/* adds a VLAN to a port's VLAN membership table  */
IX_ETH_DB_PUBLIC IxEthDBStatus ixEthDBPortVlanMembershipAdd(IxEthDBPortId portID, IxEthDBVlanId vlanID)
/* adds a VLAN to a port's VLAN membership table  */
IX_ETH_DB_PUBLIC IxEthDBStatus ixEthDBPortVlanMembershipAdd(IxEthDBPortId portID, IxEthDBVlanId vlanID)
{
    IX_ETH_DB_CHECK_PORT(portID);
    IX_ETH_DB_CHECK_SINGLE_NPE(portID);
    IX_ETH_DB_CHECK_VLAN_ID(vlanID);
    IX_ETH_DB_CHECK_FEATURE(portID, IX_ETH_DB_VLAN_QOS);
    return ixEthDBPortVlanMembershipChange(portID, vlanID, ixEthDBPortInfo[portID].vlanMembership, ADD_VLAN);
}