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20 lines
657 B
Markdown
20 lines
657 B
Markdown
# ASN
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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.
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ASNs must be globally unique within NetBox, must each may be assigned to multiple [sites](../dcim/site.md).
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## Fields
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### AS Number
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The 32- or 64-bit AS number.
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### RIR
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The [Regional Internet Registry](./rir.md) or similar authority responsible for the allocation of this particular ASN.
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### Sites
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The [site(s)](../dcim/site.md) to which this ASN is assigned.
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