Configuring Quality of Service
QoS Advanced Mode
Cisco Small Business 300 Series Managed Switch Administration Guide 268
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Policy Class Maps
One or more class maps can be added to a policy. A class map defines the type of
packets that are considered to belong to the same traffic flow.
NOTE You cannot configure a policer to a class map when the switch is operating in
Layer 3 mode. The switch supports policers only in Layer 2 mode.
To add a class map to a policy:
STEP 1 Click Quality of Service > QoS Advanced Mode > Policy Class Maps. The Policy
Class Maps Page opens.
STEP 2 Select a policy in the Filter, and click Go. All class maps in that policy are
displayed.
STEP 3 To add a new class map, click Add. The Add Policy Class Map Page opens.
STEP 4 Enter the parameters.
• Policy Name—Displays the policy to which the class map is being added.
• Class Map Name—Select an existing class map to be associated with the
policy. Class maps are created in the Class Mapping Page.
• Action Type—Select the action regarding the ingress CoS/802.1p and/or
DSCP value of all the matching packets.
- None—Ignore the ingress CoS/802.1p and/or DSCP value. The matching
packets are sent as best effort.
- Trust CoS/802.1p, DSCP—If this option is selected, the switch will trust
the CoS/802.1p and DSCP of the matching packet. If a packet is an IP
packet, the switch will put the packet in the egress queue based on its
DSCP value and the DSCP to Queue Table. Otherwise, the egress queue
of the packet is based on the packet's CoS/802.1p value and the CoS/
802.1p to Queue Table.
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