FCC Issues Staff Report On T-Mobile Outage
https://www.fcc.gov/document/fcc-issues-staff-report-t-mobile-outage-0
The outage was initially caused by an equipment failure and then
exacerbated by a network routing misconfiguration that occurred when
T-Mobile introduced a new router into its network. In addition, the outage
was magnified by a software flaw in T-Mobile’s network that had been
latent for months and interfered with customers’ ability to initiate or
receive voice calls during the outage.
[...]
44. While fiber link failures are common, PSHSB finds that these steps,
taken together, will reduce the likelihood that a fiber link failure could
result in the recurrence of a similar event in TMobile’s network because
traffic would be routed to an alternative path that could handle it.
Moreover, if such an event recurred on T-Mobile’s network, it would not
cause such a large service disruption because T-Mobile would have improved
its networks’ ability to manage congestion in the case of a similar event
and would have increased network capacity to maintain the network in a
working state even with an increased volume of traffic.
