Class Of Service; Trust Mode; Port Priority - TP-Link T3700G-28TQ User Manual

12.1 Class of Service

The Class of Service (CoS) queueing feature allows you configure certain aspects of switch
queueing. It provides the desired QoS behavior for different types of network traffic when the
complexities of DiffServ are not required. This switch classifies the ingress packets, maps the
packets to different priority queues and then forwards the packets according to specified
scheduling algorithms. The switch implements three priority modes based on port, on 802.1P
and on DSCP, and supports three queue scheduling algorithms.
The Class of Service function can be implemented on Trust Mode, Port Priority, 802.1P/CoS
to Queue Mapping, DSCP to Queue Mapping and Schedule Mode pages.

12.1.1 Trust Mode

On this page you can configure the trust mode. The switch can be configured to trust one of
the packet fields (802.1p or IP DSCP), or to not trust any packet's priority designation
(untrusted mode).
Choose the menu QoS→Class of Service→Trust Mode to load the following page.
Configuration Procedure:
Configure the trust mode according to your needs, then click Apply.
Entry Description:
Trust Mode:

12.1.2 Port Priority

On this page you can configure the port priority.
Choose the menu QoS→Class of Service→Port Priority to load the following page.
Figure 12-6 Port Priority Config
Configure the trust mode.
untrusted: untrusted mode. In this mode, data will be classified into
different service based on the port priority and the 802.1p/CoS
mapping.
trust 802.1p: trust 802.1p mode. In this mode, data will be classified
into different service based on the 802.1p priority and the
802.1P/CoS mapping.
trust ip-dscp: trust ip-dscp mode. In this mode, data will be
classified into different service based on the DSCP priority and the
DSCP-mapping.
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