Intro to BGP

  • by NetSwag 1

    • http://https://youtu.be/y0XLmascSnw

    BGP Quick Hitters:

    • BGP stands for Border Gateway Protocol, which is an Internet Engineering Task Force (IETF) standard.  
    • It is the routing protocol responsible for advertising, learning, and calculating the best paths throughout the internet.  
    • BGP uses a routing best path protocol, based on distance vector routing algorithm.  Exchanges routing information over TCP.
      • TCP meets all transport requirements.
        • Supports fragmentation, sequencing, and reliability of packets
      • TCP is supported in pretty much all commercial routers, switches, and hosts.
      • Uses port 179.
    • Used across the internet by Internet Service Providers (ISPs) for border/perimeter routers.
    • According to RFC 1771, an autonomous system is: 
      • a set of routers under a single technical administration, using an interior gateway protocol  (IGP) and common metrics to route packets within the AS, and using an exterior gateway protocol to route packets to other ASs
      • This has since been extended to include multiple IGPs and several sets of metrics who’s administration seems to be under one coherent interior routing plan.

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