injecting a default-route by an ASBR into OSPF domain and reaching the ABR

[Mehdi.a.majid1]

What I want to do here is to generate a default-route on BR4 ( Totally NSSA ) which till this part it is simple

by

BR4(config-router)#area 4 nssa default-information-originate metric-type 1

and advertisement of this default-route reaches the HQ ( ABR & ASBR ) but the HQ does not consider it,

how can I make the HQ to consider it , what are the ways to do that ?

I appreciate any help that I can get.

[Georg Pauwen]

Hello,

so the default route is in there. What is the output of 'show ip ospf database' and 'show ip route' on HQ router ?

[Mehdi.a.majid1]

Hello

HQ(config-if)#do show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/30 is directly connected, GigabitEthernet0/0
L        1.1.1.2/32 is directly connected, GigabitEthernet0/0
      2.0.0.0/30 is subnetted, 1 subnets
S        2.2.2.0 [1/0] via 1.1.1.1
      3.0.0.0/30 is subnetted, 1 subnets
S        3.3.3.0 [1/0] via 1.1.1.1
      4.0.0.0/30 is subnetted, 1 subnets
S        4.4.4.0 [1/0] via 1.1.1.1
      5.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O        5.0.0.4/30 is a summary, 00:00:41, Null0
O        5.0.0.5/32 [110/1001] via 10.4.4.4, 00:00:41, Tunnel4
      8.0.0.0/32 is subnetted, 2 subnets
O N2     8.8.4.4 [110/1] via 10.4.4.4, 00:00:41, Tunnel4
C        8.8.8.8 is directly connected, Loopback4
      9.0.0.0/32 is subnetted, 1 subnets
S        9.9.9.9 [1/0] via 44.44.44.2
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.4.4.0/24 is directly connected, Tunnel4
L        10.4.4.1/32 is directly connected, Tunnel4
      11.0.0.0/32 is subnetted, 1 subnets
C        11.11.11.11 is directly connected, Loopback1
      44.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        44.44.44.0/29 is directly connected, GigabitEthernet0/3
L        44.44.44.1/32 is directly connected, GigabitEthernet0/3
      172.16.0.0/16 is variably subnetted, 5 subnets, 3 masks
C        172.16.1.0/29 is directly connected, GigabitEthernet0/1
L        172.16.1.1/32 is directly connected, GigabitEthernet0/1
C        172.16.2.0/29 is directly connected, GigabitEthernet0/2
L        172.16.2.1/32 is directly connected, GigabitEthernet0/2
O        172.16.12.0/24 [110/2] via 172.16.2.2, 00:04:05, GigabitEthernet0/2
      192.168.40.0/25 is subnetted, 1 subnets
O        192.168.40.0 [110/1001] via 10.4.4.4, 00:00:41, Tunnel4
      192.168.123.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.123.0/28 is directly connected, Tunnel123
L        192.168.123.1/32 is directly connected, Tunnel123
HQ(config-if)#do show ip ospf database

            OSPF Router with ID (144.0.4.0) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
5.0.4.0         5.0.4.0         255         0x80000004 0x002A98 2
144.0.4.0       144.0.4.0       258         0x80000005 0x00E9D0 2

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
172.16.2.2      5.0.4.0         255         0x80000003 0x002AAD

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
5.0.0.4         144.0.4.0       49          0x80000001 0x001B9A
10.4.4.0        144.0.4.0       288         0x80000001 0x00ADFC
192.168.40.0    144.0.4.0       49          0x80000001 0x002E7B
192.168.123.0   144.0.4.0       288         0x80000001 0x0032B4

                Router Link States (Area 1)
          
Link ID         ADV Router      Age         Seq#       Checksum Link count
144.0.4.0       144.0.4.0       298         0x80000003 0x00DB67 1

