D-Link DES-3250TG User Manual page 80

802.1p Default Priority
The switch allows the assignment of a default 802.1p priority to each port on the switch.
Click 802.1p default_priority in the QoS folder on the Configuration menu:
D-Link DES-3250TG Standalone Layer 2 Switch
Threshold <128>
threshold set above.
This is the value in units of packets
per second, beyond
ingress port for that block discards
packets. Each port contains three
counters, one each for Broadcast,
Multicast, and Destination Lookup
Fail packets. The
cleared every second. If the counter
for a particular
exceeds this threshold within one
second, then further packets of that
type will be dropped.
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which the
counters are
type of packet