D-Link DXS-3600 Series Reference Manual page 85

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch Web UI Reference Guide
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Duplex Ring - The duplex ring stacks switches in a ring or circle format where data can be
transferred in two directions. This topology is very resilient due to the fact that if there is a break
in the ring, data can still be transferred through the stacking cables between switches in the stack.
Within each of these topologies, each switch plays a role in the Switch stack. These roles can be set by
the user per individual Switch, or if desired, can be automatically determined by the Switch stack. Three
possible roles exist when stacking with the Switch.
Primary Master - The Primary Master is the leader of the stack. It will maintain normal operations,
monitor operations and the running topology of the Stack. This switch will also assign Stack Unit IDs,
synchronize configurations and transmit commands to remaining switches in the switch stack. The
Primary Master can be manually set by assigning this Switch the highest priority (a lower number denotes
a higher priority) before physically assembling the stack, or it can be determined automatically by the
stack through an election process which determines the lowest MAC address and then will assign that
switch as the Primary Master, if all priorities are the same. The Primary master are physically displayed
by the seven segment LED to the far right on the front panel of the switch where this LED will flash
between its given Box ID and 'H'.
Figure 4-61 Switches stacked in a Duplex Chain
Figure 4-62 Switches stacked in a Duplex Ring
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