Defining CoS Global Parameters

Class of Service (CoS) global parameters are set from the CoS Settings page.

To open the CoS Settings page, click Quality of ServiceCoS 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. Interface Trust settings override the global Trust mode setting.

Enabling Quality of Service:

1Open the CoS Settings page.

2Select Enable in the CoS Mode field.

3Click Apply Changes.

Class of Service is enabled on the device.

Selecting Trust:

1Open the CoS Settings page.

2Select Trust in the Trust Mode field.

3Click Apply Changes.

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Dell 28XX manual Defining CoS Global Parameters, Enabling Quality of Service, Selecting Trust, 149