System information

Configuring Quality of Service
Configuring QoS
Cisco Small Business 200 Series Smart Switch Administration Guide 190
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To map CoS values to egress queues:
STEP 1 Click Quality of Service > General > CoS/802.1p to Queue. The CoS/802.1p to
Queue Page
opens.
STEP 2 Enter the parameters.
• 802.1p—Displays the 802.1p priority tag values to be assigned to an egress
queue, where 0 is the lowest and 7 is the highest priority.
• Output Queue—Select the egress queue to which the 802.1p priority is
mapped. Four egress queues are supported, where Queue 4 is the highest
priority egress queue and Queue1 is the lowest priority.
• Restore Defaults—Click to restore all queues to the factory default CoS/
802.1pto Queue mapping.
STEP 3 For each 802.1p priority select the Output Queue to which it is mapped.
STEP 4 Click Apply. 801.1p priority values to queues are mapped, and the switch is
updated.
Mapping DSCP to Queue
The DSCP (IP Differentiated Services Code Point) to Queue Page maps DSCP to
egress queues. The DSCP to Queue Table determines the egress queues of the
incoming IP packets based on their DSCP values. The original VPT (VLAN Priority
Tag) of the packet is unchanged.
By simply changing the DSCP to Queue mapping and the Queue schedule method
and bandwidth allocation, it is possible to achieve the desired quality of services in
a network.
DSCP to Queue mapping is applicable to IP packets if DSCP is the trusted mode.
Non-IP packets are always classified to the best-effort queue.