Loop Prevention

Timeline Showing Older Cisco Platforms Defaulting To Pvst+ And Current Catalyst Hardware Defaulting To Rapid Pvst+
CCNA

How to Configure Spanning-Tree Mode: Rapid PVST+

Rapid Per-VLAN Spanning Tree Plus (Rapid PVST+) is Cisco’s per-VLAN implementation of RSTP, and it’s the default spanning tree mode on current Cisco Catalyst hardware, including the 9300 and 9500 series running IOS-XE. This guide walks through configuration, verification, and troubleshooting on Cisco Catalyst switches — whether simulating in Packet Tracer or deploying in production....

Muhammad Khattak 8 min read
Triangular Network Topology Of Three Switches With One Glowing Gold Switch Marked As The Elected Root Bridge And A Blocked Redundant Link Shown Dimmed
CCNA

Spanning Tree Bridge ID Configuration: Root Primary and Root Secondary Explained

When configuring a specific switch as the root bridge, its bridge ID priority value must be lower than the bridge priority values of all other switches on the network — in Spanning Tree Protocol (STP), a lower priority value always wins the root bridge election. There are two different methods for configuring the bridge priority...

Muhammad Khattak 9 min read
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