Examine the two NSSA external LSAs, one for 90.0.0.0/8, matching the summary range configured, and the other for the default external route in the NSSA area.
Another external LSA is generated in the area 0.0.0.0 corresponding to the nssa-external LSA 90.0.0.0/8.
SEFOS# show ip ospf database nssa-external
OSPF Router with ID (10.4.0.2)
NSSA External Link States (Area 0.0.0.2)
----------------------------------------------
LS age : 300
Options : (No ToS Capability, DC)
LS Type : NSSA External Link
Link State ID : 90.0.0.0
Advertising Router : 10.2.2.9
LS Seq Number : 0x80000001
Checksum : 0xc84f
Length : 36
NSSA External Link States (Area 0.0.0.2)
----------------------------------------------
LS age : 300
Options : (No ToS Capability, DC)
LS Type : NSSA External Link
Link State ID : 0.0.0.0
Advertising Router : 10.4.0.2
LS Seq Number : 0x80000002
Checksum : 0x120
Length : 36
SEFOS# show ip ospf database external
OSPF Router with ID (10.4.0.2)
AS External Link States
-----------------------
LS age : 0
Options : (No ToS Capability, DC)
LS Type : AS External Link
Link State ID : 90.0.0.0
Advertising Router : 10.4.0.2
LS Seq Number : 0x80000001
Checksum : 0x49fd
Length : 36
Network Mask : 255.0.0.0
Metric Type : 0x80
Metric : 10
Forward Address : 10.2.2.9
Externel Route Tag : 0
SEFOS# show ip ospf route
OSPF Process Routing Table
Dest/Mask TOS NextHop/Interface Cost Rt.Type Area
--------- --- -------/--------- ---- ------- ----
10.2.2.0/255.255.255.0 0 0.0.0.0/vlan2 1 IntraArea 0.0.0.2
10.4.0.0/255.255.0.0 0 0.0.0.0/vlan1 1 IntraArea 0.0.0.0
90.0.0.0/255.0.0.0 0 10.2.2.9/vlan2 10 Type2Ext 0.0.0.2