DynagenでCCIEを目指す
20100421 OSPF stub area
最終更新：
it_certification
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目的
- OSPFにおける、stub, totally stub, nssa, totally nssaの設定と挙動を確認します。
構成
- 設定概要
- OSPFによってルーティングします。
- R1, R3では、connectedを再配送します
- 構成図
- netファイル
ghostios = True sparsemem = True model = 3620 [localhost] [[3620]] image = C:\Program Files\Dynamips\images\c3620-j1s3-mz.123-18.bin ram = 256 [[ROUTER R1]] e0/0 = R2 e0/1 [[ROUTER R2]] e0/0 = R3 e0/1 [[ROUTER R3]]
- 初期設定 R1
! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! ! no aaa new-model ip subnet-zero ! ! ! ip cef ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Ethernet0/0 ip address 192.168.12.1 255.255.255.0 full-duplex ! interface Ethernet0/1 ip address 192.168.10.1 255.255.255.0 full-duplex no keepalive ! interface Ethernet0/2 no ip address shutdown half-duplex ! interface Ethernet0/3 no ip address shutdown half-duplex ! router ospf 1 log-adjacency-changes redistribute connected subnets network 192.168.12.0 0.0.0.255 area 0 ! ip http server ip classless ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end
- 初期設定 R2
! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R2 ! boot-start-marker boot-end-marker ! ! no aaa new-model ip subnet-zero ! ! ! ip cef ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface Ethernet0/0 ip address 192.168.23.2 255.255.255.0 full-duplex ! interface Ethernet0/1 ip address 192.168.12.2 255.255.255.0 full-duplex ! interface Ethernet0/2 no ip address shutdown half-duplex ! interface Ethernet0/3 no ip address shutdown half-duplex ! router ospf 1 log-adjacency-changes redistribute connected subnets network 192.168.12.0 0.0.0.255 area 0 network 192.168.23.0 0.0.0.255 area 1 ! ip http server ip classless ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end
- 初期設定 R3
! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R3 ! boot-start-marker boot-end-marker ! ! no aaa new-model ip subnet-zero ! ! ! ip cef ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface Ethernet0/0 ip address 192.168.30.3 255.255.255.0 full-duplex no keepalive ! interface Ethernet0/1 ip address 192.168.23.3 255.255.255.0 full-duplex ! interface Ethernet0/2 no ip address shutdown half-duplex ! interface Ethernet0/3 no ip address shutdown half-duplex ! router ospf 1 log-adjacency-changes redistribute connected subnets network 192.168.23.0 0.0.0.255 area 1 ! ip http server ip classless ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end
事前学習 LSAまとめ
LSAについてまとめます。以下の記事の引用です。
http://www.infraexpert.com/study/rp4ospf5.htm
| LSA Type | Description | 生成元 | LSAの内容 | Routing Table | show ip ospf database |
| 1 | Router LSA | 全OSPF | ルータID、リンク数、リンクの種類、コスト情報 | O | router |
| 2 | Summary LSA | DR | DRのIPアドレス、セグメント上のルータID一覧 | O | network |
| 3 | Network Summary LSA | ABR | 経路情報、コスト情報 | IA | summary |
| 4 | ASBR Summary LSA | ABR | ABRが知るASBRのルータID、コスト情報 | IA | asbr-summary |
| 5 | AS External LSA | ASBR | 再配布された経路情報、コスト情報、ネクストホップ | E1, E2 | external |
| 7 | NSSA External LSA | NSSA内のASBR | 再配布された経路情報、コスト情報、ネクストホップ | N1, N2 | nssa-external |
検証1 初期設定の確認
- ルーティングテーブルの確認
ルーティングテーブルを確認します。再配送されたルートにはE2の表記があります。R1(area 0に所属)の場合は、area 1からのルートにはIAとの表記があります。R3(area 1)の場合は、area 0からのルートにはIAとの表記があります。
R1#show ip route
- 略 -
C 192.168.12.0/24 is directly connected, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O E2 2.2.2.2 [110/20] via 192.168.12.2, 00:18:02, Ethernet0/0 <- 再配送されたルート
