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Update IPAM models documentation

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jeremystretch
2022-08-16 15:32:00 -04:00
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docs/models/ipam/asn.md
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# ASN
ASN is short for Autonomous System Number. This identifier is used in the BGP protocol to identify which "autonomous system" a particular prefix is originating and transiting through.
An Autonomous System Number (ASN) is a numeric identifier used in the BGP protocol to identify which [autonomous system](https://en.wikipedia.org/wiki/Autonomous_system_%28Internet%29) a particular prefix is originating and transiting through. NetBox support both 32- and 64- ASNs.
The AS number model within NetBox allows you to model some of this real-world relationship.
ASNs must be globally unique within NetBox, must each may be assigned to multiple [sites](../dcim/site.md).
Within NetBox:
## Fields
* AS numbers are globally unique
* Each AS number must be associated with a RIR (ARIN, RFC 6996, etc)
* Each AS number can be associated with many different sites
* Each site can have many different AS numbers
* Each AS number can be assigned to a single tenant
### AS Number
The 32- or 64-bit AS number.
### RIR
The [Regional Internet Registry](./rir.md) or similar authority responsible for the allocation of this particular ASN.
### Sites
The [site(s)](../dcim/site.md) to which this ASN is assigned.