Comnet CWFE8TX8MS Installation And Operation Manual page 77

This feature is useful for accommodating devices that you want to participate in
the VLAN but that do not support tagging. Only one untagged VLAN is allowed per
port.
Ingress Filtering
Ingress filtering lets frames belonging to a specific VLAN to be forwarded if the
port belongs to that VLAN. The CWFE8TX8MS has two ingress filtering rules as
follows:
Ingress Filtering Rule 1: Forward only packets with VID matching this port's
configured VID.
Ingress Filtering Rule 2: Drop Untagged Frame.
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