SMC Networks TigerStack 100 1000BASE-X - Manual (Page 125)

P
RIORITY
3-31
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.
Port Priority Configuration
Inbound frames that do not have any VLAN tags are tagged with the input
port’s default VLAN ID (PVID) and the default ingress user priority as
shown in the following screen, and then sorted into the appropriate
priority queue at the output port. (Note that if the output port is an
untagged member of the associated VLAN, these frames are stripped of all
VLAN tags prior to transmission.)
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
queue of the output port. You can use the Port Priority Configuration
screen to adjust default priority for any port as shown below.