STUB Area
1. Area 3 is stub
2. R9 Redistributing 99.9.9.9/32 into Ospf as E2 route
Stub Area does not have LSA 4 & LSA 5
in R5 & R6
router ospf 10
area 3 stub
R9
Lo10 99.9.9.9/32
router ospf 10
auto-cost reference-bandwidth 1000
redistribute connected metric 50 subnets route-map con
ip prefix-list con seq 5 permit 99.9.9.9/32
!
route-map con permit 10
match ip address prefix-list con
**************Database & Route************
R6
R6#sh ip route
::::::::::::::
Gateway of last resort is 56.0.0.5 to network 0.0.0.0
O*IA 0.0.0.0/0 [110/11] via 56.0.0.5, 00:09:03, FastEthernet0/1
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/11] via 56.0.0.5, 00:09:03, FastEthernet0/1
6.0.0.0/32 is subnetted, 1 subnets
C 6.6.6.6 is directly connected, Loopback0
9.0.0.0/32 is subnetted, 1 subnets
O IA 9.9.9.9 [110/10021] via 56.0.0.5, 00:09:03, FastEthernet0/1
13.0.0.0/24 is subnetted, 1 subnets
O IA 13.0.0.0 [110/30] via 56.0.0.5, 00:09:03, FastEthernet0/1
15.0.0.0/24 is subnetted, 1 subnets
O IA 15.0.0.0 [110/20] via 56.0.0.5, 00:09:03, FastEthernet0/1
16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 16.0.0.0/24 is directly connected, FastEthernet0/0
L 16.0.0.6/32 is directly connected, FastEthernet0/0
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.0.0.0 [110/30] via 56.0.0.5, 00:09:04, FastEthernet0/1
25.0.0.0/24 is subnetted, 1 subnets
O IA 25.0.0.0 [110/20] via 56.0.0.5, 00:09:04, FastEthernet0/1
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.0.0.0 [110/31] via 56.0.0.5, 00:09:04, FastEthernet0/1
55.0.0.0/32 is subnetted, 1 subnets
O IA 55.5.5.5 [110/11] via 56.0.0.5, 00:09:04, FastEthernet0/1
56.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 56.0.0.0/24 is directly connected, FastEthernet0/1
L 56.0.0.6/32 is directly connected, FastEthernet0/1
66.0.0.0/8 is variably subnetted, 9 subnets, 2 masks
C 66.1.0.0/24 is directly connected, Loopback2
L 66.1.0.1/32 is directly connected, Loopback2
C 66.1.1.0/24 is directly connected, Loopback3
L 66.1.1.1/32 is directly connected, Loopback3
C 66.1.2.0/24 is directly connected, Loopback4
L 66.1.2.1/32 is directly connected, Loopback4
C 66.1.3.0/24 is directly connected, Loopback5
L 66.1.3.1/32 is directly connected, Loopback5
C 66.6.6.6/32 is directly connected, Loopback1
102.0.0.0/24 is subnetted, 1 subnets
O IA 102.1.0.0 [110/21] via 56.0.0.5, 00:09:05, FastEthernet0/1
172.16.0.0/32 is subnetted, 3 subnets
O IA 172.16.0.2 [110/20] via 56.0.0.5, 00:09:05, FastEthernet0/1
O IA 172.16.0.4 [110/31] via 56.0.0.5, 00:09:05, FastEthernet0/1
O IA 172.16.0.9 [110/10020] via 56.0.0.5, 00:09:05, FastEthernet0/1
************
R6# sh ip ospf database
OSPF Router with ID (66.6.6.6) (Process ID 10)
Router Link States (Area 3) LSA 1
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 2094 (DNA) 0x8000000B 0x009C53 1
55.5.5.5 55.5.5.5 132 (DNA) 0x80000041 0x00DC79 3
66.6.6.6 66.6.6.6 636 0x80000043 0x0060B7 4
Summary Net Link States (Area 3) LSA 3
Link ID ADV Router Age Seq# Checksum
0.0.0.0 55.5.5.5 158 (DNA) 0x80000001 0x0057A0
9.9.9.9 1.1.1.1 2094 (DNA) 0x8000000A 0x008D32
9.9.9.9 55.5.5.5 157 (DNA) 0x80000010 0x00FE84
13.0.0.0 1.1.1.1 2094 (DNA) 0x8000000A 0x001405
13.0.0.0 55.5.5.5 157 (DNA) 0x8000000D 0x005477
15.0.0.0 1.1.1.1 2094 (DNA) 0x8000000A 0x00F91D
15.0.0.0 55.5.5.5 157 (DNA) 0x8000000D 0x00D5FD
23.0.0.0 1.1.1.1 2094 (DNA) 0x8000000A 0x00F50F
23.0.0.0 55.5.5.5 157 (DNA) 0x80000010 0x00CBF2
::::::::::::::::::;;
We can see no LSA 4 & 5 in the AREA 3 ( No Route for 99.9.9.9/32 and one default route is installed in routing tale,
while in R5
R5# sh ip route 99.9.9.9
Routing entry for 99.9.9.9/32
Known via "ospf 10", distance 110, metric 50, type extern 2, forward metric 10010
Last update from 25.0.0.2 on FastEthernet0/0, 00:08:16 ago
