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SESK: Stuff Everyone Should Know · sesk.info/tech-bgp-between-autonomous-systems

What kind of routing protocol is BGP?

BGP is an inter-Autonomous System routing protocol.

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  1. A local Ethernet framing protocol
  2. A Wi-Fi encryption protocol
  3. An inter-Autonomous System routing protocol ✔

Why: BGP exchanges network reachability information between autonomous systems, such as large provider or enterprise networks. That information lets each system apply policy when selecting routes to advertised prefixes.

Huh, didn't know that: An autonomous system is identified in BGP by an Autonomous System number.

The dad joke
BGP crossed network borders with all its routes in order.
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References

Answer: An inter-Autonomous System routing protocol. BGP exchanges network reachability information between autonomous systems, such as large provider or enterprise networks. That information lets each system apply policy when selecting routes to advertised prefixes.

  1. RFC 4271: A Border Gateway Protocol 4 www.rfc-editor.org/rfc/rfc4271.html
    The Border Gateway Protocol (BGP) is an inter-Autonomous System routing protocol.
    Checked 2026-10-10.

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