Segmentation waves that respect maintenance windows

Maintenance calendars are the hidden dependency of every segmentation program. We plot waves against freeze windows and customer-facing releases, not just “network Saturday.”

The second paragraph covers rollback rehearsals: if operators cannot rehearse a rollback in under thirty minutes, the wave is too large.

We end with observability: policy changes should emit a human-readable reason code so NOC staff can distinguish intentional blocks from misconfiguration.