Ordering diverse links
Ah yes, reminds me of the BT Manchester tunnels fire causing unexpected outages. Ordering seemingly diverse links from a provider doesn’t guarantee they’re diverse, even if they are ordered from different providers. Once mapped to physicals, they often turn out to be in the same duct.
The only way to know is to demand exact routing information or pay a premium for diversity and pray they actually provide it
https://www.theguardian.com/uk/2004/mar/30/simonjeffery
Biting the hand that feeds IT
