bgp

• CloudFlare

• Each AS wishing to exchange routing information must have a registered autonomous system number (ASN).
• Internet Assigned Numbers Authority (IANA) assigns ASNs to Regional Internet Registries (RIRs), which then assigns them to ISPs and networks.
• Routes are exchanged and traffic is transmitted over the Internet using external BGP (eBGP). Autonomous systems can also use an internal version of BGP to route through their internal networks, which is known as internal BGP (iBGP). It should be noted that using internal BGP is NOT a requirement for using external BGP. Autonomous systems can choose from a number of internal protocols to connect the routers on their internal network.

关于路由，可以好好读读这个，有趣的内容

https://how-did-i-get-here.net/

A Tale of DNS & BGP: Facebook Outage Post Mortem Oct 2021))))

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