• Arista Spanning Tree User Manual : Docs

• Spanning Tree GFG : Article on GFG

• PPT made by me on Canva : PPT

The Spanning Tree Protocol (STP) is a network protocol used to prevent loops in Ethernet networks. Loops can cause broadcast storms, multiple frame copies, and unstable network behavior, so STP is essential for maintaining a healthy, loop-free network topology.

How Does STP Work?

STP works by designating a Root Bridge in the network. All switches then determine the shortest path to this root bridge, and any redundant or looping paths are blocked. If the primary path fails, STP automatically recalculates and opens a backup path, ensuring uninterrupted network connectivity.

• Root Bridge: The switch with the lowest bridge ID becomes the root bridge, and all path decisions are made in relation to this device.

• Bridge Protocol Data Units (BPDUs): These are messages exchanged between switches to identify the network topology.

• Blocking/Forwarding Ports: STP blocks redundant links and keeps one active path to the root bridge to prevent loops.

• Prevents network loops and broadcast storms.

• Improves network reliability by providing failover paths.

• Ensures efficient network traffic management.

STP is a foundational technology in switching, ensuring smooth and efficient data flow across complex networks.