Hello Damka,
a) in Cisco devices you cannot redistribute a default static route into OSPF
under ospf process use
router ospf 10
default-information originate
The command above checks the IP routing table and generate an LSA type 5 for network 0.0.0.0/0 if a default route is present in the IP routing table ( a static default route , a BGP route and so on)
B) in Cisco OSPF redistribution requires the subnets keyword to perform correct redistribution otherwise OSPF will summarize to major network ( Class A, Class B, Class C)
so you need the following
router ospf 10
redistribute static subnets
Note: even if using a route-map to select what static route should be redistributed into OSPF you still need to provide the subnets parameter. This is OSPF specific.
so alternate command is
redistribute static subnets route-map STATIC-INTO-OSPF
ip prefix-list SELECTED 10.0.0.0/8 ge 16 le 24
route-map STATIC-INTO-OSPF permit 10
match address prefix SELECTED
edit:
c) OSPF requires that the static route next-hop is advertised with an internal OSPF route.
OSPF checks the static route next-hop.
It does not allow injection of a static route if the next-hop is part of another external route.
it does not allow for recursion between external routes.
This can happen when using both
redistribute connected subnets
redistribute static subnets
To avoid this:
under router ospf 10 use network statement for IP subnet of the static route IP next-hop
router ospf 10
! example: change according to your needs
network 10.10.10.0 0.0.0.255 area 0
You can eventually use a passive interface.
Hope to help
Giuseppe
