OSPF NSSA ABR advertises default route
In an NSSA OSPF topology, the following command will generate a Type 7 default route:
router ospf 1 area 1 nssa default-information-originate
The following rules apply:
- When applied to an NSSA ASBR, this will only generate a default route if:
- there is a valid default route in the routing table that has been learned through a non-OSPF protocol.
- the keyword
alwaysis added at the end of the command.
- When applied to an NSSA ABR, this will generate a default route with or without a valid default route in the routing table.