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OSPF

OSPF Passive Interface: What It Does and Where to Use It

OSPF passive-interface stops Hellos and adjacencies on an interface but still advertises its subnet. Config, the default pattern, and the route-filter gotcha.

Jun 15, 2026 4 min read

Wireless

Catalyst 9800-CL Day 0 Configuration, Line by Line (9800 Series Part 2)

This is Part 2 of the PingLabz 9800 Wireless Labs series. In Part 1 we built the topology in Cisco

Jun 12, 2026 7 min read

Wireless

Build a Catalyst 9800-CL Wireless Lab in Cisco Modeling Labs (9800 Series Part 1)

This is Part 1 of the PingLabz 9800 Wireless Labs series. Over the next several posts (and matching YouTube videos)

Jun 12, 2026 5 min read

Learn networking by building it

Blog

OSPF Passive Interface: What It Does and Where to Use It

Catalyst 9800-CL Day 0 Configuration, Line by Line (9800 Series Part 2)

Build a Catalyst 9800-CL Wireless Lab in Cisco Modeling Labs (9800 Series Part 1)

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