
User’s Manual of LRP-822CS/LRP-1622CS
193
4.8 Quality of Service
4.8.1 Understand QoS
advance
re that allows you to establish control over network traffic. QoS
es o
f traffic, such as multi-media, video, protocol-specific,
-backup traffic.
QoS reduces bandwidth limitations, delay, loss, and jitter. It also provides increased reliability for delivery of your data and
allows you to prioritize certain applicati
ross your net
u want the switch to treat
selected applications and types of traffic.
ou can use QoS on your system to:
Control a wide variety of network traffic by:
Classifying traffic based on packet attributes.
Assigning priorities to traffic (for example, to set higher priorities to time-critical or business-critical applications).
Applying security policy through traffic filtering.
Provide predictable throughput for multimedia applications such as video conferencing or voice over IP by minimizing
delay and jitter.
Improve performance for specific types of traffic and preserve performance as the amount of traffic grows.
Reduce the need to constantly add bandwidth to the network.
Manage network congestion.
To implement QoS on your network, you need to carry out the following actions:
1.
Define a service level to determine the priority that will be applied to traffic.
2.
Apply a classifier to determine how the incoming traffic will be classified and thus treated by the Switch.
3.
Create a QoS profile which associates a service level and a classifier.
4.
Apply a QoS profile to a port(s).
The
QoS
page of the LRP Managed Switch contains three types of QoS mode - the
802.1p
mode,
DSCP
mode or
Port-base
mode can be selected. Both the three mode rely on predefined fields within the packet to determine the output queue.
802.1p Tag Priority
Mode –The output queue assignment is determined by the IEEE 802.1p VLAN priority tag.
IP DSCP
Mode - The output queue assignment is determined by the TOS or DSCP field in the IP packets.
Port-Base Priority
Mode – Any packet received from the specify high priority port will treated as a high priority
packet.
The LRP Managed Switch supports
eight priority level
queue, the queue service rate is based on the
WRR
(
Weight Round
Robin
) and
WFQ (Weighted Fair Queuing)
alorithm. The WRR ratio of high-priority and low-priority can be set to “
4:1
and
8:1.
Quality of Service (QoS) is an
d traffic prioritization featu
enables you to assign various grad
f network service to different types o
time critical, and file
ons ac
work. You can define exactly how yo
Y
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