Managing Redundancy On A Stack; Resetting A Unit On A Stack - Dell S4048T Configuration Manual

When the management unit fails, the unit disappears from the stack topology. At that time, the standby unit
detects the communication loss and switches from the standby unit role to the management unit role in the
stack. From the remaining units in the stack, the system selects a new standby unit based on the unit priority
using the same algorithm used when the stack was initially created. When the failed unit recovers, it takes the
next available role, usually that of a stack member.
• Influence the selection of the stack management units.
CONFIGURATION mode
stack-unit unit-number priority priority-value
The unit with the numerically highest priority is elected the master management unit, and the unit with the
second highest priority is the standby unit.
The range is from 1 to 14.
The default is 0.

Managing Redundancy on a Stack

Use the following commands to manage the redundancy on a stack.
• Reset the current management unit and make the standby unit the new master unit.
EXEC Privilege mode
redundancy force-failover stack-unit
A new standby is elected. When the former stack master comes back online, it becomes a member unit.
• Prevent the stack master from rebooting after a failover.
CONFIGURATION mode
redundancy disable-auto-reboot stack-unit
This command does not affect a forced failover, manual reset, or a stack-link disconnect.
• Display redundancy information.
EXEC Privilege mode
show redundancy

Resetting a Unit on a Stack

You may reset any stack unit except for the master management unit, as shown in the following message.
% Error: Reset of master unit is not allowed.
To rest a unit on a stack, use the following commands.
• Reload a stack-unit.
EXEC Privilege mode
reset stack-unit unit-number
Stacking 1034