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This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. Internet routing system An autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators on behalf of a single administrative entity or domain, that presents a common and clearly defined routing policy to ...
A person, or workgroup, who is connected to an Internet service provider (ISP), by only one router, is a stub network with respect to the ISP. This stub network is part of the ISP's autonomous system (AS), discussed below.
It is common practice, in a multihomed but stub (i.e., non-transit) autonomous system, [5] for the BGP-speaking router(s) to take "full routes" from the various ISPs to which the AS is multihomed. Especially if there is more than one router connected to the same ISP, a common practice, it will receive more routes than are in the DFZ.
The original Internet backbone was the ARPANET when it provided the routing between most participating networks. The development of the British JANET (1984) and U.S. NSFNET (1985) infrastructure programs to serve their nations' higher education communities, regardless of discipline, [7] resulted in the NSFNet backbone by 1989.
When it runs between different autonomous systems, it is called External BGP (eBGP or Exterior Border Gateway Protocol). Routers on the boundary of one AS exchanging information with another AS are called border or edge routers or simply eBGP peers and are typically connected directly, while iBGP peers can be interconnected through other ...
An autonomous system boundary router is a router that is connected by using more than one routing protocol and that exchanges routing information with routers autonomous systems. ASBRs typically also run an exterior routing protocol (e.g., BGP), or use static routes, or both. An ASBR is used to distribute routes received from other, external ...
The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet Protocol–related symbols and Internet numbers.
The Internet is a collection of separate and distinct networks referred to as autonomous systems, each one consisting of a set of globally unique IP addresses and a unique global BGP routing policy. The interconnection relationships between Autonomous Systems are of exactly two types: