Configuring Quality of Service
Configuring QoS - General
Cisco Small Business 200 Series Smart Switch Administration Guide 278
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Queue 1 has the lowest priority, queue 4 has the highest priority.
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 is displayed.
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.
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 Running
Configuration file 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
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