enable graceful Routing Engine switchover and nonstop active routing.
