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VLSMネットワークでOSPFを使用する

ネットワーク構成図
    RIPv2、EIGRP 同様に、OSPF も VLSM をサポートしています。本シナリオではそれを確認します。
  1. RT-A に以下の設定をしなさい。
    2. ホスト名RT-A
    Lo0 のIPアドレス192.168.1.33/27
    F0/1 のIPアドレス192.168.1.1/30
    ルーティングプロトコルOSPF
    OSPF プロセス ID10
    ＜ RT-A ＞
Router# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# host RT-A
RT-A(config)# int Lo0
RT-A(config-if)# ip add 192.168.1.33 255.255.255.224
RT-A(config-if)# ip ospf network point-to-point
RT-A(config-if)# int f0/1
RT-A(config-if)# ip add 192.168.1.1 255.255.255.252
RT-A(config-if)# no shut
RT-A(config-if)# router ospf 10
RT-A(config-router)# net 192.168.1.0 0.0.0.255 area 0
RT-A(config-router)# ^Z
RT-A#
  2. RT-B に以下の設定をしなさい。
    3. ホスト名RT-B
    Lo0 のIPアドレス192.168.1.65/27
    f0/0 のIPアドレス192.168.1.2/30
    f0/1 のIPアドレス192.168.1.5/30
    ルーティングプロトコルOSPF
    OSPF プロセス ID10
    ＜ RT-B ＞
Router# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# host RT-B
RT-B(config)# int Lo0
RT-B(config-if)# ip add 192.168.1.65 255.255.255.224
RT-B(config-if)# ip ospf network point-to-point
RT-B(config-if)# int f0/0
RT-B(config-if)# ip add 192.168.1.2 255.255.255.252
RT-B(config-if)# no shut
RT-B(config-if)# int f0/1
RT-B(config-if)# ip add 192.168.1.5 255.255.255.252
RT-B(config-if)# no shut
RT-B(config-if)# router ospf 10
RT-B(config-router)# net 192.168.1.0 0.0.0.255 area 0
RT-B(config-router)# ^Z
RT-B#
  3. RT-C に以下の設定をしなさい。
    4. ホスト名RT-C
    Lo0 のIPアドレス192.168.1.97/27
    f0/0 のIPアドレス192.168.1.6/30
    ルーティングプロトコルOSPF
    OSPF プロセス ID10
    ＜ RT-C ＞
Router# conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# host RT-C
RT-C(config)# int Lo0
RT-C(config-if)# ip add 192.168.1.97 255.255.255.224
RT-C(config-if)# ip ospf network point-to-point
RT-C(config-if)# int f0/0
RT-C(config-if)# ip add 192.168.1.6 255.255.255.252
RT-C(config-if)# no shut
RT-C(config-if)# router ospf 10
RT-C(config-router)# net 192.168.1.0 0.0.0.255 area 0
RT-C(config-router)# ^Z
RT-C#
  4. 送信元アドレスに 192.168.1.33 を使い、RT-A から RT-B、RT-C それぞれの Lo0 宛てに ping を実行しなさい。
    5. ＜ RT-A ＞	
RT-A# ping 192.168.1.65 source 192.168.1.33  ← 192.168.1.33 が送信元IPアドレス
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.65, timeout is 2 seconds:
Packet sent with a source address of 192.168.1.33
!!!!!           ← ping 成功
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
RT-A#

    ＜ RT-A ＞	
RT-A# ping 192.168.1.97 source 192.168.1.33
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.97, timeout is 2 seconds:
Packet sent with a source address of 192.168.1.33
!!!!!           ← ping 成功
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
RT-A#
    ping は成功しました。OSPF も VLSM をサポートしています。
  5. RT-A、RT-B、RT-C のルーティングテーブル (OSPF) を表示させなさい。
    6. ＜ RT-A ＞
RRT-A# sh ip route ospf | begin Gateway
Gateway of last resort is not set

      192.168.1.0/24 is variably subnetted, 7 subnets, 3 masks
O        192.168.1.4/30 [110/2] via 192.168.1.2, 00:00:25, FastEthernet0/1
O        192.168.1.64/27 [110/2] via 192.168.1.2, 00:00:46, FastEthernet0/1
O        192.168.1.96/27 [110/3] via 192.168.1.2, 00:00:15, FastEthernet0/1
RT-A#

    ＜ RT-B ＞
RT-B# sh ip route ospf | begin Gateway
Gateway of last resort is not set

      192.168.1.0/24 is variably subnetted, 8 subnets, 3 masks
O        192.168.1.32/27 [110/2] via 192.168.1.1, 00:00:41, FastEthernet0/0
O        192.168.1.96/27 [110/2] via 192.168.1.6, 00:00:20, FastEthernet0/1
RT-B#

    ＜ RT-C ＞
RT-C# sh ip route ospf | begin Gateway
Gateway of last resort is not set

      192.168.1.0/24 is variably subnetted, 7 subnets, 3 masks
O        192.168.1.0/30 [110/2] via 192.168.1.5, 00:00:14, FastEthernet0/0
O        192.168.1.32/27 [110/3] via 192.168.1.5, 00:00:14, FastEthernet0/0
O        192.168.1.64/27 [110/2] via 192.168.1.5, 00:00:14, FastEthernet0/0
RT-C#
  6. RT-A、RT-B、RT-C のネイバー関係データベースを表示させなさい。
    7. ＜ RT-A ＞
RT-A# sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.65      1   FULL/DR         00:00:32    192.168.1.2     FastEthernet0/1
RT-A#

    ＜ RT-B ＞
RT-B# sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.97      1   FULL/DR         00:00:39    192.168.1.6     FastEthernet0/1
192.168.1.33      1   FULL/BDR        00:00:33    192.168.1.1     FastEthernet0/0
RT-B#

    ＜ RT-C ＞
RT-C# sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.65      1   FULL/BDR        00:00:34    192.168.1.5     FastEthernet0/0
RT-C#
  7. RT-A、RT-B、RT-C のリンクステートデータベースを表示させなさい。
    8. ＜ RT-A ＞
RT-A# sh ip ospf database

            OSPF Router with ID (192.168.1.33) (Process ID 10)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.1.33    192.168.1.33    270         0x80000002 0x00BB0B 2
192.168.1.65    192.168.1.65    250         0x80000003 0x00A5CE 3
192.168.1.97    192.168.1.97    250         0x80000002 0x0015E7 2

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
192.168.1.2     192.168.1.65    271         0x80000001 0x004F9E
192.168.1.6     192.168.1.97    251         0x80000001 0x006920
RT-A#

    ＜ RT-B ＞
RT-B# sh ip ospf database

            OSPF Router with ID (192.168.1.65) (Process ID 10)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.1.33    192.168.1.33    275         0x80000002 0x00BB0B 2
192.168.1.65    192.168.1.65    254         0x80000003 0x00A5CE 3
192.168.1.97    192.168.1.97    255         0x80000002 0x0015E7 2

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
192.168.1.2     192.168.1.65    274         0x80000001 0x004F9E
192.168.1.6     192.168.1.97    255         0x80000001 0x006920

    ＜ RT-C ＞
RT-C# sh ip ospf database

            OSPF Router with ID (192.168.1.97) (Process ID 10)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.1.33    192.168.1.33    280         0x80000002 0x00BB0B 2
192.168.1.65    192.168.1.65    259         0x80000003 0x00A5CE 3
192.168.1.97    192.168.1.97    258         0x80000002 0x0015E7 2

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
192.168.1.2     192.168.1.65    279         0x80000001 0x004F9E
192.168.1.6     192.168.1.97    258         0x80000001 0x006920
RT-C#