I
er limit a
ch queue, and the packets in a queue
a
z
aller than
imit, no packet is dropped;
z
th exceeds the upper limit
wly received packets are dropped;
z
en the lower limit
the newly received packets
er the queue, the
ceived packets may be
a maximum drop probability
I
are generated to dete
packets to be dropped. As the dropping
p
ence, packets with
cedence are more likely to be dropped.
W
al TCP session synchronization
s other TCP sessions to be free of a TCP
s
of its packets being
n this way, TCP sessions can operate in
different rates in any case and the link bandwidth can be fully utilized.
Traffic mirroring
Traffic mirroring identifies traffic using ACLs and duplicates the matched packets to the destination
t port mirroring, refer to the
l.
QoS
o
n WRED algorithm, an upper limit and a low
re processed as follows.
re set for ea
When the current queue length is sm
the lower l
When the queue leng
, all the ne
When the queue length is betwe
are dropped at random. The long
and the upper limit,
more likely the newly re
dropped. However,
exists.
n WRED, random numbers
rmine the
olicy is determined by IP preced
lower pre
RED prevents glob
. It enable
ession slowed down because
dropped. I
mirroring port or CPU depending on your configuration. For information abou
Mirroring
module of this manua
C nfiguration
Complete the following tasks to configure QoS:
Remarks
Task
Configuring Priority Trust Mode
Optional
Configuring the Mapping between 802.1p
Priority and
cedence
Optional
Local Pre
Setting the Priority of Protocol Packets
Optional
Marking Packet Priority
Optional
Configuring Traffic Policing
Optional
Configuring Line Rate
Optional
Optional
Configuring VLAN Mapping
Optional
Configuring Queue Scheduling
Configuring WRED
Optional
Configuring Traffic Mirroring
Optional
Configuring Priority
Refer to section
Priority Trust Mode
Trust Mode
for introduction to priority trust m
Configuration prerequisites
The priority trust mode to be adopted has been determined.
The port where priority trust mode is to be configured has been determined.
z
The port priority value has been determined.
ode.
z
z
45-13
