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
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 with the highest stack member priority value.
4.
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.
2.
When the stack is running, if you want to change the unit number manually, only the
unit numbers which have not been occupied by the other member devices are
available for you to choose from.
•
Port Number Format:
The format of port number should be Unit Number/Slot Number/Port Number. Among
them:
(1)
Unit Number: The default unit number of the switch is 1. If a device has joined
stack system, the unit number which the device possesses in the stack system
will be kept using as its unit number after the device leaves the stack system.
(2)
Slot Number: Indicates the number of the slot the interface card is in. For
T3700G-52TQ, the front panel ports belong to slot 0. Slot number starting from 1
each represents an interface card slot.
46
