Dell PowerConnect 8024 User Configuration Manual page 1149

mapping from the switch defaults to support lossless transport of frames on
CoS queue 4, with a 50% minimum bandwidth guarantee. Lossless traffic
classes generally use the default WRED queue discipline, as opposed to strict
priority, to avoid starving other traffic.
classofservice dot1p-mapping 4 4
cos-queue min-bandwidth 0 0 0 0 50 0 0
1149
Configuring Class-of-Service