Spanning Tree Protocol

Spanning Tree Protocol (STP)

A protocol that prevents switching loops in Ethernet networks

IEEE 802.1d

The original standard for Spanning Tree Protocol

Network Loop

A condition where frames continuously circulate through a network

Loop-Free Topology

A network design with no switching loops

Switch

A network device that forwards frames based on MAC addresses

STP Convergence

The process of STP recalculating the network topology after a change

Blocking State

An STP port state where frames are not forwarded

Listening State

An STP port state where the switch listens for topology information but does not forward frames

Learning State

An STP port state where MAC addresses are learned but frames are not forwarded

Forwarding State

An STP port state where frames are forwarded normally

Root Port

The port on a switch with the best path to the root bridge

Designated Port

The port chosen to forward traffic for a network segment

Blocked Port

A port disabled by STP to prevent loops

Root Bridge

The central switch elected by STP as the reference point for the topology

Bridge ID

A value used by STP to elect the root bridge

Topology Change

A network change that requires STP to recalculate paths

Redundant Link

An extra network connection used for backup and reliability

Failover

The process of switching to a backup path after a failure

MAC Address Table

A table storing MAC addresses and associated switch ports

Broadcast Storm

A network overload caused by excessive broadcast traffic

Frame Flooding

The excessive forwarding of frames caused by switching loops

Convergence Time

The amount of time required for a protocol to adapt to network changes

Rapid Spanning Tree Protocol (RSTP)

A faster version of STP designed for quicker convergence

IEEE 802.1w

The standard for Rapid Spanning Tree Protocol

Port State

The operational condition assigned to a switch port by STP

Topology Recalculation

The process of STP relearning and updating the network layout

Ethernet Network

A network based on Ethernet communication standards

Loop Prevention

The process of stopping switching loops in a network

Forwarding Port

A switch port actively forwarding traffic

Disabled Path

A redundant connection blocked by STP until needed

Network Redundancy

The use of backup connections to improve reliability

Switching Loop

A loop formed between switches causing repeated frame circulation

Root Path Cost

The cumulative cost to reach the root bridge

Bridge Protocol Data Unit (BPDU)

STP messages exchanged between switches to share topology information

STP Port Role

The classification assigned to a port by STP

Backup Path

A secondary connection activated during a network failure

Network Stability

The ability of a network to operate consistently without disruptions