# Configure network build items on blueprints

> Add a network build item to a blueprint so that ordering it creates an NSX-T network and attaches the new servers to it

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Site [llms.txt](/llms.txt)

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With a network build item, the blueprint carries the network alongside the servers, and both are created when someone orders it.

## Before you start

- Connect an NSX-T manager and map it to a vCenter resource handler. See [Network virtualization](/docs/cmp/configure/infrastructure/networks/network-virtualization/) and [Manage network virtualization](/docs/cmp/configure/infrastructure/networks/network-virtualization/manage/).
- Give the blueprint a resource type. A blueprint with a resource type of **None** cannot carry a network build item.
- Add at least one server build item.

<div class="alert alert-info" role="alert">


The **Network** button appears on the **Build** tab only once an NSX-T mapping has a resource handler attached. If you cannot see it, check the mapping.
</div>


## Add a network build item

1. Open the blueprint and select the **Build** tab.
1. Select **Network**.
1. Complete the form.
1. Select **Save**.

| Field | Description |
| --- | --- |
| **Name** | A name for the build item. |
| **IPv4 Block** | The IPv4 range for the new network, in CIDR notation. CMP creates the subnet from this. |
| **Provide NAT for servers** | Give servers in the targeted tiers NAT'd addresses. Off by default. |
| **Server Tiers** | The server tiers to put on this network when they are provisioned. Select at least one. |
| **Rate** | An optional network cost, shown on the order form. The label names the currency and period configured for your instance. See [Rates](/docs/cmp/configure/order-forms-and-pricing/rates/). |

Place the network build item **above** the server build items it serves, so the network exists before the servers that join it.

## What happens when the blueprint is ordered

- Cloud Management Platform (CMP) creates a subnet from the **IPv4 Block**.
- If exactly one Tier-1 gateway is associated with the environment being deployed to, CMP uses it. If there are none or several, CMP creates a new Tier-1 gateway.
- CMP creates the network segment in the environment's transport zone and attaches it to the Tier-1 gateway. When CMP creates a new Tier-1 gateway, it links the gateway to the environment's Tier-0 gateway, so the environment must have exactly one Tier-0.

Which transport zone and gateways an environment has comes from what you imported and associated in [Manage network virtualization](/docs/cmp/configure/infrastructure/networks/network-virtualization/manage/).

## Related

- [Manage network virtualization](/docs/cmp/configure/infrastructure/networks/network-virtualization/manage/): Import the transport zones and gateways.
- [Build configuration](/docs/cmp/use/blueprints/build/build-configuration/): How build items work on a blueprint's Build tab.
- [Rates](/docs/cmp/configure/order-forms-and-pricing/rates/): How the rate on a build item is priced and displayed.