Netgear M4300-24X24F (XSM4348S) - Stackable Managed Switch with 48x10G including 24x10GBASE-T and 24xSFP+ Layer 3 Manual Do Utilizador

We recommend that you set the active image for all stack members 
the same as the active image of the stack master. In other words, if 
image1 is the active image on the stack master, all units must use 
image1 as the active image. For information about configuring the 
active image, see 

The stack master stores and maintains the saved and running configuration files for the 
switch stack. The configuration files include the system-level settings for the switch stack and 
the interface-level settings for all stack members. Each stack member retains a copy of the 
saved file for backup purposes. If the master is removed from the stack or becomes 
unavailable, another member is elected master and then runs from that saved configuration.

The switch master copies its running configuration to the stack member configured as the 
standby

 unit whenever it changes (subject to some restrictions to reduce overhead). This 

enables the standby unit to take over the stack operation with minimal interruption if the stack 
master becomes unavailable. The running-config synchronization also occurs when the 
running configuration is auto-saved on the stack master or when the standby unit changes.

All stack members are eligible stack masters. If the stack master becomes unavailable, the 

remaining stack members participate in electing a new stack master from among themselves. 
The following factors determine which switch is elected the stack master:

The switch that is master always has priority to retain the role of master.

Assigned priority.

MAC address.

When the stack is powered up and completes the boot process or the original stack master 
becomes unavailable, the stack master is determined through an election process. 

The rules for stack master election are as follows:

If a unit was elected stack master previously, then it remains the stack master and other 
units are stack members. 

If no units were stack masters, or more than one unit was a stack master, then the unit 
with the highest management preference is elected stack master. The management 
preference can be assigned by the administrator. However, if all units are assigned the 
same management preference, then the unit with the highest MAC address is assigned 
as the stack master.