Physical Layer
The Excavator Doesn't Care About Your Diversity We'd done everything right. Diverse and multiple fiber paths to our remote site. Different physical routes. Different carriers. Different entry points. Textbook diversity - real diversity, not just on paper. Then an improbable confluence of circumstances hit. Multiple failures,
Physical Layer
We need to talk about the most dangerous comfort blanket in enterprise IT: Dual Homing. If you spend enough time in this industry, you will eventually file a Root Cause Analysis for a total blackout on a "fully redundant" backbone. We do not talk about these incidents publicly.
Physical Layer
Your contract says you have two separate paths. Your routing table shows two distinct IS-IS adjacencies formed over independent circuits, with the LSDB confirming unique paths to the remote site. Your logical diagrams look flawless, and your auditor just happily checked the box for high availability. Then a guy in