Lab 7. OSPF Totally Not So Stubby Area (NSSA)

In NSSA, we still find LSA type 3 or inter area OSPF routing table. To make only default route come up in routing table we can make the area to be Totally NSSA.

For topology and basic configuration, please refer to http://pursuingmydestiny.blogspot.com/2011/12/lab-3-ospf-standard-area.html and previous lab http://pursuingmydestiny.blogspot.com/2011/12/lab-6-ospf-not-so-stubby-area-nssa.html.

R2(config-router)#router ospf 2

R2(config-router)#area 1 nssa no-summary

Now check the routing table in R3

R3(config)#do sh ip route

Codes: 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

Gateway of last resort is 23.23.23.2 to network 0.0.0.0

     2.0.0.0/32 is subnetted, 1 subnets

O       2.2.2.2 [110/11] via 23.23.23.2, 00:14:00, FastEthernet0/0

     33.0.0.0/32 is subnetted, 3 subnets

C       33.33.33.1 is directly connected, Loopback1

C       33.33.33.3 is directly connected, Loopback3

C       33.33.33.2 is directly connected, Loopback2

     3.0.0.0/32 is subnetted, 1 subnets

C       3.3.3.3 is directly connected, Loopback0

     23.0.0.0/24 is subnetted, 1 subnets

C       23.23.23.0 is directly connected, FastEthernet0/0

O*IA 0.0.0.0/0 [110/11] via 23.23.23.2, 00:00:37, FastEthernet0/0

R3(config)#do sh ip ospf data

            OSPF Router with ID (3.3.3.3) (Process ID 3)

                Router Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Link count

2.2.2.2         2.2.2.2         1129        0x80000004 0x0074F0 2

3.3.3.3         3.3.3.3         1128        0x80000004 0x0085D3 2

                Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum

23.23.23.3      3.3.3.3         1123        0x80000003 0x005475

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum

0.0.0.0         2.2.2.2         63          0x80000001 0x00FC31

                Type-7 AS External Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Tag

0.0.0.0         2.2.2.2         490         0x80000001 0x00D0D8 0

33.33.33.1      3.3.3.3         1136        0x80000001 0x00DC3D 0

33.33.33.2      3.3.3.3         1139        0x80000001 0x00D246 0

33.33.33.3      3.3.3.3         1139        0x80000001 0x00C84F 0

Let’s try ping to area 100 (IP 100.100.100.1-100.100.100.3) and routing external from EIGRP (IP 100.100.100.4-100.100.100.7). It should be ping able.

R3(config)#do ping 100.100.100.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/54/96 ms

R3(config)#do ping 100.100.100.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 8/40/72 ms

R3(config)#do ping 100.100.100.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/36/52 ms

R3(config)#do ping 100.100.100.4

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 24/37/68 ms

R3(config)#do ping 100.100.100.5

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.5, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/40/76 ms

R3(config)#do ping 100.100.100.6

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.6, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/46/80 ms

R3(config)#do ping 100.100.100.7

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.7, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 24/50/88 ms

And make sure routing external RIP from R3 still in R1 and ping able.

R1(config)#do ping 33.33.33.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 33.33.33.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/48/88 ms

R1(config)#do ping 33.33.33.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 33.33.33.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 32/46/80 ms

R1(config)#do ping 33.33.33.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 33.33.33.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/36/56 ms