For each bridge component, the Default MD Level Managed Object controls MHF creation for VIDs that are not attached to a specific Maintenance Association Managed Object, and Sender ID TLV transmission by those MHFs. For each Bridge Port, and for each VLAN ID/ISID whose data can pass through that Bridge Port, an entry in this table is used by the algorithm in subclause 22.2.3 only if there is no entry in the Maintenance Association table defining an MA for the same VLAN ID/ISID and MD Level as this table's entry, and on which MA an Up MEP is defined. If there exists such an MA, that MA's objects are used by the algorithm in subclause 22.2.3 in place of this table entry's objects. The agent maintains the value of fsMIEcfmExtDefaultMdStatus to indicate whether this entry is overridden by an MA. When first initialized, the agent creates this table automatically with entries for all VLAN ID/ISID, with the default values specified for each object. After this initialization, the writable objects in this table need to be persistent upon reboot or restart of a device.