实验目的：验证stub区域的LSA. 类型
区域间汇总和区域外汇总
R1(config-router)#do sh run
interface Loopback0
ip address 192.168.16.1 255.255.255.0
interface Loopback1
ip address 192.168.17.1 255.255.255.0
interface Loopback2
ip address 192.168.18.1 255.255.255.0
interface Loopback3
ip address 192.168.19.1 255.255.255.0
interface Serial2/1
ip address 12.0.0.1 255.255.255.0
router ospf 100
router-id 1.1.1.1
network 12.0.0.0 0.0.0.255 area 12
network 192.168.16.0 0.0.3.255 area 12
!
R2(config-router)#do sh run
interface Loopback0
ip address 2.2.2.2 255.255.255.0
interface Serial2/1
ip address 12.0.0.2 255.255.255.0
interface Serial2/2
ip address 23.0.0.2 255.255.255.0
router ospf 100
router-id 2.2.2.2
area 12 range 192.168.16.0 255.255.252.0 在ABR上做域间汇总
network 12.0.0.0 0.0.0.255 area 12
network 23.0.0.0 0.0.0.255 area 0
R3(config-router)# do sh run
interface Serial2/1
ip address 23.0.0.3 255.255.255.0
interface Serial2/2
ip address 34.0.0.3 255.255.255.0
router ospf 100
router-id 3.3.3.3
network 23.0.0.0 0.0.0.255 area 0
network 34.0.0.0 0.0.0.255 area 34
R4#sh run
interface Loopback0
ip address 150.100.32.1 255.255.255.0
interface Loopback1
ip address 150.100.33.1 255.255.255.0
interface Loopback2
ip address 150.100.34.1 255.255.255.0
interface Serial2/1
ip address 34.0.0.4 255.255.255.0
router ospf 100
router-id 4.4.4.4
summary-address 150.100.32.0 255.255.252.0 在ASBR上汇总自治系统外部路由。
redistribute connected subnets 直连重分布到ospf 进程
network 34.0.0.0 0.0.0.255 area 34
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R2(config-if)#do sh ip rout
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.0.0.0 [110/128] via 23.0.0.3, 00:01:35, Serial2/2
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/2
192.168.17.0/32 is subnetted, 1 subnets
O 192.168.17.1 [110/65] via 12.0.0.1, 00:01:35, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
192.168.16.0/32 is subnetted, 1 subnets
O 192.168.16.1 [110/65] via 12.0.0.1, 00:01:35, Serial2/1
192.168.19.0/32 is subnetted, 1 subnets
O 192.168.19.1 [110/65] via 12.0.0.1, 00:01:36, Serial2/1
150.100.0.0/22 is subnetted, 1 subnets
O E2 150.100.32.0 [110/20] via 23.0.0.3, 00:01:36, Serial2/2
192.168.18.0/32 is subnetted, 1 subnets
O 192.168.18.1 [110/65] via 12.0.0.1, 00:01:36, Serial2/1
O 192.168.16.0/22 is a summary, 00:01:37, Null0
在ABR（R2）上做域间汇总，会多出一条到null 0的路由。用于防止过大宣告所引起的路由黑洞。
R3(config-if)#do sh ip rou
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
C 34.0.0.0 is directly connected, Serial2/2
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
O IA 12.0.0.0 [110/128] via 23.0.0.2, 00:12:14, Serial2/1
150.100.0.0/22 is subnetted, 1 subnets
O E2 150.100.32.0 [110/20] via 34.0.0.4, 00:04:04, Serial2/2
O IA 192.168.16.0/22 [110/129] via 23.0.0.2, 00:04:09, Serial2/1
经过域间和域外汇总，在R3上就会是会总后的路由。150.100.0.0/22 ，192.168.16.0/22
R4(config)#do sh ip rou
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
C 34.0.0.0 is directly connected, Serial2/1
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.0.0.0 [110/128] via 34.0.0.3, 00:10:36, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
O IA 12.0.0.0 [110/192] via 34.0.0.3, 00:10:36, Serial2/1
150.100.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 150.100.34.0/24 is directly connected, Loopback2
O 150.100.32.0/22 is a summary, 00:09:36, Null0
C 150.100.32.0/24 is directly connected, Loopback0
C 150.100.33.0/24 is directly connected, Loopback1
O IA 192.168.16.0/22 [110/193] via 34.0.0.3, 00:02:31, Serial2/1
域外汇总对自己不起作用，，只是通告给别人减少了路由条目。自己也多了一条到null 0的路由。用于防止过大宣告所引起的路由黑洞。
R1(config-router)#do sh ip ospf da
OSPF Router with ID (192.168.19.1) (Process ID 100)
Router Link States (Area 12)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 38 0x80000013 0x005297 2
192.168.19.1 192.168.19.1 38 0x80000014 0x00BA86 6
Summary Net Link States (Area 12)
Link ID ADV Router Age Seq# Checksum
23.0.0.0 2.2.2.2 55 0x8000000A 0x009143
34.0.0.0 2.2.2.2 55 0x80000007 0x008A02
Summary ASB Link States (Area 12)
Link ID ADV Router Age Seq# Checksum
4.4.4.4 2.2.2.2 55 0x80000001 0x008B18
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
150.100.32.0 4.4.4.4 1729 0x80000002 0x00A2D4 0
查看R1数据库， 在区域12中有1型，3型。4型 ，5型 LSA.
