Dell PowerConnect 2848 User's Guide - Page 149

Defining CoS Global Parameters, CoS Settings, Quality of Service, Cos Mode, Trust Mode, Enable, Trust

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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 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. Interface Trust settings override the global Trust mode setting. Enabling Quality of Service: 1 Open the CoS Settings page. 2 Select Enable in the CoS Mode field. 3 Click Apply Changes. Class of Service is enabled on the device. Selecting Trust: 1 Open the CoS Settings page. 2 Select Trust in the Trust Mode field. 3 Click Apply Changes. Update with your book title 149

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Update with your book title
149
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 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. Interface Trust settings
override the global Trust mode setting.
Enabling Quality of Service:
1
Open the
CoS Settings
page
.
2
Select
Enable
in the
CoS Mode
field.
3
Click Apply Changes.
Class of Service is enabled on the device.
Selecting Trust:
1
Open the
CoS Settings
page
.
2
Select
Trust
in the
Trust Mode
field.
3
Click Apply Changes.