This item defines the VLAN operation mode of the port: perPortOnly(1) - indicates that all received packets are mapped to the VLAN, defined on the port, and packets are transmitted in untagged format; dot1QTagging(2) - indicates that all received packets are mapped to VLANs according to 802.1Q standard. All transmitted packets are tagged according to the standard 802.1Q tagging; plusTagging(3) - indicates that all packets recieved and transmitted on that port are tagged according to Lannet_s PlusTagging scheme. This mode is used when inter-VLAN bridging should be supported; islTagging(4) - indicates that all packets recieved and transmitted on that port are tagged according to the proprietary ISL mode of Lannet; dot1QTaggingButPVID(5) - indicates that all received packets are mapped to VLANs according to 802.1Q standard. All transmitted packets are tagged according to the standard 802.1Q tagging, exluding packets that belong to the port_s VLAN,which are transmitted untagged.