QTECH QSW-8300 Инструкция по настройке - Manual (Page 110)

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14.1.2 Basic Egress QoS Model
Classification scheduling Remark Policing
Generate
internal
priority
Ingress Egress
color
Sort packet traffic
according to the
classification info and
convert classification info
to internal priority value
and drop precedence
value
Decide whether traffic
color is single bucket
dual color or dual
bucket three color
according policing
policy
Degrade or discard
different color packets,
and remark DSCP,
TOS, COS fields
Place packets into priority
queues according to
internal priority, provide
the service for them
according to queue weight
and drop precedence
Policing and
remark of
Egress
Set the color of packet
traffic according to policing
policy of Egress
PolicyMap, degrade or
drop different color
packets
According to the characters (including field values like COS and DSCP) of upstream packets,
policing and rewriting of Egress make the last QoS change on the packet prior to the packet
egress.
Policing configures different policing policy based on the flow and distributes bandwidth for the
flow classified. The distribution policy of bandwidth can be either dual bucket dual color or dual
bucket three color. Different colors can be assigned to different flows and approaches of
discard or passage can be chosen for them; you can add rewriting action for packets with
passage approach chosen. See the following flow chart for detailed description of Egress QoS: