Upgrade JunOS on SRX Chassis Clusters.

SRX devices in a Chassis Cluster have a requirement to not have different version of JunIS on each node of the cluster.

Because of this, it is very important to ensure that both devices in the cluster come online at the same time.

The recommended procedure requires CLI access (via Console, Telnet, or SSH):

1. Install the software on each cluster member (node0 and node1),
using the CLI command (but don’t reboot):

request system software add [JUNOS Package Location] no-validate no-copy unlink

2. Simultaneously, at the same time, reboot both
cluster nodes by entering the following command (on each node):

request system reboot

Reference: Juniper KB


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