Spanning Tree Protocol (STP)


Spanning Tree Protocol (STP)

STP Overview

In Layer 2 domain, redundancy is an important case. To provide redundant links, we need multiple connections between switches. But this redundancy mechanism can cause an undesirable situation that is called “L2 Loop”. To provide L2 redundancy and to avoid L2 loops, Spanning Tree Protocol (STP) has been developed.

During the development period of STP, network protocol developers created various versions of STP. They have created different standards beside Cisco specific versions. These STP versions are :

STP (Spanning Tree Protocol) – 802.1D
RSTP (Rapid Spanning Tree Protocol) – 802.1W
PVST+ (Per VLAN Spanning Tree Plus) – Cisco Proprietary
Rapid PVST+ (Rapid Per VLAN Spanning Tree Plus) – Cisco Proprietary
MST (Multiple Spanning Tree) – 802.1s

In this article, mainly we will focus on STP (802.1D).

Redundant Layer 2 Problems

Redundancy is an important term for a network. Layer 2 Redundancy is also important but need more caution. Without a mechanims like STP, Layer 2 Redundancy mechanisms can cause the below problems:

• Layer 2 Loops and Broadcast Storms
• MAC Address Instability
• Duplicate Frame Transmission

Let’s talk about each of these Layer 2 Redundacy problems.

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Lesson tags: STP, Spanning Tree
Back to: CCNA > Spanning Tree Protocol

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