LG niagara4 MultiSITE Edge 10 User Manual page 15

Ring
This configuration is the same as the daisy chained topology, except that the last controller in the chain is connected by its
secondary port back into the same switch as the first controller. RSTP is used to prevent "packet storms" (i.e. excessive traffic)
due to the connection loop.
Figure 4: Ring network topology
These basic topologies can be combined as necessary to construct larger networks of controllers. For example, multiple sets of
daisy chained controllers could be connected back to central switch, forming a star of daisy chained controllers.
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MS- E10 User Guide
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