Users Guide

Dell PowerConnect 55xx Systems User Guide 661
2 Enter the fields:
–
Trust Mode — Enable/disable Trust mode.
•
CoS — Traffic is mapped to queues, based on the VPT field in the
VLAN tag, or based on the per-port default CoS value (if there is
no VLAN tag on the incoming packet). The mapping of the VPT
to queue can be configured in the
CoS to Queue page.
•
DSCP — All IP traffic is mapped to queues, based on the DSCP
field in the IP header. The mapping of the DSCP to queue is
configured in the
DSCP to Queue page.
–
Always Rewrite DSCP — Check to always rewrite the DSCP values in
the incoming packets with the new values set in the
DSCP to Queue
page. When this field is enabled, the switch uses the new DSCP
values to select the egress queue.
Assigning Global Settings Using CLI Commands
The following table summarizes the CLI commands for configuring fields in
the
Global Settings page.
The following is an example of the CLI commands:
Table 22-8. Global Settings CLI Commands
CLI Command Description
qos trust {cos|dscp}
no qos trust
Configures the system to either the
CoS or DSCP trust state.
Use the no form of this command to
return to the default configuration.
qos dscp-mutation
no qos dscp-mutation
Applies the DSCP Mutation map to
system DSCP trusted ports.
Use the no form of this command to
restore the trusted port with no
DSCP mutation.
console(config)# qos trust dscp
console(config)# qos dscp-mutation