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A comment on Internet traffic for Google, Facebook, Apple was briefly rerouted to Russia. Parent comment

Re:Internet traffic for Google, Facebook, Apple was briefly ... by pas on Wednesday December 13, 2017 @08:51AM (#15914167)
Why can't higher Tier ISPs require that each prefix they get from downstream must be recorded in some DB and do the lookup before [propagating the prefix and] installing the forwarding table entries?
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Re:Internet traffic for Google, Facebook, Apple was briefly ... by topranks on Wednesday December 13, 2017 @12:14PM (#15915591)
They generally do for their direct end-customers who announces their own address space.

The problem is when peering with other Tier 1's and large ISPs, with multiple downstream customers. How do they keep and update a list of the other ISPs customers and the routes they should expect from them?

Once someone manages to get a bogus route into a large ISPs table it tends to propagate further.

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