Cisco 300 Series - Mapping Dscp to Queue

Quality of Service
Configuring QoS - General
497 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
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Mapping DSCP to Queue
The DSCP (IP Differentiated Services Code Point) to Queue page maps DSCP
values 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.
The DSCP to Queue mapping is applicable to IP packets if:
• The device is in QoS Basic mode and DSCP is the trusted mode, or
• The device is in QoS Advanced mode and the packets belongs to flows that
is DSCP trusted
Non-IP packets are always classified to the best-effort queue.