Allied Telesis AT-S63 - Manual (Page 452)

Chapter 19: Port-based and Tagged VLANs
452 Section III: VLANs
Protocol
The protocol associated with this VLAN. The possible settings are:
Blank - The VLAN is a port-based or tagged VLAN.
GARP - The VLAN is a dynamic GVRP VLAN or the port is a dynamic
GVRP port of a static VLAN.
Untagged (U) / Tagged (T)
The untagged and tagged ports that are part of the VLAN.