# Why are some interfaces in the unmanaged state?

## An interface may be in the unmanaged state due to the following reasons:

### Unmanaged manually

**Cause:** The user would have manually chosen to unmanage the interface/device.

**Solution:** Managing and unmanaging of devices can be done individually or in bulk. To unmanage/manage devices in bulk, go to **Settings -> Configuration -> Quick Configuration Wizard -> Manage/Unmanage.** Select the set of devices and perform the necessary action. You can also perform the same action for individual devices from their respective snapshot pages.

### The selected interface may be a subinterface

**Cause:** The discovered/listed interface may be a subinterface. A subinterface is a virtual interface created by dividing one physical interface into multiple logical interfaces. A subinterface in a router uses the parent physical interface for sending and receiving data.

**Solution:** As of now, OpManager does not manage those interfaces which are listed as sub-interfaces. These interfaces will only be shown as unmanaged.

### Parent/dependent device may be down

**Cause:** The parent/dependent device may be down or associated with an active Device Downtime Schedule. If the dependent device is associated with a downtime schedule (or unmanaged manually), the child device and its interfaces will also be moved to unmanaged state for that particular period.

**Solution:** Remove the particular device from the Downtime Schedule to start monitoring the interface.

---

## Frequently asked questions:

1. [How to configure device downtime scheduler?](https://www.manageengine.com/network-monitoring/kb/device-downtime-schedules.html)
2. [What are the availability protocols available in OpManager?](https://www.manageengine.com/network-monitoring/kb/device-availability-monitoring-protocols.html)
3. [What are the different availability states available in OpManager?](https://www.manageengine.com/network-monitoring/kb/device-availability-state.html)
4. [How to configure device down settings?](https://www.manageengine.com/network-monitoring/kb/device-down-settings.html)
5. [How do I configure Admin/Operation severity?](https://www.manageengine.com/network-monitoring/faq/admin-operdown-severity.html)
6. [What is the purpose of uplink dependency?](https://www.manageengine.com/network-monitoring/faq/device-dependency.html)
7. [How to calculate device availability uptime?](https://www.manageengine.com/network-monitoring/faq/calculate-device-availability-uptime.html)
8. [How do I disable interface status polling?](https://www.manageengine.com/network-monitoring/faq/interface-statuspolling-disable-snapshot.html)