tmnxOspfNgIfAdvtSubnet 1.3.6.1.4.1.6527.3.1.2.36.31.1.17

The value of tmnxOspfNgIfAdvtSubnet specifies the advertisement method. When tmnxOspfNgIfAdvtSubnet is set to 'true', OSPF will advertise the network number and netmask instead of the individual host-routes of an active point-to-point interface.