This value specifies the endpoint type a MEP implements: default(0) for a traditional MEP, facilityPort(1) for a facility port/LAG-level MEP, facilityInterface(2) for a router-interface-level MEP, or sapPrimaryVlan(3) to use the primary VLAN ID from the MA Comp table (only valid if that primary VLAN ID is nonzero); it must be specified at row creation. An admin selects the type based on what the MEP is meant to monitor: an ordinary service access point, an underlying facility, or a VLAN derived from the maintenance association's configuration. Choosing the wrong type at creation typically means deleting and recreating the MEP, since this object can't be changed afterward.