Which member types requirea reboot when doing an In-Service-Software-Upgrade within a VSF stack?

In a Virtual Switching Framework (VSF) stack, the standby member requires a reboot when performing an In-Service Software Upgrade (ISSU). This process allows for the software of the networking devices in the VSF stack to be updated with minimal disruption to the network. The standby member in a VSF configuration is rebooted to apply the new software version while the active member continues to handle the network traffic, ensuring continued operation of the network. This approach minimizes downtime during the upgrade process, which is critical for maintaining network availability and performance.