Now, VRP5.0 has a new command that can produce a default route in the BGP. Usually, in the BGP router cann't produce a default route in the default situation by itself; the default route just can be learned from its peer or use \network \ command to advertise .
This new command is \default-route imported\, which can produce a default route in the router. and it also can use in the VPN-instance family.
Suggested you can use this command instead of manual configuration .