How Verizon and a BGP Optimizer Knocked Large Parts of the Internet Offline Today

Border Gateway Protocol (BGP) - is a protocol to exchange routing tables
BGP optimizer: splits up IP prefixes into smaller (more specific) parts
Verison sent these rules into the internet
15% loss of global traffic
Verizon should have configured everything correctly long ago:
- Configure hard limit prefixes to be received
- IRR-based filtering
- RPKI framework with BGP Origin Validation (AT&T have enabld it)
- All these ideas are defined in the MANRS (Mutually Agreed Norms for Routing Security)
“And there’s no good reason, other than sloppiness or laziness” (about Verizon)
They fixed it by phone: calling the DQE to stop advertizing the incorrect BGP routes (screensot of phone calls is attached)

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