Datto Switches: Quality of Service (QoS)



This article describes how to configure and implement Quality of Service (QoS) using Datto Switches.


  • Datto Switches


Quality of service (QoS) allows operators to prioritize application traffic to ensure latency affected data, such as VoIP, and video conferencing, is uninterrupted in a congested network. Datto Switches implements this by reading tagged packets, and prioritizing them accordingly. Packets are classified using Class of Service (CoS) on the data link layer, and Differentiated Services Code Points (DSCP) on the network layer, mapped to a queue, then sent out accordingly as per QoS.



1. Navigate to a device web session for your switch.

2. Click on Switch Settings.

Figure 1: Switch Settings

3. Click on the Quality of Service (QoS) dropdown to reveal settings, and click the Enable checkbox to interact with them.

Figure 2: Enabling QoS

4. Click Save Switch Settings to save all modified settings.

Configuring QoS

The following settings will allow you choose what the switch will use for QoS, how traffic is weighted, and what queues are mapped:

Figure 3: QoS Settings

Trust Mode: Allows you to define whether the switch will use CoS, DSCP, or both trust modes for QoS.

Scheduling Method: Allows you to define what method the switch will use when assessing transmitting incoming packets in queues. Strict priority always prioritizes queues with a higher priority, while Weighted Round Robin (WRR) weights each queue by priority, then applies a round robin policy when choosing packets for transmission.

Queue Mapping: Tagged packets are sent to queues defined in this setting. For each CoS or DSCP value, you can choose what queue these tagged packets are mapped to.

Figure 4: CoS Queue Mappings

Figure 5: DSCP Queue Mappings

Port Specific Settings

If QoS is enabled in Switch Settings, you can configure additional settings per port. To navigate to these settings:

1. Click Port Settings.

Figure 6: Port Settings

2. Select the desired port, then click Configure.

Figure 7: Choosing a port

3. Click on the Quality of Service (QoS) dropdown to reveal settings.

Figure 8: Enabling QoS

4. Click Save Switch Settings to save all modified settings.

The following CoS settings are available per port:

Figure 9: QoS port settings

CoS Value: All incoming packets that lack a CoS value will use the one set in this dropdown.

Trust CoS: If checked, the switch will queue packets tagged with CoS into their designated queues. If unchecked, all packets will leave the same queue.

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