On a Nexus, use a route-map command with a collection clause of metric-type type-[½] so as to possess an equivalent practicality as in IOS exploitation the default-information originate forever metric-type [½] command.
For example :
switch(config)#route-map STAT-OSPF, permit, sequence ten
switch(config-route-map)#match interface local area network 1/2
switch(config-route-map)#set metric-type internal