PowerConnect B-Series FCX Configuration Guide 163
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PowerConnect B-Series FCX hitless stacking
5
Supported events
The following events are supported by hitless stacking:
• Failover
• Switchover
• Priority change
• Role change
Non-supported events
The following events are not supported by hitless stacking. These events require a software reload,
resulting in an impact to data traffic.
• Unit ID change – When a stack is formed or when a unit is renumbered using secure-setup.
• Stack merge – When the old Active Controller comes back up, it reboots. If it has fewer number
of members than the Active Controller, it loses the election, regardless of its priority. If it has a
higher priority, it becomes the Standby Controller after the reboot and is synchronized with the
Active Controller. Next, a switchover occurs and it becomes the new Active Controller.
Supported protocols and services
Table 37 lists the services and protocols that are supported by hitless stacking. Table 37 also
highlights the impact of a hitless switchover or failover to the system’s major functions.
Services and protocols that are not listed in Table 37 will encounter disruptions, but will resume
normal operation once the new Active Controller is back up and running.
