User Manual

Chapter 5: Web-Based Management
GE-DSH-73/DSH-82 and DSH-82-PoE User Manual 109
TOS Configuration
DiffServ Code Point (DSCP) - is the traffic prioritization bits within an IP header that are
encoded by certain applications and/or devices to indicate the level of service
required by the packet across a network.
The Quality of Service page provides fields for defining output queue to specific DSCP
fields. When TCP/IP's TOS/DSCP mode is applied, the Switch recognizes TCP/IP
Differentiated Service Codepoint (DSCP) priority information from the DS-field defined
in RFC2474. Select the QoS mode to TOS, the TOS to priority mapping page appears,
as the Figure 5-53 shows.
Set up the TOS priority. With the drop-down selection item of Priority Type above
being selected as TOS only/TOS first, this control item will then be available to set the
queuing policy for each port.
Figure 5-53: QoS Configuration - TOS Priority
This page includes the following fields:
Object Description
TOS priority:
The system provides 0~63 TOS priority level. Each level has 4 types
of priority—High, Middle, Low, and Lowest. The default value is
‘Lowest’ priority for each level. When the IP packet is received, the
system will check the TOS level value in the IP packet that has
received. For example, the user sets the TOS level 25 as high, the
system will check the TOS value of the received IP packet. If the TOS
value of received IP packet is 25 (priority = high), and then the
packet priority will have highest priority.