OSPF NSSA

[Human374]

Hi All,

I have the following topology:

This is the routing table of R5:

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
O        10.1.4.0/24 [110/2] via 10.4.5.4, 01:21:59, FastEthernet0/1
C        10.4.5.0/24 is directly connected, FastEthernet0/1
L        10.4.5.5/32 is directly connected, FastEthernet0/1
C        10.5.7.0/24 is directly connected, FastEthernet0/0
L        10.5.7.5/32 is directly connected, FastEthernet0/0
      30.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O        30.0.4.0/24 [110/2] via 10.4.5.4, 01:21:59, FastEthernet0/1
C        30.0.5.0/24 is directly connected, Loopback1
L        30.0.5.1/32 is directly connected, Loopback1
      40.0.0.0/24 is subnetted, 1 subnets
R        40.0.0.0 [120/1] via 10.5.7.7, 00:00:09, FastEthernet0/0

and the OSPF databe:

            OSPF Router with ID (5.5.5.5) (Process ID 1)

                Router Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         915         0x80000012 0x00836A 1
4.4.4.4         4.4.4.4         748         0x80000018 0x00581B 3
5.5.5.5         5.5.5.5         1020        0x80000018 0x009BEB 2

                Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
10.4.5.5        5.5.5.5         1020        0x8000000B 0x00F1E7

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
10.1.0.0        1.1.1.1         915         0x80000004 0x00869D
20.0.1.0        1.1.1.1         915         0x80000004 0x000515
20.0.2.0        1.1.1.1         915         0x80000004 0x000414
20.0.3.0        1.1.1.1         915         0x80000004 0x00F81E

                Type-7 AS External Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Tag
10.5.7.0        5.5.5.5         1020        0x80000003 0x0047FE 0
40.0.0.0        5.5.5.5         1020        0x80000003 0x0049EA 0

Configuration of R1:

router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 area 1 nssa
 network 10.1.0.0 0.0.0.255 area 0
 network 10.1.4.0 0.0.0.255 area 1
 network 20.0.1.0 0.0.0.255 area 0
interface Loopback1
 ip address 20.0.1.1 255.255.255.0
 ip ospf network point-to-point

There is only one thing I do not understand. Why do not send the ABR router (R1) default route into Area 1?

The EIGRP network is not reachable from Area 1, since there is no default route advertised by ABR nor Type 5/7 LSAs.

The RIP network is reachable from Area 0 and 1 as it should be.

[Jon Marshall · Accepted solution]

Add this to R1 - 

"area 1 nssa default-information orginate" 

Jon

[Human374]

ah, I didn't notice that command

Thank you!