3.0.0.0/32 is subnetted, 1 subnets
O E2 3.3.3.3 [110/20] via 192.168.12.2, 00:18:02, Ethernet0/0 <- 再配送されたルート
O E2 192.168.30.0/24 [110/20] via 192.168.12.2, 00:18:02, Ethernet0/0 <- 再配送されたルート
C 192.168.10.0/24 is directly connected, Ethernet0/1
O IA 192.168.23.0/24 [110/20] via 192.168.12.2, 00:18:08, Ethernet0/0 <- area 1 のルート
R2#show ip route
- 略 -
C 192.168.12.0/24 is directly connected, Ethernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O E2 1.1.1.1 [110/20] via 192.168.12.1, 00:19:38, Ethernet0/1
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O E2 3.3.3.3 [110/20] via 192.168.23.3, 00:19:38, Ethernet0/0
O E2 192.168.30.0/24 [110/20] via 192.168.23.3, 00:19:38, Ethernet0/0
O E2 192.168.10.0/24 [110/20] via 192.168.12.1, 00:19:38, Ethernet0/1
C 192.168.23.0/24 is directly connected, Ethernet0/0
R3#show ip route
- 略 -
O IA 192.168.12.0/24 [110/20] via 192.168.23.2, 00:20:21, Ethernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O E2 1.1.1.1 [110/20] via 192.168.23.2, 00:20:21, Ethernet0/1
2.0.0.0/32 is subnetted, 1 subnets
O E2 2.2.2.2 [110/20] via 192.168.23.2, 00:20:21, Ethernet0/1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/0
O E2 192.168.10.0/24 [110/20] via 192.168.23.2, 00:20:21, Ethernet0/1
C 192.168.23.0/24 is directly connected, Ethernet0/1
- LSAの確認(1)
show ip ospf databaseでLSAを確認します。確認した結果は、検証2-5と比較するために使用します。
R1#show ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1217 0x80000003 0x002011 1
2.2.2.2 2.2.2.2 1214 0x80000003 0x00E442 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.1 1.1.1.1 1217 0x80000001 0x00C7EB
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 1115 0x80000003 0x00FDAA
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 2.2.2.2 1110 0x80000001 0x001905
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 1322 0x80000001 0x009BFC 0
2.2.2.2 2.2.2.2 1203 0x80000001 0x004F41 0
3.3.3.3 3.3.3.3 1127 0x80000001 0x000385 0
192.168.10.0 1.1.1.1 1322 0x80000001 0x00A97F 0
192.168.30.0 3.3.3.3 1127 0x80000001 0x00907C 0
R2#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1299 0x80000003 0x002011 1
2.2.2.2 2.2.2.2 1295 0x80000003 0x00E442 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.1 1.1.1.1 1300 0x80000001 0x00C7EB
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 1195 0x80000003 0x00FDAA
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 2.2.2.2 1191 0x80000001 0x001905
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 1206 0x80000003 0x00E12E 1
3.3.3.3 3.3.3.3 1206 0x80000003 0x00A067 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.2 2.2.2.2 1206 0x80000001 0x007A21
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.12.0 2.2.2.2 1281 0x80000003 0x00773C
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 2.2.2.2 1287 0x80000001 0x0075B0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 1405 0x80000001 0x009BFC 0
2.2.2.2 2.2.2.2 1285 0x80000001 0x004F41 0
3.3.3.3 3.3.3.3 1209 0x80000001 0x000385 0
192.168.10.0 1.1.1.1 1405 0x80000001 0x00A97F 0
192.168.30.0 3.3.3.3 1209 0x80000001 0x00907C 0
R3#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 1242 0x80000003 0x00E12E 1
3.3.3.3 3.3.3.3 1242 0x80000003 0x00A067 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.2 2.2.2.2 1243 0x80000001 0x007A21
