"Although Bell and Telus offered to help, Rogers quickly determined that it would not be able to transfer its customers to its rivals’ networks because certain

"Although Bell and Telus offered to help, Rogers quickly determined that it would not be able to transfer its customers to its rivals’ networks because certain elements of the Rogers network, such as its centralized user database, were inaccessible as a result of the outage." It sounds like their control/management plane (with the user's database) was dependent on their data plane. So a data plane outage was more challenging to mitigate than it should have been in a decoupled architecture. Good lesson for any architecture.