Cisco 350 Series Administration Manual page 654

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In QoS Advanced Mode, when the Default Mode Status is set to Not Trusted, the default CoS
values configured on the interface is ignored and all the traffic goes to queue 1. See the Quality
of Service > QoS Advanced Mode > Global Settings page for details.
If you have a policy on an interface then the Default Mode is irrelevant, the action is according
to the policy configuration and unmatched traffic is dropped.
Select Override Ingress DSCP to override the original DSCP values in the incoming packets
with the new values according to the DSCP Override Table. When Override Ingress DSCP is
enabled, the device uses the new DSCP values for egress queuing. It also replaces the original
DSCP values in the packets with the new DSCP values.
The frame is mapped to an egress queue using the new, rewritten value, and not
NOTE
by the original DSCP value.
If Override Ingress DSCP was enabled, click DSCP Override Table to reconfigure DSCP.
DSCP Override Table
Enter the following fields:
• DSCP In—Displays the DSCP value of the incoming packet that needs to be remarked
to an alternative value.
• DSCP Out—Select the DSCP Out value to indicate the outgoing value is mapped.
Click Apply.
Out-of-Profile DSCP Remarking
When a policer is assigned to a class maps (flows), you can specify the action to take when the
amount of traffic in the flow(s) exceeds the QoS-specified limits. The portion of the traffic that
causes the flow to exceed its QoS limit is referred to as out-of-profile packets.
If the exceed/violate action is Out of Profile DSCP, the device remaps the original DSCP value
of the out-of-profile IP packets with a new value based on the Out of Profile DSCP Remarking
Table. The device uses the new values to assign resources and the egress queues to these
packets. The device also physically replaces the original DSCP value in the out of profile
packets with the new DSCP value.
To use the out-of-profile DSCP exceed action, remap the DSCP value in the Out Of Profile
DSCP Remarking Table. Otherwise the action is null, because the DSCP value in the table
remaps the packets to itself by factory default.
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
Quality of Service
QoS Advanced Mode