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a connected group of one or more Internet Protocol prefixes run by one or more network operators, used for loop prevention.
On the Internet, an autonomous system (AS) is the unit of router policy, either a single network or a group of networks that is controlled by a common network administrator (or group of administrators) on behalf of a single administrative entity. You need AS numbering in WAN to identify which group/network they belong to. In configuring routers the same AS number will be able to communicate with each other.
Autonomous-system # you can say it is a company under the same network administration.... diff companies has different as #.....
for WAN Network AS number is used for loop prevention . and extra.
Autonomous System is a collection of networks under a single administrative domain.
An autonomous system number (ASN) is a unique number that's available globally to identify an autonomous system and which enables that system to exchange exterior routing information with other neighboring autonomous systems.
Autonomous system numbers range from 1 to 65,535. (64512-65535 is a private range allocated by IANA). Autonomous system numbers can be assigned only through a request to the local Internet registry.
Autonomous System Numbers are used by various routing protocols for exchange of exterior routing information (between neighboring Autonomous Systems) and as an identifier of the AS itself.
An AS is a group of IP networks operated by one or more network operator(s) that has a single and clearly defined external routing policy.
Exterior routing protocols are used to exchange routing information between Autonomous Systems.
A Public AS Number is required only when an AS is exchanging routing information with other Autonomous Systems on the public Internet. That is, all routes originating from an AS is visible on the Internet.
A Private AS Number should be used if an AS is only required to communicate via Border Gateway Protocol with a single provider. As the routing policy between the AS and the provider will not be visible in the Internet, a Private AS Number can be used for this purpose.
IANA has reserved AS64512 through to AS65535 to be used as private AS Numbers.
An autonomous system (AS) is the unit of router policy, either a single network or a group of networks that is controlled by a common network administrator (or group of administrators) on behalf of a single administrative entity (such as a university, a business enterprise, or a business division). An autonomous system is also sometimes referred to as a routing domain. An autonomous system is assigned a globally unique number, sometimes called an Autonomous System Number (ASN).
