For live upgrading a VSX cluster, the correct procedure is to use the vsx update-software option, which allows in-service software upgrade (ISSU) with minimal disruption by upgrading switches one at a time while maintaining synchronization.
issu update-software is not a recognized command in Aruba CX.
Reloading the primary first risks service disruption.
Compatibility mode is not required prior to reboot.
[References:, , Aruba VSX Upgrade Procedures Guide, , HPE Aruba VSX Best Practices for Software Upgrades, , ArubaOS-CX VSX Documentation]
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