TRENDnet TPE-1620WS User's Guide - Page 46

QoS (Quality of Service), Set CoS priority settings, Bridge, Apply, Traffic Class, CoS Table, Enabled

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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. Set CoS priority settings Bridge > QoS > CoS 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 "Access your switch management page" on page 11). 2. Click on Bridge, click on QoS and click on CoS. 3. Review the settings. Click Apply to save the settings. • For each Traffic Class whose queue you want to change, click on the CoS Table (Low, Medium, High, or Highest) radio button that applies to your configuration. • After you have completed this mapping process, select Enabled in the QoS Status field. © Copyright 2013 TRENDnet. All Rights Reserved. TPE-1620WS 4. Click Save Settings to Flash (menu). 5. Click Save Settings to Flash (button), then click OK. Note: This step saves all configuration changes to the NV-RAM to ensure that if the switch is rebooted or power cycled, the configuration changes will still be applied. 46

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© Copyright 2013 TRENDnet. All Rights Reserved.
TRENDnet User’s Guide
TPE-1620WS
46
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.
Set CoS priority settings
Bridge > QoS > CoS
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 “
Access your switch management page
”
on page 11).
2. Click on
Bridge
, click on
QoS
and click on
CoS
.
3.
Review the settings. Click
Apply
to save the settings.
•
For each
Traffic Class
whose queue you want to change, click on the
CoS Table
(Low, Medium, High, or Highest) radio button that applies to your
configuration.
•
After you have completed this mapping process, select
Enabled
in the
QoS
Status
field.
4. Click
Save Settings to Flash (menu)
.
5. Click
Save Settings to Flash (button)
, then click
OK.
Note:
This step saves all configuration changes to the NV-RAM to ensure that if the
switch is rebooted or power cycled, the configuration changes will still be applied.