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.12.0 2.2.2.2 1317 0x80000003 0x00773C
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 2.2.2.2 1324 0x80000001 0x0075B0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 1442 0x80000001 0x009BFC 0
2.2.2.2 2.2.2.2 1322 0x80000001 0x004F41 0
3.3.3.3 3.3.3.3 1245 0x80000001 0x000385 0
192.168.10.0 1.1.1.1 1443 0x80000001 0x00A97F 0
192.168.30.0 3.3.3.3 1245 0x80000001 0x00907C 0
- LSAの確認(2)
show ip ospf database database-summaryでLSAの総数を確認できます。
R1#show ip ospf database database-summary
OSPF Router with ID (1.1.1.1) (Process ID 1)
Area 0 database summary
LSA Type Count Delete Maxage
Router 2 0 0
Network 1 0 0
Summary Net 1 0 0
Summary ASBR 1 0 0
Type-7 Ext 0 0 0
Opaque Link 0 0 0
Opaque Area 0 0 0
Subtotal 5 0 0
Process 1 database summary
LSA Type Count Delete Maxage
Router 2 0 0
Network 1 0 0
Summary Net 1 0 0
Summary ASBR 1 0 0
Type-7 Ext 0 0 0
Opaque Link 0 0 0
Opaque Area 0 0 0
Type-5 Ext 5 0 0
Opaque AS 0 0 0
Total 10 0 0
R1#
show ip ospf database adv-router <router-id>でrouter-id毎のLSAを表示します。LSAが多すぎて見づらい場合は、このコマンドの方が便利だと思います。
R1#show ip ospf database adv-router 2.2.2.2
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 1223 0x80000003 0x00E442 1
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 1124 0x80000003 0x00FDAA
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 2.2.2.2 1120 0x80000001 0x001905
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 1213 0x80000001 0x004F41 0
検証2 stub area
- stub areaの設定
stub areaの設定を行います。以下のコマンドを投入します。
R2(config)#router ospf 1 R2(config-router)#area 1 stub R3(config)#router ospf 1 R3(config-router)#area 1 stub
- R1の確認
stub areaでは、LSA Type 4, 5が遮断されます。そのため、検証1と比較すると、R1では3.3.3.3/32と192.168.30.0/24のルートが消えている事が分かります。
R1#show ip route
- 略 -
C 192.168.12.0/24 is directly connected, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O E2 2.2.2.2 [110/20] via 192.168.12.2, 00:01:10, Ethernet0/0
C 192.168.10.0/24 is directly connected, Ethernet0/1
O IA 192.168.23.0/24 [110/20] via 192.168.12.2, 00:01:15, Ethernet0/0
R1#show ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 44 0x80000004 0x001E12 1
2.2.2.2 2.2.2.2 1879 0x80000003 0x00E442 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.1 1.1.1.1 45 0x80000002 0x00C5EC
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 92 0x80000007 0x00F5AE
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 45 0x80000002 0x0099FD 0
2.2.2.2 2.2.2.2 1869 0x80000001 0x004F41 0
192.168.10.0 1.1.1.1 45 0x80000002 0x00A780 0
R1#
R2でも同様に3.3.3.3/32と192.168.30.0/24が消えています。
R2#show ip route
- 略 -
C 192.168.12.0/24 is directly connected, Ethernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O E2 1.1.1.1 [110/20] via 192.168.12.1, 00:01:50, Ethernet0/1
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
O E2 192.168.10.0/24 [110/20] via 192.168.12.1, 00:01:50, Ethernet0/1
C 192.168.23.0/24 is directly connected, Ethernet0/0
R2#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 72 0x80000004 0x001E12 1
2.2.2.2 2.2.2.2 1905 0x80000003 0x00E442 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.1 1.1.1.1 72 0x80000002 0x00C5EC
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 118 0x80000007 0x00F5AE
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 118 0x80000006 0x00FD12 1
