In contrast to routers, spanning tree bridges must have topologies with only one active path between two points. Shortest path bridging and TRILL (Transparent Interconnection of Lots of Links) are layer 2 alternatives to STP, which allow all paths to be active with multiple equal cost paths.

Types

Form factors

Switches are available in many form factors, including stand-alone, desktop units which are typically intended to be used in a

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