Optus identifies cause of nationwide outage, says ‘changes to routing information’ after software upgrade are to blame

Optus says “changes to routing information” following a “routine software upgrade” were to blame for last week’s nationwide outage, which affected 10.2 million Australians and 400,000 businesses.

In a statement released on Monday afternoon, Optus said its network was affected by “changes to the routing information of an international peering network” at around 4:05am AEDT last Wednesday, “following a routine software upgrade”.

“These changes to routing information propagated through multiple layers in our network and exceeded preset security levels on key routers that could not handle them,” the company said.

“This resulted in the routers disconnecting from the Optus IP Core network to protect themselves.”

The extent of the outage meant Optus engineers had to physically reconnect or restart the system, the telco said, and also meant the investigation into the cause “took longer than we would have liked”.

“The restoration required a large-scale effort from the team and in some cases required Optus to physically reconnect or reboot routers, requiring people to be sent to a number of locations in Australia,” an Optus spokesperson said.

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