3.3.3.3 3.3.3.3 128 0x80000005 0x00BE4A 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.3 3.3.3.3 130 0x80000001 0x006038
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 2.2.2.2 156 0x80000001 0x0075C0
192.168.12.0 2.2.2.2 156 0x80000004 0x009321
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 73 0x80000002 0x0099FD 0
2.2.2.2 2.2.2.2 1895 0x80000001 0x004F41 0
192.168.10.0 1.1.1.1 73 0x80000002 0x00A780 0
R3では、再配送されたルート1.1.1.1/32と2.2.2.2/32が消えています。
R3#show ip route
O IA 192.168.12.0/24 [110/20] via 192.168.23.2, 00:02:17, Ethernet0/1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/0
C 192.168.23.0/24 is directly connected, Ethernet0/1
O*IA 0.0.0.0/0 [110/11] via 192.168.23.2, 00:02:17, Ethernet0/1
R3#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 154 0x80000006 0x00FD12 1
3.3.3.3 3.3.3.3 163 0x80000005 0x00BE4A 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.3 3.3.3.3 162 0x80000001 0x006038
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 2.2.2.2 190 0x80000001 0x0075C0
192.168.12.0 2.2.2.2 190 0x80000004 0x009321
R3#
検証3 totally stub area
- totally stub areaの設定
totally stub areaの設定を行います。
R2(config)#router ospf 1 R2(config-router)#area 1 stub no-summary
- R3の確認
totally stub areaでは、デフォルトルートを除くsummary route(LSA type 3)が遮断されます。検証2 stub areaと比較して、R3のルーティングテーブルを見ると、192.168.12.0/24が消えて、デフォルトルートが加わったのが分かります。
R3#show ip route
- 略 -
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/0
C 192.168.23.0/24 is directly connected, Ethernet0/1
O*IA 0.0.0.0/0 [110/11] via 192.168.23.2, 00:00:35, Ethernet0/1 <- デフォルトルート
R3#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 193 0x80000007 0x00FB13 1
3.3.3.3 3.3.3.3 62 0x80000006 0x00BC4B 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.3 3.3.3.3 360 0x80000001 0x006038
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 2.2.2.2 44 0x80000002 0x0073C1 <- R2から通知されたデフォルトルート
R3#
検証4 nssa
- nssaの設定
nssaの設定を行います。以下の設定を投入します。
R2(config)#router ospf 1 R2(config-router)#no area 1 stub R2(config-router)#area 1 nssa R3(config)#router ospf 1 R3(config-router)#no area 1 stub R3(config-router)#area 1 nssa
- R1の確認
stubと異なり、外部ルートがルーティングテーブルに載っているのが確認できます。
R1#show ip route
- 略 -
C 192.168.12.0/24 is directly connected, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O E2 2.2.2.2 [110/20] via 192.168.12.2, 00:00:08, Ethernet0/0 <- R2でType7がType5に変換したルート
3.0.0.0/32 is subnetted, 1 subnets
O E2 3.3.3.3 [110/20] via 192.168.12.2, 00:00:07, Ethernet0/0 <- R2でType7がType5に変換したルート
O E2 192.168.30.0/24 [110/20] via 192.168.12.2, 00:00:07, Ethernet0/0 <- R2でType7がType5に変換したルート
C 192.168.10.0/24 is directly connected, Ethernet0/1
O IA 192.168.23.0/24 [110/20] via 192.168.12.2, 00:00:13, Ethernet0/0
R1#show ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 540 0x80000004 0x001E12 1
2.2.2.2 2.2.2.2 429 0x80000004 0x00E243 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.1 1.1.1.1 540 0x80000002 0x00C5EC
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 18 0x8000000B 0x00EDB2
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 540 0x80000002 0x0099FD 0
2.2.2.2 2.2.2.2 429 0x80000002 0x004D42 0
3.3.3.3 2.2.2.2 13 0x80000001 0x00A761 0 <- R2でType7がType5に変換されたルート
192.168.10.0 1.1.1.1 541 0x80000002 0x00A780 0
192.168.30.0 2.2.2.2 13 0x80000001 0x003558 0 <- R2でType7がType5に変換されたルート
R1#
- R2の確認
R3から通知された外部ルートには「N2と表記されています。」
R2#show ip route
- 略 -
