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4.5.7 Quality of Service
The device includes a number of QoS features related to providing low-latency guaranteed services to critical
network traffic such as voice and video in contrast to best-effort traffic such as web traffic and file transfers.
All incoming frames are classified to a QoS class, which is used in the queue system when assigning resources,
in the arbitration from ingress to egress queues and in the egress scheduler when selecting the next frame for
transmission.
The QoS class is assigned based on the class of service information, Priority Code Points (PCP, also known as
IEEE 802.1p) in the frame's VLAN tags and/or the Differentiated Service Code Points (DSCP) values from the
IP header. Both IPv4 and IPv6 are supported. If the frame is non-IP or untagged, the default QoS class is used.
Four QoS classes, Low/ Normal/ Medium/ High are defined in this device. The QoS class is used by the queue
system when enqueuing frames and when evaluating resource consumptions in packet switching operation.
The mapping table from PCP value to QoS class is configured globally for all ports.
The mapping table from DSCP to QoS class is also configured globally for all ports.
Configuration
QoS Mode
___________________________________________________________________________________ ________________________________________________________________
[Apply]
[Cancel]
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Description
Disable – Disable QoS function
802.1p - Enable 802.1p priority classification for VLAN tagged packets
DSCP - Enable DSCP priority classification for IP packets
Click to apply the configuration change
Click to cancel the configuration change
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