Dell PowerEdge M420 Configuration Manual page 502

5 To add a port to the Ports Depended On column, click the port in the
Available Ports column, and then click the > button to the right of the
Available Ports column.
In the following example, Group 1 is configured so that Port 3 is
dependent on Port 4.
Figure 18-5. Link Dependency Group Configuration
6 Click Apply.
The Link Dependency settings for the group are modified, and the device
is updated.
502
Configuring Port Characteristics