D-Link DXS-3400 User Manual - Page 94

DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide Figure 4-78Duplex Ring stacking topology (RJ45) The figure below illustrates how Switches can be stacked in a Duplex Ring formation using optical fiber cables connected to SFP+ transceivers or Direct Attached Cables (DAC) with SFP+ connectors where the 2-port stacking configuration is used. Figure 4-79Duplex Ring stacking topology (SFP+) NOTE:SIO1 is a logical stacking port pair. SIO2 is also a logical stacking port pair. 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. 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. The 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 84