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28 Configuring and Monitoring the Switch DNswitch 800
Priority
IEEE 802.1p defines up to 8 separate traffic classes. This switch supports
Quality of Service (QoS) by using two priority queues, with weighted fair
queuing for each port. You can use the Priority menu to configure the
default priority for each port, or to display the mapping for the traffic
classes as described in the following sections.
Port Priority Configuration
The default priority for all ingress ports is zero. Therefore, any inbound
frames that do not have priority tags will be placed in the low priority
output queue. Default priority is only used to determine the output queue
for the current port; no priority tag is actually added to the frame. You can
use the Port Priority Configuration screen to adjust default priority for any
port as shown below:
Figure 3-20. Port Priority Configuration
Parameter Description
Port Numeric identifier for switch port.
Default Ingress
User Priority
Default priority can be set to any value from 0-7, where 0-3
specifies the low priority queue and 4-7 specifies the high
priority queue.
Number of Egress
Traffic Classes
Indicates that this switch supports two priority output queues.