Dell PowerConnect 5548P System User's Manual page 473

FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Maintenance Projects\Dell
Contax\CxUGSwitching_VLAN.fm
Acceptable Frame Type
The acceptable frame type can be set on a port to accept all frames (tagged
and untagged), tagged only, or untagged only. This setting takes precedence
over all other settings, so that if the acceptable frame type is tagged only,
incoming untagged frames are silently discarded, even if the port has a valid
PVID.
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Dell PowerConnect 55xx Systems User Guide