D-Link DGS-3630 Series Reference Manual page 110

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide
The figure below illustrates how Switches can be stacked in a Duplex Ring formation using optical fiber cables
connected to SFP+ transceivers or DAC with SFP+ connectors where the 2-port stacking configuration is used.
NOTE: Stacking Input/Output logical port 1 (SIO1) and SIO2 are logical stacking port pairs. A logical
stacking port pair must always be connected to the same Switch in the stack. Splitting logical
stacking port pairs between different Switches in the stack might not guarantee a stable
stacking connection. See Stacking Bandwidth on page 101 for more information.
Switch Roles in a 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.
Figure 4-83 Duplex Ring stacking topology (SFP+)
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