- 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.
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
