User’s Manual of FSD-804PS
4.6.2 DSCP QoS Mode
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.
4
bit 4
bit
6
bit
2
bit
VER=0100 Header
Size
DiffServ
RES
Preamble
Destination
Address
Source Ad-
dress
VLAN TAG
(Optional)
Ethernet Type
(0800)
Data FCS
6 bytes
6 bytes
4 bytes
2 bytes
2 bytes
46-1517 bytes
4 bytes
Figure 4-38
IPv4 frame format
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 PoE Switch recognizes TCP/IP Differentiated Service Codepoint (DSCP) priority information from the
DS-field defined in RFC2474. Select the QoS mode to IP DSCP, the DSCP to priority mapping page appears, as the
Figure
4-39
shows.
Figure 4-39
DSCP QoS Configuration screen
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