VLAN table data Entry Format as follow: ====================== BYTE#: 5 4 3 2 1 0 Frame: [0:P10][P9:P8][P7:P6][P5:P4][P3:P2][P1:P0] Px: Port control Size: 4bits total Format: [PortState][PortMemberTag] PortState: The upper two bits of each port's VTU data is called 802.1s PortState. These bits are used to support 802.1s per VLAN spanning tree as follows: 00 - 802.1s Disabled. User non-VLAN Port states (in Port control 'portState') 01 - Blocking/Listening Port State for this port for frames with this VID 10 - Learning Port State for this port for frames with this VID 11 - Forwarding Port State for this port for frames with this VID NOTE: These 802.1s PortState bits take precedence over the port's 'portState' in port control unless the port's 'portState' is Disabled (which prevents all frames from flowing). MemberTag: Size: 2bits The lower two bits of each port's VTU data is called MemberTag. These bits are used to indicate which ports are members of the VLAN and if these VLANs frames should be tagged or untagged, or unmodified when exiting the port as follows: 00 - Port is a member of this VLAN and frames are to egress unmodified. 01 - Port is a member of this VLAN and frames are to egress Untagged. 10 - Port is a member of this VLAN and frames are to egress Tagged. 11 - Port is not a member of this VLAN