# Modifying an HVM Standard Network

## About this task

You can modify the **VLAN Trunks** and **Trunk Only** fields on an existing Standard Network after creation. You cannot modify the **VLAN ID**, **Resource Pool**, or **Router** fields.

## Procedure

1. Navigate to Infrastructure > Network > Networks.
2. Select the Standard Network to modify.
3. Click Edit.
4. Modify the following fields:

   - VLAN Trunks: Update the comma-separated list of trunk VLAN IDs or ranges (for example, `100,200-210`). The system provisions added VLANs on all hosts and removes deleted VLANs unless another network in the same cluster and OVS bridge still uses them.
   - Trunk Only: Toggle trunk-only mode on or off. The system removes the native VLAN tag from the OVS port when switching from Hybrid to Trunk-only, and it restores the native VLAN tag when switching back.
5. Click Save Changes.

## Results

The plugin updates the port group XML on all healthy hosts in the cluster to reflect the updated trunk VLAN configuration. It encodes all trunk VLAN IDs directly in a single port group per network using the `<vlan trunk='yes'>` XML element, and it does not create or delete separate port groups for individual trunk VLAN IDs.

- Added VLANs: The plugin updates the port group XML on each host to include the new trunk VLAN IDs.
- Removed VLANs: The plugin updates the port group XML on each host to remove the deleted trunk VLAN IDs.
- ArubaCX switches: The plugin coordinates with the Aruba CX Network Plugin to propagate the updated trunk VLAN configuration to connected Aruba CX switches, provided the Generic Integration plugin is configured for the cluster.
