Relationship Between Wred And Queuing Mechanisms; Wred Configuration Approaches; Wred Parameters - HP MSR4080 Configuration Manual

With WFQ queuing used, you can set the exponent for average queue size calculation, upper threshold,
lower threshold, and drop probability for packets with different precedence values respectively to
provide differentiated drop policies.
With FIFO queuing used, you can set the exponent for average queue size calculation, upper threshold,
lower threshold, and drop probab
classes of packets.
Rel ationship between WRED and queuing mechanisms
Figure 18 Relationship between WRED and queuing mechanisms
Packets to be sent
through this interface
Through combining W
own queue after cla
when a flow with a larger queu
flow with a smaller queue size ar protected.

WRED configuration approaches

You can configure WRED by using
• Interface configuration
WRED table configuration—Configure a WRED table in system view
•
table to an interface.
The router supports only the interf
WRED parame
Determine the following param
Upper threshold and lower threshold—When the average queue size is sm
•
threshold, packets are not dropped. When the average queue size is between the lower threshold
and the upper threshold, the packets are dro
ility for each queue to provide differentiated drop policies for different
Queue 1 weight 1
WRED drop
Queue 2 weight 2
......
Qu eue N-1 weight N-1
Classify
Queue N weight N
Packets
dropped
RED with WF Q, the flow-based WRED can be r
ssification, a flo w with
e size has a higher packet drop probability. In this way, the benefits of the
e
one of the following approaches:
—Conf igure WRED parameters on an
ace configuration approach.
ters
eters before configuring WRED:
......
Schedule
Sending queue
a smaller queue size has a lo
pped at random. The longer the queue, the higher the
63
Packets sent
Interface
ealiz ed. Because each flow
wer packe t drop probability,
interfac e and enable WRED.
and the n apply the WRED
aller than the lower
has its