STP

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
Spanning Tree and First-Hop Redundancy: Aligning STP with HSRP/VRRP
STP

Spanning Tree and First-Hop Redundancy: Aligning STP with HSRP/VRRP

The STP root bridge and the HSRP/VRRP active gateway should reside on the same switch. When they don't, traffic flows upstream to one switch and returns via another, wasting bandwidth and causing asymmetric path problems. This article covers alignment strategy and verification.
STP in Multi-Layer Campus Designs: Access, Distribution, and Core
STP

STP in Multi-Layer Campus Designs: Access, Distribution, and Core

In a three-layer campus, STP topology must align with the physical hierarchy. This article shows how to place root bridges, design inter-layer redundancy, and troubleshoot anomalous topologies created by misconfiguration across access, distribution, and core layers.
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