BGP configuration is mechanically simple. The command set is small, and a basic peering comes up in half a dozen lines. What trips people up is not the syntax, it is the handful of non-obvious requirements: eBGP and iBGP
Every Cisco AP mode explained: Local, FlexConnect, Monitor, Sniffer, Rogue Detector, SE-Connect, Bridge and Mesh. What each does and when to use it.
SR-MPLS keeps the MPLS data plane and drops LDP and RSVP-TE. Prefix-SIDs, adjacency-SIDs, source-routed label stacks, SR-MPLS vs SRv6, and why networks migrate.
How VTP propagates VLANs across a domain, the three modes, the revision-number disaster, v1/v2/v3 differences, and why many engineers disable 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.
This is Part 2 of the PingLabz 9800 Wireless Labs series. In Part 1 we built the topology in Cisco Modeling Labs: a 9800-CL, a small IOL XE campus underneath it, a bridge to a physical AP, and CML&
This is Part 1 of the PingLabz 9800 Wireless Labs series. Over the next several posts (and matching YouTube videos), we build a complete Catalyst 9800-CL wireless environment from scratch in Cisco Modeling Labs - starting with an empty canvas
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.
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.
Every network has a network engineer who swears nothing changed, and a network that disagrees. This capstone builds the tool that settles the argument: an automated backup and drift detector that snapshots every device config to a golden baseline, re-
Everything you have scripted so far in this series has been imperative: do this, then this, on these devices. Configuration management tools flip the model. You declare the state you want, and the tool figures out whether anything needs doing.