PLANET SGSD-1022 - Manual (Page 238)

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
4.10.2 Layer 3/4 Priority Settings
4.10.2.1 Mapping Layer 3/4 Priorities to CoS Values
This Managed Switch supports several common methods of prioritizing layer 3/4 traffic to meet application requirements. Traffic
priorities can be specified in the IP header of a frame, using the priority bits in the Type of Service (TOS) octet or the number of
the TCP port. If the priority bits are used, the TOS octet may contain three bits for IP Precedence, four bits for IP TOS (see page
3-227), or six bits for Differentiated Services Code Point (DSCP) service. When these services are enabled, the priorities are
mapped to a Class of Service output queue.
Because different priority information may be contained in the traffic, the Managed Switch maps priority values to the output
queues in the following manner – The precedence for priority mapping is IP Port Priority, IP Precedence/DSCP/ToS Priority, and
then Default Port Priority.
4.10.2.2 IP DSCP Priority Status
Figure 4-10-5 IP DSCP Priority Status page screenshot
The page includes the following fields:
Object Description
IP DSCP Priority Status Enables or disables IP DSCP priority.
IP DSCP priority settings apply to all interfaces.
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