Singtel, Optus' parent company, to blame for sending dodgy route info

The Sydney Morning Herald has news that the "third party" Optus reckons sent it dodgy router info that crashed its entire network is actually the Singtel Internet Exchange. If you don't know, Singtel own Optus. Apparently Optus are keeping it quiet because a bunch of Singtel execs are in Australia right now and Optus doesn't want to embarrass them. It's still not cool that Optus blindly accepted these changes, but it probably explains why they were so cagey in giving proper details last week. Also in the SMH article is a Telstra exec quoted as saying "Telstra's executives carry SIM cards of other carriers with them in the event of a Telstra outage". Makes sense to me, but does Optus not do this basic redundancy practice? Dual SIM phones aren't exactly rare.