D-Link DGS-3630-28SC Web UI Reference Guide 2 - 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. Figure 4-83 Duplex Ring stacking topology (SFP+) 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. 98