Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Administrator's Guide

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DiffServ 
322
Managed Switches 
d.  Click the gray boxes under ports 13 and 25 until T displays. 
The T specifies that the egress packet is tagged for the port.
e.  Click Apply.
3. 
Create a class class_vlan:
a. Select QoS > DiffServ > Advanced > Class Configuration
A screen similar to the following displays.
b.  Enter the following information: 
In the Class Name field, enter class_vlan.
In the Class Type list, select All.
c.  Click Add to create a new class class_vlan.
A screen similar to the following displays.
d.  Click class_vlan to configure this class.