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
5.0.0.4         144.0.4.0       49          0x80000001 0x001B9A
10.4.4.0        144.0.4.0       288         0x80000001 0x00ADFC
172.16.1.0      144.0.4.0       288         0x80000001 0x00A749
172.16.2.0      144.0.4.0       288         0x80000001 0x009C53
172.16.12.0     144.0.4.0       253         0x80000001 0x00627B
192.168.40.0    144.0.4.0       49          0x80000001 0x002E7B

                Router Link States (Area 4)

Link ID         ADV Router      Age         Seq#       Checksum Link count
44.0.4.0        44.0.4.0        55          0x80000007 0x00D69B 3
144.0.4.0       144.0.4.0       54          0x80000006 0x00D218 1

                Net Link States (Area 4)

Link ID         ADV Router      Age         Seq#       Checksum
10.4.4.1        144.0.4.0       54          0x80000001 0x005D6A

                Summary Net Link States (Area 4)

Link ID         ADV Router      Age         Seq#       Checksum
0.0.0.0         144.0.4.0       298         0x80000001 0x00B7BE

                Type-7 AS External Link States (Area 4)

Link ID         ADV Router      Age         Seq#       Checksum Tag
0.0.0.0         44.0.4.0        488         0x80000001 0x00E40B 0
0.0.0.0         144.0.4.0       298         0x80000001 0x00086A 0
8.8.4.4         44.0.4.0        488         0x80000001 0x009BD3 65001
8.8.8.8         44.0.4.0        563         0x80000001 0x00FD3A 4

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
8.8.4.4         144.0.4.0       48          0x80000001 0x00A86C 65001
HQ(config-if)#

Thanks.

[paul driver]

Hello

Can you give HQ an ospf router id a high value something like

222.222.222.222, Then clear the ospf process and test again please   

One other thing i have forgot to ask is how BR4 receiving it bgp default?
i assume its peer is advertising a default - is that by a bgp neighbour default originate command?

[Mehdi.a.majid1]

Hello,

I changed the HQ router-id to 222.222.222.222 but still the same situation.

and BR4 gets its default route through the ( neighbor default-originate ) BGP command at its bgp peer

Thanks.

[paul driver]

Hello

okay then I can only suggest at this time its gns related 

what version are you running and iOS software for the rtrs ?

[Mehdi.a.majid1]

Hello,

GNS3 2.1.8

Cisco IOS Software, IOSv Software (VIOS-ADVENTERPRISEK9-M), Version 15.6(2)T, RELEASE SOFTWARE (fc2)

Thanks.

[paul driver]

Hello

Possible then, I am using the same GNS3 version but i have dyanmips ios c3725-adventerprisek9-mz.124-15.T14.image, And it works just fine with your lab setup

Be interest to hear from @Georg Pauwen and what software he was using as he stated it didnt work on his lab either

[Georg Pauwen]

Hello,

I am using the exact same versions...

Can you post the output of 'show ip ospf int brief' from HQ router ?

[Mehdi.a.majid1]

Hello,

HQ#show ip ospf int brief
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Gi0/2        1     0               172.16.2.1/29      1     BDR   1/1
Gi0/1        1     0               172.16.1.1/29      1     BDR   1/1
Tu123        1     1               192.168.123.1/28   1000  DR    2/2
Tu4          1     4               10.4.4.1/24        1000  P2P   1/1
HQ#

BR4#show ip ospf int brief
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Lo5          1     4               5.0.0.5/32         1     LOOP  0/0
Gi0/2        1     4               192.168.40.1/25    1     DR    0/0
Tu4          1     4               10.4.4.4/24        1000  P2P   1/1
BR4#

[Georg Pauwen]

Hello,

try and set the cost of the tunnel to the lowest of all others, that is e.g.:

interface GigabitEthernet0/2

ip ospf cost 10

!

interface GigabitEthernet0/1 

ip ospf cost 10

!

interface Tunnel123

ip ospf cost 100

!
interface Tunnel4

ip ospf cost 9