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TRENDnet User's Guide
QoS (Quality of Service)
When a port on an Ethernet switch becomes oversubscribed, its egress
queues contain more packets than the port can handle in a timely manner. In this
situation, the port may be forced to delay the transmission of some packets, resulting in
the delay of packets reaching their destinations. A port may be forced to delay
transmission of packets while it handles other traffic, and, in some situations, some
packets destined to be forwarded to an oversubscribed port from other switch ports
may be discarded.
Minor delays are often of no consequence to a network or its performance. But there
are applications, referred to as delay or time sensitive applications, which can be
impacted by packet delays. Voice transmission and video conferences are two examples.
If packets carrying data in either of these cases are delayed from reaching their
destination, the audio or video quality may suffer.
This is where Cost of Service (CoS) is of value. It allows you to manage the flow of traffic
through a switch by having the switch ports give higher priority to some packets, such as
delay sensitive traffic, over other packets. This is referred to as prioritizing traffic.
Global Settings
Set QoS settings
1. Log into your switch management page (see
on page 9).
2. Click on QoS and click on Global Settings.
3. Select Enabled to enable QoS and Disabled to disable this feature.
4. Set the scheduling method:
Strict Priority - The port transmits all packets out of higher priority queues
•
before transmitting any from the lower priority queues.
WRR (Weighted RoundRobin) - The port transmits a set number of packets
•
from each queue, in a round robin fashion, so that each has a chance to
transmit traffic.
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"Access your switch management
page"
4. Select the Trust Mode:
•
DSCP – Priority of packets is based on the ToS (Types of Service) field in the IP
header
802.1p – Priority of packets is based off of the PRI value.
•
•
802.1p – DSCP -
CoS
Set CoS priority settings
QoS > CoS Mapping
Note: Before mapping the CoS priorities and the egress queues, you must disable the
Jumbo frame parameter on each port. When Jumbo frames are enabled, COS cannot be
enabled.
1. Log into your switch management page (see
on page 9).
2. Click on QoS and click on CoS Mapping.
3. In QoS Status, select the CoS Table (0-7) that applies to your configuration and click
Edit.
4. Set each Queue ID (1-8) for the selected CoS Table. Click Apply to save the settings.
TL2-F7120
"Access your switch management
page"
53
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