Monday, February 5, 2018

OSPF - Totally Not-So-Stubby Area (NSSA)

This is the last post in the series which presents totally NSSA option of OSPF implementation. R8 and R9 can't see prefixes from area 0, only default gateway.



R6#sh ip route

      10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C        10.0.0.0/24 is directly connected, FastEthernet0/0
L        10.0.0.6/32 is directly connected, FastEthernet0/0
O IA     10.1.0.0/24 [110/2] via 10.0.0.7, 00:44:36, FastEthernet0/0
O IA     10.2.0.0/24 [110/3] via 10.0.0.7, 00:17:59, FastEthernet0/0
C        10.10.10.0/24 is directly connected, Loopback0
L        10.10.10.6/32 is directly connected, Loopback0
      172.16.0.0/24 is subnetted, 2 subnets
O E2     172.16.3.0 [110/200] via 10.0.0.7, 00:17:58, FastEthernet0/0
O E2     172.16.4.0 [110/200] via 10.0.0.7, 00:17:58, FastEthernet0/0
R6#sh ip ospf database database-summary

            OSPF Router with ID (10.10.10.6) (Process ID 10)

Area 0 database summary
  LSA Type      Count    Delete   Maxage
  Router        2        0        0
  Network       1        0        0
  Summary Net   2        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    0        0        0
    Prefixes redistributed in Type-7  0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Subtotal      5        0        0

Process 10 database summary
  LSA Type      Count    Delete   Maxage
  Router        2        0        0
  Network       1        0        0
  Summary Net   2        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    0        0        0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Type-5 Ext    2        0        0
      Prefixes redistributed in Type-5  0
  Opaque AS     0        0        0
  Non-self      5
  Total         7        0        0
R6#



R7#sh ip route
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C        10.0.0.0/24 is directly connected, FastEthernet0/0
L        10.0.0.7/32 is directly connected, FastEthernet0/0
C        10.1.0.0/24 is directly connected, FastEthernet1/0
L        10.1.0.7/32 is directly connected, FastEthernet1/0
O        10.2.0.0/24 [110/2] via 10.1.0.8, 00:01:59, FastEthernet1/0
O        10.10.10.6/32 [110/2] via 10.0.0.6, 00:01:59, FastEthernet0/0
      172.16.0.0/24 is subnetted, 2 subnets
O N2     172.16.3.0 [110/200] via 10.1.0.8, 00:01:59, FastEthernet1/0
O N2     172.16.4.0 [110/200] via 10.1.0.8, 00:01:59, FastEthernet1/0
R7#
R7#sh ip ospf database database-summary

            OSPF Router with ID (10.1.0.7) (Process ID 10)

Area 0 database summary
  LSA Type      Count    Delete   Maxage
  Router        2        0        0
  Network       1        0        0
  Summary Net   2        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    0        0        0
    Prefixes redistributed in Type-7  0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Subtotal      5        0        0

Area 1 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       2        0        0
  Summary Net   1        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    2        0        0
    Prefixes redistributed in Type-7  0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Subtotal      8        0        0

Process 10 database summary
  LSA Type      Count    Delete   Maxage
  Router        5        0        0
  Network       3        0        0
  Summary Net   3        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    2        0        0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Type-5 Ext    2        0        0
      Prefixes redistributed in Type-5  0
  Opaque AS     0        0        0
  Non-self      8
  Total         15       0        0
R7#



R8#sh ip route

Gateway of last resort is 10.1.0.7 to network 0.0.0.0

O*IA  0.0.0.0/0 [110/2] via 10.1.0.7, 00:02:49, FastEthernet1/0
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.0.0/24 is directly connected, FastEthernet1/0
L        10.1.0.8/32 is directly connected, FastEthernet1/0
C        10.2.0.0/24 is directly connected, FastEthernet0/0
L        10.2.0.8/32 is directly connected, FastEthernet0/0
      172.16.0.0/24 is subnetted, 2 subnets
O N2     172.16.3.0 [110/200] via 10.2.0.9, 00:20:36, FastEthernet0/0
O N2     172.16.4.0 [110/200] via 10.2.0.9, 00:20:36, FastEthernet0/0
R8#
R8#sh ip ospf database database-summary

            OSPF Router with ID (10.2.0.8) (Process ID 10)

Area 1 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       2        0        0
  Summary Net   1        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    2        0        0
    Prefixes redistributed in Type-7  0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Subtotal      8        0        0

Process 10 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       2        0        0
  Summary Net   1        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    2        0        0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Type-5 Ext    0        0        0
      Prefixes redistributed in Type-5  0
  Opaque AS     0        0        0
  Non-self      6
  Total         8        0        0
R8#



R9#sh ip route

Gateway of last resort is 10.2.0.8 to network 0.0.0.0

O*IA  0.0.0.0/0 [110/3] via 10.2.0.8, 00:06:03, FastEthernet0/0
      10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O        10.1.0.0/24 [110/2] via 10.2.0.8, 00:23:48, FastEthernet0/0
C        10.2.0.0/24 is directly connected, FastEthernet0/0
L        10.2.0.9/32 is directly connected, FastEthernet0/0
      172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
C        172.16.3.0/24 is directly connected, FastEthernet1/1
L        172.16.3.9/32 is directly connected, FastEthernet1/1
R        172.16.4.0/24 [120/1] via 172.16.3.10, 00:00:27, FastEthernet1/1
R9#sh ip ospf database database-summary

            OSPF Router with ID (172.16.3.9) (Process ID 10)

Area 1 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       2        0        0
  Summary Net   1        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    2        0        0
    Prefixes redistributed in Type-7  2
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Subtotal      8        0        0

Process 10 database summary
  LSA Type      Count    Delete   Maxage
  Router        3        0        0
  Network       2        0        0
  Summary Net   1        0        0
  Summary ASBR  0        0        0
  Type-7 Ext    2        0        0
  Opaque Link   0        0        0
  Opaque Area   0        0        0
  Type-5 Ext    0        0        0
      Prefixes redistributed in Type-5  0
  Opaque AS     0        0        0
  Non-self      4
  Total         8        0        0
R9#



R10#sh 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
       + - replicated route, % - next hop override

Gateway of last resort is not set

S     10.0.0.0/8 [1/0] via 172.16.3.9
      172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C        172.16.3.0/24 is directly connected, FastEthernet1/1
L        172.16.3.10/32 is directly connected, FastEthernet1/1
C        172.16.4.0/24 is directly connected, Loopback0
L        172.16.4.10/32 is directly connected, Loopback0
R10#


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