Mapping Dscp To Queue - Cisco SF500-24 Administration Manual

Configuring Quality of Service
Configuring QoS - General
STEP 3
STEP 4
STEP 1
STEP 2
STEP 3
Cisco 500 Series Stackable Managed Switch Administration Guide
• Output Queue—Select the egress queue to which the 802. 1 p priority is
mapped. Four egress queues are supported, where Queue 4 is the highest
priority egress queue and Queue1 is the lowest priority.
For each 802. 1 p priority, select the Output Queue to which it is mapped.
Click Apply. 801. 1 p 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.
The DSCP to Queue mapping is applicable to IP packets if:
• The switch is in QoS Basic mode and DSCP is the trusted mode, or
• The switch 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
To map DSCP to queues:
Click Quality of Service > General > DSCP to Queue. The DSCP to Queue page
is displayed.
The DSCP to Queue page contains Ingress DSCP. It displays the DSCP value in
the incoming packet and its associated class.
Select the Output Queue (traffic forwarding queue) to which the DSCP value is
mapped.
Click Apply. The Running Configuration file is updated.
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