Routing Descriptor Blocks:
* 25.0.0.2, from 172.16.0.9, 00:08:16 ago, via FastEthernet0/0
Route metric is 50, traffic share count is 1
R5#
R5#sh ip ospf database
OSPF Router with ID (55.5.5.5) (Process ID 10)
Router Link States (Area 0) LSA 1
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1120 0x8000003A 0x00FB94 2
2.2.2.2 2.2.2.2 878 0x8000005E 0x004479 3
39.1.4.1 39.1.4.1 1590 0x8000004D 0x005763 3
44.4.4.4 44.4.4.4 802 0x80000034 0x00AA97 1
55.5.5.5 55.5.5.5 767 0x80000058 0x001262 3
Net Link States (Area 0) LSA 2
Link ID ADV Router Age Seq# Checksum
13.0.0.3 39.1.4.1 576 0x8000001F 0x008B22
15.0.0.1 1.1.1.1 1120 0x8000000F 0x00DCF0
23.0.0.3 39.1.4.1 1590 0x80000014 0x005159
25.0.0.5 55.5.5.5 767 0x8000000C 0x002557
34.0.0.4 44.4.4.4 802 0x80000021 0x00381E
Summary Net Link States (Area 0) LSA 3
Link ID ADV Router Age Seq# Checksum
5.5.5.5 55.5.5.5 1287 0x8000000C 0x003C9A
6.6.6.6 55.5.5.5 902 0x80000003 0x00844D
9.9.9.9 2.2.2.2 1624 0x8000000C 0x00A22B
9.9.9.9 44.4.4.4 1564 0x8000000C 0x00FD68
16.0.0.0 1.1.1.1 1123 0x8000000B 0x00EA2A
16.0.0.0 55.5.5.5 902 0x80000003 0x0023AD
56.0.0.0 55.5.5.5 1290 0x8000000C 0x00A207
172.16.0.2 2.2.2.2 1624 0x8000000C 0x009DCD
172.16.0.2 44.4.4.4 1564 0x8000000C 0x00F80B
172.16.0.4 2.2.2.2 1624 0x8000000C 0x008AA7
172.16.0.4 44.4.4.4 299 0x80000025 0x00B16E
172.16.0.9 2.2.2.2 1624 0x8000000C 0x0058D4
172.16.0.9 44.4.4.4 1564 0x8000000C 0x00B312
Summary ASB Link States (Area 0) LSA 4
Link ID ADV Router Age Seq# Checksum
172.16.0.9 2.2.2.2 623 0x80000001 0x0060D6
172.16.0.9 44.4.4.4 624 0x80000001 0x00BB14
Router Link States (Area 3) LSA1
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 2093 (DNA) 0x8000000B 0x009C53 1
55.5.5.5 55.5.5.5 1049 0x80000041 0x00DC79 3
66.6.6.6 66.6.6.6 1 (DNA) 0x80000043 0x0060B7 4
Summary Net Link States (Area 3) LSA 3
Link ID ADV Router Age Seq# Checksum
0.0.0.0 55.5.5.5 1075 0x80000001 0x0057A0
9.9.9.9 1.1.1.1 2093 (DNA) 0x8000000A 0x008D32
9.9.9.9 55.5.5.5 771 0x80000011 0x00FC85
13.0.0.0 1.1.1.1 2093 (DNA) 0x8000000A 0x001405
13.0.0.0 55.5.5.5 1075 0x8000000D 0x005477
15.0.0.0 1.1.1.1 2093 (DNA) 0x8000000A 0x00F91D
15.0.0.0 55.5.5.5 1075 0x8000000D 0x00D5FD
23.0.0.0 1.1.1.1 2093 (DNA) 0x8000000A 0x00F50F
23.0.0.0 55.5.5.5 771 0x80000011 0x00C9F3
25.0.0.0 1.1.1.1 2093 (DNA) 0x8000000A 0x00DB27
25.0.0.0 55.5.5.5 1075 0x8000000D 0x005376
34.0.0.0 1.1.1.1 2093 (DNA) 0x8000000A 0x000CF6
34.0.0.0 55.5.5.5 1075 0x8000000D 0x004C69
55.5.5.5 1.1.1.1 2093 (DNA) 0x8000000A 0x00548A
55.5.5.5 55.5.5.5 1075 0x8000000D 0x00CBD9
102.1.0.0 1.1.1.1 2093 (DNA) 0x8000000A 0x00ECC6
102.1.0.0 55.5.5.5 772 0x80000011 0x005C1A
172.16.0.2 1.1.1.1 2093 (DNA) 0x8000000A 0x0088D4
172.16.0.2 55.5.5.5 772 0x80000011 0x00F728
172.16.0.4 1.1.1.1 2093 (DNA) 0x8000000A 0x001A4A
172.16.0.4 55.5.5.5 1075 0x8000000D 0x005ABC
172.16.0.9 1.1.1.1 2093 (DNA) 0x8000000A 0x0043DB
172.16.0.9 55.5.5.5 772 0x80000011 0x00B22F
Type-5 AS External Link States LSA 5
Link ID ADV Router Age Seq# Checksum Tag
99.9.9.9 172.16.0.9 630 0x80000001 0x001628 0
R5#
****Area 3 does not have LSA 4 and LSA 5
Totally stub
in R5 & R6
Router ospf 10
area 3 stub no-summary
R6
O*IA 0.0.0.0/0 [110/11] via 56.0.0.5, 00:02:11, FastEthernet0/1
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/11] via 56.0.0.5, 00:02:11, FastEthernet0/1
R6#
R6#sh ip ospf database
OSPF Router with ID (66.6.6.6) (Process ID 10)
Router Link States (Area 3)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 2094 (DNA) 0x8000000B 0x009C53 1
55.5.5.5 55.5.5.5 1 (DNA) 0x80000046 0x00D27E 3
66.6.6.6 66.6.6.6 223 0x80000048 0x00CD6F 3
Summary Net Link States (Area 3)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 55.5.5.5 638 (DNA) 0x80000003 0x0053A2
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