D-Link Xstack DES-3528 Series Reference Manual page 38

xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
Figure 2-26 Switches stacked in a Duplex Chain
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 DES-3528/DES-3552 Series.
NOTE: Only ports 27 and 28 of the DES-3528/DES-3552 Series, or ports 51 and ports 52 of DES-
3552/DES-3552P support stacking. The other ports cannot be used for stacking. For a stacking
disabled device, ports 27 and 28 of the DES-3528 Series, or ports 51 and ports 52 of DES-
3552/DES-3552P can be used as normal GE ports.
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 2-27 Switches stacked in a Duplex Ring
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