R2(config-router)# do sh ip ospf da
OSPF Router with ID (2.2.2.2) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 1705 0x8000000E 0x00CD7C 2
3.3.3.3 3.3.3.3 1599 0x80000008 0x0079D1 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
12.0.0.0 2.2.2.2 940 0x80000005 0x002BB9
34.0.0.0 3.3.3.3 1599 0x80000005 0x00EDDC
34.0.0.0 4.4.4.4 3718 0x80000002 0x00D5F3
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
4.4.4.4 3.3.3.3 1599 0x80000002 0x00E8F5
Router Link States (Area 12)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 148 0x80000014 0x0006BC 1
192.168.19.1 192.168.19.1 231 0x80000014 0x00BA86 6
Summary Net Link States (Area 12)
Link ID ADV Router Age Seq# Checksum
23.0.0.0 2.2.2.2 248 0x8000000A 0x009143
34.0.0.0 2.2.2.2 248 0x80000007 0x008A02
Summary ASB Link States (Area 12)
Link ID ADV Router Age Seq# Checksum
4.4.4.4 2.2.2.2 248 0x80000001 0x008B18
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
150.100.32.0 4.4.4.4 1923 0x80000002 0x00A2D4 0
查看R2数据库， 在区域0中有1型，3型。4型 ，5型， LSA. 在区域12中有1型，3型。4型 ，5型 LSA.
R1(config-router)#area 12 stub 将区域12 的所有路由器都配置成stub
R2(config-router)#area 12 stub
R1(config-router)#do sh ip ospf da
OSPF Router with ID (192.168.19.1) (Process ID 100)
Router Link States (Area 12)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 10 0x80000011 0x007479 2
192.168.19.1 192.168.19.1 10 0x80000012 0x00DC68 6
Summary Net Link States (Area 12)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 2.2.2.2 41 0x80000001 0x0075C0
23.0.0.0 2.2.2.2 41 0x80000009 0x00B126
34.0.0.0 2.2.2.2 41 0x80000006 0x00AAE4
配置成stub后查看R1数据库， 在区域12中有1型，3型,LSA.。
R1(config-router)#do sh ip rou
Gateway of last resort is 12.0.0.2 to network 0.0.0.0
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.0.0.0 [110/192] via 12.0.0.2, 00:03:31, Serial2/1
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.0.0.0 [110/128] via 12.0.0.2, 00:03:31, Serial2/1
C 192.168.17.0/24 is directly connected, Loopback1
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
C 192.168.16.0/24 is directly connected, Loopback0
C 192.168.19.0/24 is directly connected, Loopback3
C 192.168.18.0/24 is directly connected, Loopback2
O*IA 0.0.0.0/0 [110/65] via 12.0.0.2, 00:03:31, Serial2/1
且3型的,LSA.多了一条默认路由。
R2(config-router)#do sh ip ospf da
OSPF Router with ID (2.2.2.2) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 409 0x8000000F 0x00CB7D 2
3.3.3.3 3.3.3.3 291 0x80000009 0x0077D2 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
12.0.0.0 2.2.2.2 1645 0x80000005 0x002BB9
34.0.0.0 3.3.3.3 291 0x80000006 0x00EBDD
192.168.16.0 2.2.2.2 269 0x80000001 0x006815
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
4.4.4.4 3.3.3.3 291 0x80000003 0x00E6F6
Router Link States (Area 12)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 283 0x80000015 0x006C7D 2
192.168.19.1 192.168.19.1 283 0x80000016 0x00D46C 6
Summary Net Link States (Area 12)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 2.2.2.2 290 0x80000001 0x0075C0
23.0.0.0 2.2.2.2 290 0x8000000B 0x00AD28
34.0.0.0 2.2.2.2 290 0x80000008 0x00A6E6
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
150.100.32.0 4.4.4.4 634 0x80000003 0x00A0D5 0
配置成stub区域后，查看R2数据库， 在区域0中有1型，3型。4型，5型 ，LSA.没有变 在区域12中有1型，3型，LSA.。且3型的,LSA.多了一条默认路由。
R2(config-router)#do sh ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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 not set
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.0.0.0 [110/128] via 23.0.0.3, 00:07:13, Serial2/2
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/2
192.168.17.0/32 is subnetted, 1 subnets
O 192.168.17.1 [110/65] via 12.0.0.1, 00:07:13, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
192.168.16.0/32 is subnetted, 1 subnets
O 192.168.16.1 [110/65] via 12.0.0.1, 00:07:13, Serial2/1
192.168.19.0/32 is subnetted, 1 subnets
O 192.168.19.1 [110/65] via 12.0.0.1, 00:07:14, Serial2/1
150.100.0.0/22 is subnetted, 1 subnets
O E2 150.100.32.0 [110/20] via 23.0.0.3, 00:07:14, Serial2/2
192.168.18.0/32 is subnetted, 1 subnets
O 192.168.18.1 [110/65] via 12.0.0.1, 00:07:14, Serial2/1
O 192.168.16.0/22 is a summary, 00:07:14, Null0
R2上没有默认路由。
结论stub区域的路由器会过滤类型4 和类型5的LSA.(既不需要外部路由)，此时会产生一条默认路由，3型LSA.
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