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STEP 5
STEP 6
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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 Mapping
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 Mapping
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 Mapping Table. Otherwise the action is null, because the DSCP value in the table
remaps the packets to itself by factory default.
This feature changes the DSCP tags for incoming traffic switched between trusted QoS
domains. Changing the DSCP values used in one domain, sets the priority of that type of
traffic to the DSCP value used in the other domain to identify the same type of traffic.
These settings are active when the system is in the QoS Advance mode, and once activated
they are active globally.
For example: Assume that there are three levels of service: Silver, Gold, and Platinum 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, Out of Profile DSCP Mapping changes the incoming values as
they are mapped to the outgoing values.
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
Quality of Service
QoS Advanced Mode
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