Basic Qos Model - Edge-Core ES3628EA User Manual

If devices of each hop in a network support differentiated service, an end-to-end
QoS solution can be created. QoS configuration is flexible, the complexity or simplicity
depends on the network topology and devices and analysis to incoming/outgoing traffic.

8.1.3 Basic QoS Model

The basic QoS consists of five parts: Classification, Policing, Remark, Queuing and
Scheduling, where classification, policing and remark are sequential ingress actions, and
Queuing and Scheduling are QoS egress actions.
Classification
Sort the packet traffic
according to
classification info and ACLs
and convert classification
info to DSCP value
Classification: Classify traffic according to packet classification information and
generate internal DSCP value based on the classification information. For different
packet types and switch configurations, classification is performed differently; the
flowchart below explains this in detail.
Ingress
Generate
DSCP
Policing
Decide whether
the traffic is in profile or out
of profile according to
the packet DSCP value
and plicing policy
Fig 8-3 Basic QoS Model
Remark
the Forward in profile
packets,
degrade/discard
outprofile packets
220
egress
Queuing and
scheduling
Place packets into priority
queues according to CoS
value and service
according the queue