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Update IPAM model documentation

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Jeremy Stretch
2020-07-30 12:55:51 -04:00
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docs/models/ipam/vrf.md
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# Virtual Routing and Forwarding (VRF)
A VRF object in NetBox represents a virtual routing and forwarding (VRF) domain. Each VRF is essentially a separate routing table. VRFs are commonly used to isolate customers or organizations from one another within a network, or to route overlapping address space (e.g. multiple instances of the 10.0.0.0/8 space).
A VRF object in NetBox represents a virtual routing and forwarding (VRF) domain. Each VRF is essentially a separate routing table. VRFs are commonly used to isolate customers or organizations from one another within a network, or to route overlapping address space (e.g. multiple instances of the 10.0.0.0/8 space). Each VRF may be assigned to a specific tenant to aid in organizing the available IP space by customer or internal user.
Each VRF is assigned a unique name and an optional route distinguisher (RD). The RD is expected to take one of the forms prescribed in [RFC 4364](https://tools.ietf.org/html/rfc4364#section-4.2), however its formatting is not strictly enforced.
Each prefix and IP address may be assigned to one (and only one) VRF. If you have a prefix or IP address which exists in multiple VRFs, you will need to create a separate instance of it in NetBox for each VRF. Any IP prefix or address not assigned to a VRF is said to belong to the "global" table.
Each prefix and IP address may be assigned to one (and only one) VRF. If you have a prefix or IP address which exists in multiple VRFs, you will need to create a separate instance of it in NetBox for each VRF. Any prefix or IP address not assigned to a VRF is said to belong to the "global" table.
By default, NetBox will allow duplicate prefixes to be assigned to a VRF. This behavior can be disabled by setting the "enforce unique" flag on the VRF model.
By default, NetBox will allow duplicate prefixes to be assigned to a VRF. This behavior can be toggled by setting the "enforce unique" flag on the VRF model.
!!! note
Enforcement of unique IP space can be toggled for global table (non-VRF prefixes) using the `ENFORCE_GLOBAL_UNIQUE` configuration setting.