TP-Link T1700G-28TQ User Manual page 58

The master is elected based on the following rules and in the order listed:
1. The switch that is formerly the stack master.
2. The switch with the highest stack member priority value.
3. The switch with the longest running time.
4. The switch with the lowest MAC address.
After master election, the stack forms and enters into stack management and maintenance
stage.
Note:
1. The priority value ranges from 1 to 15. The higher the value is, the more likely the member
will be elected as the master. By default, the member priority of the switch is 5. We
recommend you manually assign the highest priority value to the switch that you prefer to
be the stack master before stack establishment.
2. The switch is non-preemptible when it joins the stack in cold-start mode, and the process
is illustrated as bellow: the switch has no stack role at its start, and it sends out discovery
messages to collect the topology of the current stack system. After the topology collection,
the switch obtains its role according to the rules above. The switch will become stack
member if there is already a master in the stack. The master will resume its role even if
the newly joined switch has a higher priority.
4) Stack Management and Maintenance
After the stack is established, all the stack members are integrated into a virtual device in the
network and managed by the master. The following section briefly introduces the concepts
and rules involved in stack management stage.
Unit Number: When the stack is running, unit number is used to identify and manage
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member devices. Unit number is unique in a stack system. The factory default unit number
of switch is 1. In order to keep its uniqueness, before establishing stack you are kindly
recommended to prepare a unit number assignment scheme and then manually configure
it on each member device.
During unit number assignment process, the master prioritizes the member devices
already carrying manually assigned unit number. If the unit number has not been used by
other stack members the member device will keep it. Otherwise, the unit number is
configured based on the following rules and in the order listed:
1. The device which was managed by the current master before the configuration will
resume its unit number.
2. The device with manually assigned unit number is prior to the device whose unit
number assignment mode is "Auto".
3. The device which matches the provisioned device type will get the corresponding unit
number
4. The device with the highest stack member priority value.
5. The device with the lowest MAC address.
Note:
1. You can get the current unit number of the switch from the unit number LED on the
front panel of the switch.
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