Network Routing

BGP

• Autonomous System (AS)

  • A collection of IP networks and routers under the control of one entity

  • Each AS is assigned a globally unique number, the Autonomous System Number (ASN)

  • Another name for AS in the Internet is routing domains.

  • Gist

    • The basic idea behind AS is to provide an additional way to hierarchically aggregate routing information in a large internet, thus improving scalability.