Alloy Computer Products GSM-8T16SFP - Manual (Page 71)

GSM Series User Manual
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Rule 2:
Drop untagged frame. You can configure a given port to accept all frames tagged
and untagged or just to receive tagged frames. If the former is the case, then
packets that are tagged or untagged will be processed. If the later is the case,
only packets carrying VLAN tags will be processed, all other packets will be
dropped.
Role:
This is an Egress rule of the port. Here you can select the role of the port to be
Access, Trunk or Hybrid. Trunk means that all outgoing packets must carry a
VLAN tag header. Access means the outgoing packets carry no VLAN tag
header. If packets have double VLAN tags, one will be dropped and the other will
be used. Hybrid is similar to Trunk in which both of them will tag outgoing
packets. When the port is set to hybrid the outgoing packets will be untagged if
the VID matches the VID configured in the Untag VID section.
Untag VID:
Valid range is 0 – 4094. This will only work if the Role is set to Hybrid.
Fig. 3-41