OSPF redistribute static (blackhole) routes

[eyeV]

Hi everybody.
I have Summit x480 with connected subnet 172.30.0.0/16. But I'd like to advertise to OSPF process another subnets like 172.30.20.0/24, 172.30.21.0/24 and so forth.

I try to create routes via Null0 and export these to OSPF, but I find only "blackhole" routes.

Can I export blackhole routes to OSPF? Can anybody suggest me another way to advertise /24 subnets.

[eyeV]

Thank you, but...

I have Vlan Default with IP address 172.30.0.254/16 and I can't assign IP address 172.30.20.1/24 to my loopback VLAN. It's overlaps.

I only want to advertise /24 subnets.

[Sumit_Tokle]

Create the loopback interface.
Assign the IP address to the loopback interface.
Advertise the loopback vlan into OSPF.