Dell PowerConnect PC7048R-RA Istruzioni per l'impilamento - Pagina 21
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Stacking Dell PowerConnect 7000 Series Switches
Synchronizing the Running Configuration between the
Master and Standby Units
The Master unit copies its running configuration to the Standby unit whenever the configuration
changes (subject to some minimal time delays introduced in the copy mechanism to increase the
efficiency of the transfer process). This enables the Standby unit to take over the stack operation with
minimal interruption if the Master unit becomes unavailable.
The running-config synchronization also occurs:
When the administrator saves the running configuration to the startup configuration on
the Master unit.
When the Standby unit changes.
Master Failover
If the current Master unit fails, the Standby unit becomes the Master unit. If no switch is preconfigured
as the Standby unit, the firmware automatically selects a Standby unit from the existing stack units.
When the failed Master resumes normal operation, it joins the stack as a member (not a Master) if the
new Master unit has already been elected.
The stack supports nonstop forwarding and graceful restart during a master failover. See "Nonstop
Forwarding" on page 23.
Effect of Master Failover on PoE Devices
Stack members that provide power-over-Ethernet (PoE) to connected devices continue to provide
power in the event of a master failover. The PoE application uses a separate controller on each unit,
and these controllers are not initialized upon a warm restart.
If PoE is enabled on a switch port shortly before a master failover and the hardware status change had
not yet been communicated to the backup unit, the switch will continue to provide PoE power even
though PoE is not enabled for the port in the configuration on the new master. The user can correct
this configuration mismatch by re-enabling PoE on the port.
Stack Member Failover
When a unit in the stack fails, the Master unit removes the failed unit from the stack. No changes or
configuration settings are applied to the other stack members; however, dynamic protocols will try to
re-converge as the topology could change because of the failed unit. When there are no connected
ports on the failed unit, the stack will be intact without any changes.
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