Reports from a third party ISP is that Optus are flying technicians to at least eight sites across the country, and that it’s a problem with their BGP route reflectors. Facebook faced a similar problem last year IIRC.
“Our on-site technician is actively prioritising establishing a console connection [a physical cable connection],” the message to Optus’ partners early on Wednesday said. “Rest assured that said technician is also being provided additional technical support remotely.”
[1] https://www.smh.com.au/technology/what-caused-the-optus-outa...