Optus is blaming a software upgrade for a outage that let millions without phone connections and internet services. A 12-hour outage on Wednesday left 10 million individuals and businesses unable to make or receive calls, or complete transactions. The company said in a statement on Monday the cause was now known and steps had been taken to ensure it won't happen again. "At around 4.
"These routing information changes propagated through multiple layers in our network and exceeded preset safety levels on key routers which could not handle these. "This resulted in those routers disconnecting from the Optus IP Core network to protect themselves." The time taken to restore the system was longer than anticipated as some of the routers needed to be physically rebooted, requiring Optus staff to be deployed across a number of sites across the country.
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