Quality of Service
QoS Advanced Mode
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x 368
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To map DSCP values:
STEP 1 Click Quality of Service > QoS Advanced Mode > Out of Profile DSCP Mapping. This
page enables setting the DSCP-value of traffic entering or leaving the device.
DSCP In displays the DSCP value of the incoming packet that needs to be re-marked to an
alternative value.
You may filter according to Action Type to display all Exceed or Violate. This enables you to
configure remarking when the traffic exceeds wither the Exceed or Violate threshold of a
policer.
STEP 2 Select the DSCP Out value to where the incoming value is mapped.
STEP 3 Click Apply. The Running Configuration file is updated with the new DSCP Mapping table.
STEP 4 Click Restore Defaults to restore the factory CoS default setting for this interface.
Class Mapping
A Class Map defines a traffic flow with ACLs (Access Control Lists) defined on it. A MAC
ACL, IP ACL, and IPv6 ACL can be combined into a class map. Class maps are configured to
match packet criteria on a match-all or match-any basis. They are matched to packets on a
first-fit basis, meaning that the action associated with the first-matched class map is the action
performed by the system. Packets that matches the same class map are considered to belong to
the same flow.
NOTE Defining class maps does not have any effect on QoS; it is an interim step, enabling the class
maps to be used later.
If more complex sets of rules are needed, several class maps can be grouped into a super-group
called a policy (see Policy Table).
NOTE In the same class map, a MAC ACL cannot be used with an IPv6 ACE that has a Destination
IPv6 address as a filtering condition.
The Class Mapping page shows the list of defined class maps and the ACLs comprising each,
and enables you to add/delete class maps.
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