Qos Processing Flow In A Device - H3C S5820X Series Configuration Manual

Congestion management provides a resource scheduling policy to determine the packet
forwarding sequence when congestion occurs. Congestion management usually applies to the
outgoing traffic of a port.
Congestion avoidance monitors the network resource usage and is usually applied to the outgoing
traffic of a port. When congestion worsens, congestion avoidance actively reduces the queue
length by dropping packets.

QoS Processing Flow in a Device

Figure 2-2 QoS processing flow
Classify the
Packets received
on the interface Classification
Packets to be
sent out the
interface
Tokens
Drop
traffic
CAR
Token bucket
Traffic policing
Enqueue
Queue 0
Dequeue
Queue 1
Queuing Queue 2
Queue N
Token bucket
Queues
Congestion
management
Other
proce
Remark
ssing
Priority marking
Tokens
Drop
Other
CAR
proces
GTS
sing
Congestion
Traffic policing
avoidance
Traffic shaping
2-3
Drop
Classify the
traffic
WRED
Transmit
Classification