PLANET ISW-504PS - Manual (Page 66)

User’s Manual
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
Address
VLAN TAG
(Optional)
Ethernet Type
(0800)
Data FCS
6 bytes 6 bytes 4 bytes 2 bytes 2 bytes 46-1517 bytes 4 bytes
Figure 4-42 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 RFC-2474. Select the QoS mode to IP DSCP, the DSCP to priority mapping page appears, as the
Figure 4-43 shows.
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