Netgear GS728TS(B) – ProSAFE 24-Port Gigabit Stackable Smart Switch with 4 SFP uplinks ソフトウェアガイド

Firmware Synchronization and Upgrade

All stack members must run the same software version to ensure compatibility within the 
stack. By default, if a unit is added to the stack and its software version is not the same as the 
stack master, that unit is not allowed to join the stack. You can enable the Stack Firmware 
Auto Upgrade feature, which will automatically synchronize the firmware version on the new 
unit with the version running on the stack master. The synchronization operation may result in 
either upgrade or downgrade of firmware on the mismatched stack member.

Upgrading the firmware on a stack of switches is the same as upgrading the firmware on a 
single switch. After you download a new image by using the File Download page or SCC, the 
downloaded image is distributed to all the connected units of the stack.

It is recommended to 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 should have 
image1 as the active image. For information about configuring the 
active image, see 

289.

Configuration Maintenance

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 will be elected master, and will then run 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.

Stack Master Election 

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