C 192.168.12.0/24 is directly connected, Ethernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O E2 1.1.1.1 [110/20] via 192.168.12.1, 00:00:26, Ethernet0/1
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O N2 3.3.3.3 [110/20] via 192.168.23.3, 00:00:26, Ethernet0/0 <- R3から通知された外部ルート
O N2 192.168.30.0/24 [110/20] via 192.168.23.3, 00:00:26, Ethernet0/0 <- R3から通知された外部ルート
O E2 192.168.10.0/24 [110/20] via 192.168.12.1, 00:00:26, Ethernet0/1
C 192.168.23.0/24 is directly connected, Ethernet0/0
R2#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 560 0x80000004 0x001E12 1
2.2.2.2 2.2.2.2 448 0x80000004 0x00E243 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.1 1.1.1.1 560 0x80000002 0x00C5EC
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.23.0 2.2.2.2 36 0x8000000B 0x00EDB2
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 46 0x80000009 0x00857D 1
3.3.3.3 3.3.3.3 46 0x8000000A 0x0042B7 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.3 3.3.3.3 42 0x80000002 0x00E5A9
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.12.0 2.2.2.2 89 0x80000002 0x001F8F
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 88 0x80000001 0x00AB60 0
3.3.3.3 3.3.3.3 54 0x80000001 0x00F406 0
192.168.30.0 3.3.3.3 54 0x80000001 0x0082FC 0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
1.1.1.1 1.1.1.1 561 0x80000002 0x0099FD 0
2.2.2.2 2.2.2.2 448 0x80000002 0x004D42 0
3.3.3.3 2.2.2.2 31 0x80000001 0x00A761 0
192.168.10.0 1.1.1.1 561 0x80000002 0x00A780 0
192.168.30.0 2.2.2.2 31 0x80000001 0x003558 0
R2#
- R3の確認
R3は以下の通りです。
R3#show ip route
- 略 -
O IA 192.168.12.0/24 [110/20] via 192.168.23.2, 00:00:50, Ethernet0/1
2.0.0.0/32 is subnetted, 1 subnets
O N2 2.2.2.2 [110/20] via 192.168.23.2, 00:00:50, Ethernet0/1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/0
C 192.168.23.0/24 is directly connected, Ethernet0/1
R3#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 68 0x80000009 0x00857D 1
3.3.3.3 3.3.3.3 68 0x8000000A 0x0042B7 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.3 3.3.3.3 63 0x80000002 0x00E5A9
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.12.0 2.2.2.2 111 0x80000002 0x001F8F
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 110 0x80000001 0x00AB60 0
3.3.3.3 3.3.3.3 75 0x80000001 0x00F406 0
192.168.30.0 3.3.3.3 75 0x80000001 0x0082FC 0
検証5 totally nssa
- totally nssaの設定
totally nssaの設定を行います。以下の設定を投入します。
R2(config)#router ospf 1 R2(config-router)#area 1 nssa no-summary
- ルーティングテーブルとLSAの確認
検証4 nssaと異なり、summary（デフォルトルートを除く）が遮断されます。R3のルーティングテーブルから192.168.12.0/24が消え、デフォルトルートが追加されている事が確認できます。
R3#show ip route
- 略 -
2.0.0.0/32 is subnetted, 1 subnets
O N2 2.2.2.2 [110/20] via 192.168.23.2, 00:00:17, Ethernet0/1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/0
C 192.168.23.0/24 is directly connected, Ethernet0/1
O*IA 0.0.0.0/0 [110/11] via 192.168.23.2, 00:00:22, Ethernet0/1
R3#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 143 0x80000009 0x00857D 1
3.3.3.3 3.3.3.3 142 0x8000000A 0x0042B7 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.23.3 3.3.3.3 137 0x80000002 0x00E5A9
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 2.2.2.2 29 0x80000001 0x00FC31
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 184 0x80000001 0x00AB60 0
3.3.3.3 3.3.3.3 149 0x80000001 0x00F406 0
192.168.30.0 3.3.3.3 150 0x80000001 0x0082FC 0
添付ファイル
