Lab 5. OSPF Totally Stub Area

• What is totally stub area? Totally stub area is not accepted not only external route, but also internal route in the routing table.
• The configuration only in ABR, not in all router that use stub area
• In here, we only add totally stub area in R2.

For basic configuration, please have a look  http://pursuingmydestiny.blogspot.com/2011/12/lab-3-ospf-standard-area.html. 

R2(config)#router ospf 2
R2(config-router)#area 1 stub no-summary


R2(config-router)#do sh run | s ospf
router ospf 2
 router-id 2.2.2.2
 log-adjacency-changes
 area 1 stub no-summary
 network 2.2.2.2 0.0.0.0 area 1
 network 12.12.12.2 0.0.0.0 area 0
 network 23.23.23.2 0.0.0.0 area 1




R3(config-router)#do sh run | s ospf
router ospf 3
 router-id 3.3.3.3
 log-adjacency-changes
 area 1 stub
 redistribute rip subnets
 network 3.3.3.3 0.0.0.0 area 1
 network 23.23.23.3 0.0.0.0 area 1

 Let's check the routing table and LSA database in R3.


R3(config-router)#do sh ip rou
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, 00:03:12, 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, 00:03:13, FastEthernet0/0

R3(config-router)#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         215         0x80000004 0x00E688 2
3.3.3.3         3.3.3.3         214         0x80000004 0x00F76B 2

                Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
23.23.23.3      3.3.3.3         209         0x80000003 0x00CC05

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
0.0.0.0         2.2.2.2         265         0x80000001 0x0075C0

Make sure the ping is ok from R3 to R1.


R3(config-router)#do ping 1.1.1.1      -----> advertise in OSPF area 0 in R1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/32/64 ms

R3(config-router)#do ping 100.100.100.1 -----> advertise in OSPF area 100 in R1
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 = 20/37/60 ms

R3(config-router)#do ping 100.100.100.4   -----> advertise from redistribute EIGRP in R1
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 = 16/33/64 ms