Layer 3/4 Priority Settings; Mapping Layer 3/4 Priorities To Cos Values; Enabling Ip Dscp Priority; Figure 3-116 Ip Dscp Priority Status - Digisol DG-FS4526 Management Manual

3
Configuring the Switch

Layer 3/4 Priority Settings

Mapping Layer 3/4 Priorities to CoS Values

This 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 3-192), 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 switch
maps priority values to the output queues in the following manner:
• The precedence for priority mapping is IP Port, IP Precedence/DSCP/ToS, then
default switchport priority.
• IP Precedence, IP DSCP, and IP TOS Priority cannot all be enabled at the same
time. Enabling one of these priority types automatically disables the others.

Enabling IP DSCP Priority

The switch allows you to enable or disable the IP DSCP priority.
Command Attributes
• IP DSCP Priority Status – The following options are:
- Disabled – Disables the priority service. (Default Setting: Disabled)
- IP DSCP – Maps layer 3/4 priorities using Differentiated Services Code Point
Mapping.
Web – Click Priority, IP DSCP Priority Status. Select IP DSCP from the drop down
menu, then click Apply.
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Figure 3-116 IP DSCP Priority Status

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