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PROmesh P9+
– User Manual
30
Quality of service
Quality of service (QoS) includes all procedures that influence the data flow in the device. With the
assignment to queues with different priorities, certain user data can be treated preferentially. For example,
real-time data, control data, audio or video data may be preferred over file transfers.
The switch supports eight different queues that are processed with different priorities. It is possible to use
only one of the classification methods listed below or to combine several.
Figure 15: Quality of service
QoS mode and priority scheme
The QoS mode distinguishes between the following settings:

Port based: You can set a priority for data transmission for each port and the switch will forward
the data packets of that port in accordance with your priority.

Classes based (COS): COS uses a data field present in the VLAN tag with priority information.
Eight different priority values from best effort (BE,0-low) to network Control (NC,7-high) are
specified. Assign the COS priorities to the switch
’s four queues as needed in your application.

Type based (TOS): TOS uses a differentiated services code point (DSCP) data field in the IP
header of packets that can have up to 64 different priorities. As with COS, you can use these
priorities to prioritize real-time control data, Voice over IP (VoIP), or audio data over normal data
transfer, for example. Adjust the settings to your requirements.

QoS mode:
o
Port-based only: Priorities are based only on the priority of the ports.