bgp question

What does the “Default originate” checkbox do in winbox? I see nothing for it in the CLI.

I am looking to have MT “b” running BGP receive a default route from it’s peer “a”. What BGP option does that in MT?
Is it setup in the A router’s peer “b” settings or the b routers peer “a” settings?

Thanks!

Default originate is available when routing-test package is installed.

/routing bgp peer set default-originate=

Available values:
always - advertise default route even if there is no default route in routing table
if-installed - advertise default route only if it is installed in routing table
never - do not advertise default route

if i use default-originate=always or if-installed, do i need to filter (to give out only 0.0.0.0/0)on BGP out to the peer?