SHARAFAT ALI-8305012450 1 Spanning Tree Protocol (STP) A protocol which creates redundancy in Network topology like inverted Tree Structure. An inverted Tree has no loops and every branch connect to its Root Same like Tree structure in spanning Tree enables network all devices are connected to its main device like Root Bridge by its Root Port. STP used in switches to turn on redundancy in topology. Block unwanted links /ports. By default Switches run STP, no needed any configuration. STP Uses an algorithm called Spanning Tree Algorithm (STA) to make the selection of which port should be shutdown. STA also decide some more selection using by STP. Select a switch to “Root Bridge” Select port as “Root Port “to each switch towards Root Bridge. Select ports as “Designated Ports “– active ports getting data downwards from Root Bridge. Take the decision of which unwanted ports should be in Block state to prevent a loop in topology .means select Non-designated/Backup Ports in topology.
SHARAFAT ALI-8305012450 2 How STP Select Root Bridge/Main Switch in topology using STA (Spanning-Tree Algorithm):- Root Bridge/Switch can be chosen from other switches in topology by identifying Bridge ID.
- Summer '20
- root bridge, root port