In version 17.4 a new feature of cluster wide upgrades was introduced. This feature is not available in previous versions.
Generally, the documentation is version specific and is aimed at upgrading from that version to future versions, so for full details, refer to the Getting Started Guide of the platform of the version you are upgrading from, at https://www-prev.pulsesecure.net/techpubs/Pulse-vADC-Solutions/Pulse-Virtual-Traffic-Manager.
Upgrading a Cluster From One Revision to Another
For version 17.2, for a cluster, the procedure for upgrading a cluster of several Traffic Managers is the same as upgrading one. Note that when the cluster is in a mixed state (cluster members are using different software versions), Brocade strongly advises against making any configuration changes.
To upgrade a cluster, upgrade each Traffic Manager in turn. All Traffic Managers in the cluster continue to run their configured services.
|Note: For further info on upgrade paths please refer https://kb.pulsesecure.net/articles/Pulse_Secure_Article/KB44475|