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4.12 Quality of Service
The switch provides a powerful Quality of Service (QoS) function to guide the packet forwarding in
four priority classes. The versatile classification methods can meet most of the application needs. The
following figure illustrates the QoS operation flow when a packet received on the ingress port until it
is transmitted out from the egress port:
Packet Priority Classification
Each received packet is examined and classified into one of four priority classes, Class 3, Class 2, Class 1 and
Class 0 upon reception. The switch provides the following classification methods:
802.1p classification: use User Priority tag value in the received IEEE 802.1Q packet to map to one priority
class
DSCP classification: use DSCP value in the received IP packet to map to one priority class
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