Qos Basic Mode - Dell PowerConnect 5524P User Manual

QoS Basic Mode

This section describes QoS Basic mode.
It contains the following topics:
• Basic Mode Overview
• Workflow to Configure Basic Mode
• Global Settings
• DSCP Rewrite
• Interface Settings
Basic Mode Overview
In QoS Basic mode, a specific domain in the network can be defined as
trusted. Within that domain, packets are marked with CoS priority and/or
DSCP values, to signal the type of service they require. Nodes within the
domain use these fields to assign the packet to a specific output queue. The
initial packet classification and marking of these fields is done in the ingress
of the trusted domain.
Workflow to Configure Basic Mode
To configure Basic QoS mode, perform the following:
1 Select Basic mode for the system in the QoS Mode page
2 Select the trust-behavior in the Global Settings page.
3 If there is any port that, as an exception, should not trust the incoming
CoS mark, disable the QoS state on that port in the Interface Settings
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pages
If a port is disabled without trusted mode, all its ingress packets are
forwarded in best effort. It is recommended that you disable the trusted
mode at the ports where the CoS and/or DSCP values in the incoming
packets are not trustworthy. Otherwise, performance in the network might
be negatively affected.
4 If you selected DSCP Rewrite in the Global Settings page, set the DSCP
in/out values in the DSCP Rewrite page.
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