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EIGRP

EIGRP Neighbor Requirements: The 5 Things That Must Match

The 5 things that must match for EIGRP routers to become neighbors: subnet, AS number, K-values, authentication, and process membership. Plus what does NOT need to match.

Jun 12, 2026 5 min read

STP

Per-VLAN Spanning Tree (PVST+ and Rapid-PVST+) Explained

Per-VLAN Spanning Tree explained: PVST+ vs Rapid-PVST+, the sys-id-ext Bridge ID trick, per-VLAN root placement for uplink load balancing, and when to move to MSTP.

Jun 10, 2026 5 min read

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Labs

Lab auto-07 - Capstone: Automated Config Backup and Drift Detection

Every network has a network engineer who swears nothing changed, and a network that disagrees. This capstone builds the tool

Jun 10, 2026 5 min read

Learn networking by building it

Blog

EIGRP Neighbor Requirements: The 5 Things That Must Match

Per-VLAN Spanning Tree (PVST+ and Rapid-PVST+) Explained

Lab auto-07 - Capstone: Automated Config Backup and Drift Detection

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