Dell PowerConnect 55xx Systems User Guide 53FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Maintenance Projects\DellContax\sources\CxUGStacking.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 1 0 / 3 0 / 1 3 - F O R P R O O F O N LYconfiguration is not saved, for example, dynamically-learned MAC addressesare not saved, but dynamic information is learned quickly and automaticallyby network traffic.Switching from the Master to the Master BackupThe Master Backup replaces the Stack Master if one or more of the followingevents occur:• The Stack Master fails or is removed from the stack.• Links from the Stack Master to the stacking members fails.• User performs soft switchover via the Web interface or the CLI.Switching between the Stack Master and the Master Backup results in limitedservice loss. Dynamic tables are relearned if a failure occurs. The RunningConfiguration file is synchronized between Stack Master and the MasterBackup, and continues running on the Master Backup.Replacing Stacking MembersIf a unit is removed from the stack, and replaced with a unit with the sameunit ID, the stack member is configured with the original unit configuration.Otherwise, if the new unit has either more or fewer ports than the previousunit, the results depend on the device type of the new and original units, asdefined in Table 4-1:Table 4-1. Port Configurations when Replacing UnitsNew Unit Original Unit New Port Configuration5548P or 5548 5548P or 5548 Port configurations remain the same.5524 or 5524P The first 24 Giga (GE) ports receive therespective 5524/P 24 GE portconfigurations. The 10 G portconfigurations remain the same.
