Stacking
Stacking Chain Topology
Figure 20: Stacking Ring Topology
Most difficulties incurred in Ring topologies occur when a device in the ring becomes
After the stacking issues are resolved, the device can be reconnected to the stack without interruption, and the Ring topology is restored.
Stacking Chain Topology
If a failure occurs in the stacking topology, the stack reverts to Chain Stacking Topology. In the Chain topology, devices operate in a chain formation. The Stacking Master determines where the packets are sent. Each unit is connected to two neighboring devices, except for the top and bottom units.
Stacking Members and Unit ID
Stacking Unit IDs are essential to the stacking configuration. The stacking operation is determined during the boot process. The Operation Mode is determined by the Unit ID selected during the initialization process. For example, if the user selected
The device units are shipped with the default Unit ID of the
Unit ID 1 and Unit ID 2 are reserved for Master enabled units. Unit IDs 3 to 6 can be defined for stack members.
When the Master unit boots or when inserting or removing a stack member, the Master unit initiates a stacking discovering process.
Note
If two members are discovered with the same Unit ID the stack continues to function, however only the unit with the older join time joins the stack. A message is sent to the user, notifying that a unit failed to join the stack.
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