Diffserv Configuration - NETGEAR XS728T ProSAFE Software Administration Manual

Packet processing begins by checking the class match criteria for a packet. A policy is
applied to a packet when a class match within that policy is found.
From the DiffServ menu under the QoS tab, you can access the following:
•

Diffserv Configuration

• DSCP Violate Action Mapping
• Class Configuration
• IPv6 Class Configuration
• Policy Configuration
• Service Configuration
• Service Statistics
Diffserv Configuration
Use the Diffserv Configuration screen to display DiffServ general status group information,
which includes the current administrative mode setting as well as the number of used
resources for DiffServ.
To view DiffServ general status group information:

Select QoS > DiffServ > Basic > Diffserv Configuration.
The following information is displayed:
• The Admin Mode for DiffServ is always Enabled.
• The DiffServ Used Resources field displays the number of entries used by DiffServ.
DSCP Violate Action Mapping
When a policer is assigned to a class map (flows), use the DSCP Violate Action Mapping
screen to specify the action to take when the amount of traffic in the flows exceeds the
QoS-specified limits. The portion of the traffic that causes the flow to exceed its QoS limit is
referred to as violate action packets.
When this action occurs, the switch remaps the original DSCP value of the violate action IP
packets with a new value based on the DSCP Violate Action Mapping table. The switch uses
the new values to assign resources and the egress queues to these packets. The switch also
physically replaces the original DSCP value in the violate action packets with the new DSCP
value.
This feature changes (remarks) the DSCP tags for incoming traffic switched between trusted
QoS domains.
For example, assume that there are three levels of service—A, B, and C— and the DSCP
incoming values used to mark these levels are 10, 20, and 30 respectively. If this traffic is
forwarded to another service provider that has the same three levels of service, but uses
DSCP values 16, 24, and 48, the DSCP violate action mapping changes the incoming values
as they are mapped to the outgoing values.
XS728T ProSAFE 28-Port 10-Gigabit L2+ Smart Switch
Quality of Service
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