STP

Spanning Tree Protocol, the loop-prevention mechanism that keeps Layer 2 networks stable. Articles tagged STP cover port roles and states, RSTP and MST, root bridge configuration, BPDU Guard and Root Guard hardening, and Cisco Catalyst troubleshooting.

28 posts

STP

STP Port States: Blocking, Listening, Learning, Forwarding, and Disabled

STP port states control when a port begins forwarding traffic. The five states and their transitions define convergence time. Understanding state machine timers is essential to designing networks that recover quickly from failures.

Mar 27, 2026 7 min read

STP

STP Port Roles Explained: Root, Designated, Blocked, and Alternate

STP port roles determine which ports forward traffic and which block. Understanding root, designated, blocked, and alternate ports is essential to predicting network behavior and troubleshooting convergence issues.

Mar 27, 2026 6 min read

STP

What Is Spanning Tree Protocol (STP)? The Bridge Loop Problem Explained

Spanning Tree Protocol is the foundation of loop-free switched networks. Without it, redundant links create broadcast storms and MAC table corruption. This article explains the bridge loop problem and how STP solved it.

Mar 27, 2026 5 min read

STP

Cisco PVST Guide: Spanning Tree for Every VLAN

Master PVST (Per-VLAN Spanning Tree) on Cisco switches — learn configuration, root bridge design, port roles, and common troubleshooting tips.

Dec 23, 2024 3 min read