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# Classification Group

The **Classification Group** tab lets you manage groupings of [QoS classes](/glossary/q/qos_class).

classgroup blocks are used to define different class groupings. This is only really useful if you wish to have multiple interfaces with different class considerations, for example, you might want eth1 to have an ultrapriority class or something.


This is useful when you have multiple [interfaces](/glossary/n/network_interface) and want to manage classes differently for them.

## Overview

At the top of the page is a list of selectable classification groups.

When a particular group is selected, details about it is shown in the configuration section.

^ Item ^ Description ^ Comment ^
| Default Class | Class to use as fallback if packets don't match any other class. |
| Classes | Classes to include in the group. | **Note:** You need to [create a class](../class/start) for it to be available in the list. |

The **Default** Classgroup contains these [standard classes](../class/classes):
- **Priority**
- **Express**
- **Normal**
- **Bulk**