User guide

Dell PowerConnect 55xx Systems User Guide 51
configuration is not saved, for example, dynamically-learned MAC addresses
are not saved, but dynamic information is learned quickly and automatically
by network traffic.
Switching from the Master to the Master Backup
The Master Backup replaces the Stack Master if one or more of the following
events 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 limited
service loss. Dynamic tables are relearned if a failure occurs. The Running
Configuration file is synchronized between Stack Master and the Master
Backup, and continues running on the Master Backup.
Replacing Stacking Members
If a unit is removed from the stack, and replaced with a unit with the same
unit ID, the stack member is configured with the original unit configuration.
Otherwise, if the new unit has either more or fewer ports than the previous
unit, the results depend on the device type of the new and original units, as
defined in Table 6-1:
Table 4-1. Port Configurations when Replacing Units
New Unit Original Unit New Port Configuration
5548P or 5548 5548P or 5548 Port configurations remain the same.
5524 or 5524P The first 24 Giga (GE) ports receive the
respective 5524/P 24 GE port
configurations. The 10 G port
configurations remain the same.