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146Dell PowerConnect 28xx Systems User Guide
Defining CoS Global Parameters
This section contains the following topics:
• Defining CoS Settings
• Defining QoS Interface Settings
• Defining Queue Settings
• Mapping CoS Values to Queues
• Mapping DSCP Values to Queues
Defining CoS Settings
Defining CoS Settings
Class of Service (CoS) global parameters are set from the CoS Settings page.
To open the CoS Settings
page, click Quality of Service CoS Global Parameters CoS Settings in
the tree view.
Figure 9-1. CoS Settings
•
Cos Mode
— Enables or disables managing network traffic using Quality of Service.
•
Trust Mode
— Determines which packet fields to use for classifying packets entering the device.
When no rules are defined, the traffic containing the predefined packet field (CoS or DSCP) is
mapped according to the relevant trust modes table. Traffic not containing a predefined packet field is
mapped to best effort. The possible Trust mode field values are:
–
CoS
(802.1P)
— The output queue assignment is determined by the IEEE802.1p VLAN priority
tag (VPT) or by the default VPT assigned to a port.
–
DSCP
— The output queue assignment is determined by the DSCP field.
Enabling Quality of Service: