DynagenでCCIEを目指す
20100508 再配送と経路集約
最終更新：
it_certification
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目的
- 再配送したルートを集約する方法を確認します。
構成
- 設定概要
- RIP, OSPFによってルーティングします。
- IPv4, IPv6並存環境です。
- 構成図
- netファイル
ghostios = True sparsemem = True model = 3660 [localhost] [[3660]] image = C:\Program Files\Dynamips\images\c3660-ik9o3s-mz.124-6.T.bin ram = 256 [[ROUTER R1]] e1/0 = R2 e1/0 [[ROUTER R2]] e1/1 = R3 e1/0 [[ROUTER R3]]
- 初期設定 R1
! version 12.4 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 ! resource policy ! memory-size iomem 5 ! ! ip cef ! ! ! ipv6 unicast-routing ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Ethernet1/0 ip address 10.0.10.1 255.255.255.0 full-duplex ipv6 address 2000::10:1/112 ipv6 enable ipv6 ospf 1 area 0 ! interface Ethernet1/1 ip address 10.0.1.1 255.255.255.0 full-duplex ipv6 address 2000::1:1/112 ipv6 enable ipv6 ospf 1 area 0 ! interface Ethernet1/2 ip address 10.0.2.1 255.255.255.0 full-duplex ipv6 address 2000::2:1/112 ipv6 enable ipv6 ospf 1 area 0 ! interface Ethernet1/3 ip address 10.0.3.1 255.255.255.0 full-duplex ipv6 address 2000::3:1/112 ipv6 enable ipv6 ospf 1 area 0 ! router ospf 1 log-adjacency-changes network 10.0.1.1 0.0.0.0 area 0 network 10.0.2.1 0.0.0.0 area 0 network 10.0.3.1 0.0.0.0 area 0 network 10.0.10.1 0.0.0.0 area 0 ! ip http server no ip http secure-server ! ! ! ipv6 router ospf 1 log-adjacency-changes ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end
- 初期設定 R2
! version 12.4 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 ! resource policy ! memory-size iomem 5 ! ! ip cef ! ! ! ipv6 unicast-routing ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Ethernet1/0 ip address 10.0.10.1 255.255.255.0 full-duplex ipv6 address 2000::10:1/112 ipv6 enable ipv6 ospf 1 area 0 ! interface Ethernet1/1 ip address 10.0.1.1 255.255.255.0 full-duplex ipv6 address 2000::1:1/112 ipv6 enable ipv6 ospf 1 area 0 ! interface Ethernet1/2 ip address 10.0.2.1 255.255.255.0 full-duplex ipv6 address 2000::2:1/112 ipv6 enable ipv6 ospf 1 area 0 ! interface Ethernet1/3 ip address 10.0.3.1 255.255.255.0 full-duplex ipv6 address 2000::3:1/112 ipv6 enable ipv6 ospf 1 area 0 ! router ospf 1 log-adjacency-changes network 10.0.1.1 0.0.0.0 area 0 network 10.0.2.1 0.0.0.0 area 0 network 10.0.3.1 0.0.0.0 area 0 network 10.0.10.1 0.0.0.0 area 0 ! ip http server no ip http secure-server ! ! ! ipv6 router ospf 1 log-adjacency-changes ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end
- 初期設定 R3
! version 12.4 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 ! resource policy ! memory-size iomem 5 ! ! ip cef ! ! ! ipv6 unicast-routing ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Ethernet1/0 ip address 10.0.20.3 255.255.255.0 full-duplex ipv6 address 2000::20:3/112 ipv6 enable ipv6 rip HOGE enable ! interface Ethernet1/1 ip address 10.0.31.3 255.255.255.0 full-duplex ipv6 address 2000::31:3/112 ipv6 enable ipv6 rip HOGE enable ! interface Ethernet1/2 ip address 10.0.32.3 255.255.255.0 full-duplex ipv6 address 2000::32:3/112 ipv6 enable ipv6 rip HOGE enable ! interface Ethernet1/3 ip address 10.0.33.3 255.255.255.0 full-duplex ipv6 address 2000::33:3/112 ipv6 enable ipv6 rip HOGE enable ! router rip network 10.0.0.0 ! ip http server no ip http secure-server ! ! ! ipv6 router rip HOGE ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end
検証1 設定の確認
- ルーティングテーブルの確認
IPv4ルーティングテーブルを確認します。再配送が設定されていないので、R1, R3が互いに経路を交換できていない事が確認できます。
R1#show ip route
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 not set
10.0.0.0/24 is subnetted, 4 subnets
C 10.0.10.0 is directly connected, Ethernet1/0
C 10.0.2.0 is directly connected, Ethernet1/2
C 10.0.3.0 is directly connected, Ethernet1/3
C 10.0.1.0 is directly connected, Ethernet1/1
R1#
R2#show ip route
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 not set
10.0.0.0/24 is subnetted, 8 subnets
C 10.0.10.0 is directly connected, Ethernet1/0
O 10.0.2.0 [110/20] via 10.0.10.1, 00:18:10, Ethernet1/0
O 10.0.3.0 [110/20] via 10.0.10.1, 00:18:10, Ethernet1/0
O 10.0.1.0 [110/20] via 10.0.10.1, 00:18:10, Ethernet1/0
R 10.0.31.0 [120/1] via 10.0.20.3, 00:00:21, Ethernet1/1
C 10.0.20.0 is directly connected, Ethernet1/1
R 10.0.32.0 [120/1] via 10.0.20.3, 00:00:21, Ethernet1/1
R 10.0.33.0 [120/1] via 10.0.20.3, 00:00:21, Ethernet1/1
R2#
R3#show ip route
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 not set
10.0.0.0/24 is subnetted, 5 subnets
R 10.0.10.0 [120/1] via 10.0.20.2, 00:00:00, Ethernet1/0
C 10.0.31.0 is directly connected, Ethernet1/1
C 10.0.20.0 is directly connected, Ethernet1/0
C 10.0.32.0 is directly connected, Ethernet1/2
C 10.0.33.0 is directly connected, Ethernet1/3
R3#
IPv6も同様に、再配送が設定されていないので、R1, R3が互いに経路を交換できていない事が確認できます。
R1#show ipv6 route
IPv6 Routing Table - 10 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
C 2000::1:0/112 [0/0]
via ::, Ethernet1/1
L 2000::1:1/128 [0/0]
via ::, Ethernet1/1
C 2000::2:0/112 [0/0]
via ::, Ethernet1/2
L 2000::2:1/128 [0/0]
via ::, Ethernet1/2
C 2000::3:0/112 [0/0]
via ::, Ethernet1/3
L 2000::3:1/128 [0/0]
via ::, Ethernet1/3
C 2000::10:0/112 [0/0]
via ::, Ethernet1/0
L 2000::10:1/128 [0/0]
via ::, Ethernet1/0
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R1#
R2#show ipv6 route
IPv6 Routing Table - 12 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
O 2000::1:0/112 [110/20]
via FE80::CE00:7FF:FEEC:10, Ethernet1/0
O 2000::2:0/112 [110/20]
via FE80::CE00:7FF:FEEC:10, Ethernet1/0
O 2000::3:0/112 [110/20]
via FE80::CE00:7FF:FEEC:10, Ethernet1/0
C 2000::10:0/112 [0/0]
via ::, Ethernet1/0
L 2000::10:2/128 [0/0]
via ::, Ethernet1/0
C 2000::20:0/112 [0/0]
via ::, Ethernet1/1
L 2000::20:2/128 [0/0]
via ::, Ethernet1/1
R 2000::31:0/112 [120/2]
via FE80::CE02:7FF:FEEC:10, Ethernet1/1
R 2000::32:0/112 [120/2]
via FE80::CE02:7FF:FEEC:10, Ethernet1/1
R 2000::33:0/112 [120/2]
via FE80::CE02:7FF:FEEC:10, Ethernet1/1
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R2#
R3#show ipv6 route
IPv6 Routing Table - 10 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
C 2000::20:0/112 [0/0]
via ::, Ethernet1/0
L 2000::20:3/128 [0/0]
via ::, Ethernet1/0
C 2000::31:0/112 [0/0]
via ::, Ethernet1/1
L 2000::31:3/128 [0/0]
via ::, Ethernet1/1
C 2000::32:0/112 [0/0]
via ::, Ethernet1/2
L 2000::32:3/128 [0/0]
via ::, Ethernet1/2
C 2000::33:0/112 [0/0]
via ::, Ethernet1/3
L 2000::33:3/128 [0/0]
via ::, Ethernet1/3
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R3#
検証2 再配送の設定
- 再配送の設定
以下の通り、R2で再配送を定義します。なお、RIPngからOSPFv3への再配送でtagを定義していますが、これは必須の設定ではありません。ルーティングテーブルにtagが表示され、分かりやすくなるだけです(数字だけではなく文字列でもタグが定義できたら、便利なのに…)。
R2(config)#router ospf 1 R2(config-router)#redistribute rip metric 50 metric-type 1 subnets R2(config-router)#exit R2(config)#router rip R2(config-router)#redistribute ospf 1 metric 5 R2(config-router)#exit R2(config)#ipv6 router ospf 1 R2(config-rtr)#redistribute rip HOGE tag 10 metric 5 R2(config-rtr)#exit R2(config)#ipv6 router rip R2(config)#ipv6 router rip HOGE R2(config-rtr)#redistribute ospf 1 metric 5
- IPv4ルーティングテーブルの確認
IPv4ルーティングテーブルを確認します。全てのルートがテーブル上に載っており、問題なくルーティングできます。
R1#show ip route
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 not set
10.0.0.0/24 is subnetted, 8 subnets
C 10.0.10.0 is directly connected, Ethernet1/0
C 10.0.2.0 is directly connected, Ethernet1/2
C 10.0.3.0 is directly connected, Ethernet1/3
C 10.0.1.0 is directly connected, Ethernet1/1
O E1 10.0.31.0 [110/60] via 10.0.10.2, 00:04:26, Ethernet1/0
O E1 10.0.20.0 [110/60] via 10.0.10.2, 00:04:26, Ethernet1/0
O E1 10.0.32.0 [110/60] via 10.0.10.2, 00:04:26, Ethernet1/0
O E1 10.0.33.0 [110/60] via 10.0.10.2, 00:04:26, Ethernet1/0
R1#
R2#show ip route
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 not set
10.0.0.0/24 is subnetted, 8 subnets
C 10.0.10.0 is directly connected, Ethernet1/0
O 10.0.2.0 [110/20] via 10.0.10.1, 00:04:46, Ethernet1/0
O 10.0.3.0 [110/20] via 10.0.10.1, 00:04:46, Ethernet1/0
O 10.0.1.0 [110/20] via 10.0.10.1, 00:04:46, Ethernet1/0
R 10.0.31.0 [120/1] via 10.0.20.3, 00:00:00, Ethernet1/1
C 10.0.20.0 is directly connected, Ethernet1/1
R 10.0.32.0 [120/1] via 10.0.20.3, 00:00:00, Ethernet1/1
R 10.0.33.0 [120/1] via 10.0.20.3, 00:00:00, Ethernet1/1
R2#
R3#show ip route
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 not set
10.0.0.0/24 is subnetted, 8 subnets
R 10.0.10.0 [120/1] via 10.0.20.2, 00:00:07, Ethernet1/0
R 10.0.2.0 [120/5] via 10.0.20.2, 00:00:07, Ethernet1/0
R 10.0.3.0 [120/5] via 10.0.20.2, 00:00:07, Ethernet1/0
R 10.0.1.0 [120/5] via 10.0.20.2, 00:00:07, Ethernet1/0
C 10.0.31.0 is directly connected, Ethernet1/1
C 10.0.20.0 is directly connected, Ethernet1/0
C 10.0.32.0 is directly connected, Ethernet1/2
C 10.0.33.0 is directly connected, Ethernet1/3
R3#
- IPv6ルーティングテーブルの確認
IPv6ルーティングテーブルを確認します。R1は2000::20:0/112を、R3は2000::10:0/112を認識していません。
R1#show ipv6 route
IPv6 Routing Table - 13 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
C 2000::1:0/112 [0/0]
via ::, Ethernet1/1
L 2000::1:1/128 [0/0]
via ::, Ethernet1/1
C 2000::2:0/112 [0/0]
via ::, Ethernet1/2
L 2000::2:1/128 [0/0]
via ::, Ethernet1/2
C 2000::3:0/112 [0/0]
via ::, Ethernet1/3
L 2000::3:1/128 [0/0]
via ::, Ethernet1/3
C 2000::10:0/112 [0/0]
via ::, Ethernet1/0
L 2000::10:1/128 [0/0]
via ::, Ethernet1/0
OE2 2000::31:0/112 [110/5], tag 10
via FE80::CE01:7FF:FEEC:10, Ethernet1/0
OE2 2000::32:0/112 [110/5], tag 10
via FE80::CE01:7FF:FEEC:10, Ethernet1/0
OE2 2000::33:0/112 [110/5], tag 10
via FE80::CE01:7FF:FEEC:10, Ethernet1/0
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R1#
R2#show ipv6 route
IPv6 Routing Table - 12 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
O 2000::1:0/112 [110/20]
via FE80::CE00:7FF:FEEC:10, Ethernet1/0
O 2000::2:0/112 [110/20]
via FE80::CE00:7FF:FEEC:10, Ethernet1/0
O 2000::3:0/112 [110/20]
via FE80::CE00:7FF:FEEC:10, Ethernet1/0
C 2000::10:0/112 [0/0]
via ::, Ethernet1/0
L 2000::10:2/128 [0/0]
via ::, Ethernet1/0
C 2000::20:0/112 [0/0]
via ::, Ethernet1/1
L 2000::20:2/128 [0/0]
via ::, Ethernet1/1
R 2000::31:0/112 [120/2]
via FE80::CE02:7FF:FEEC:10, Ethernet1/1
R 2000::32:0/112 [120/2]
via FE80::CE02:7FF:FEEC:10, Ethernet1/1
R 2000::33:0/112 [120/2]
via FE80::CE02:7FF:FEEC:10, Ethernet1/1
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R2#
R3#show ipv6 route
IPv6 Routing Table - 13 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
R 2000::1:0/112 [120/6]
via FE80::CE01:7FF:FEEC:11, Ethernet1/0
R 2000::2:0/112 [120/6]
via FE80::CE01:7FF:FEEC:11, Ethernet1/0
R 2000::3:0/112 [120/6]
via FE80::CE01:7FF:FEEC:11, Ethernet1/0
C 2000::20:0/112 [0/0]
via ::, Ethernet1/0
L 2000::20:3/128 [0/0]
via ::, Ethernet1/0
C 2000::31:0/112 [0/0]
via ::, Ethernet1/1
L 2000::31:3/128 [0/0]
via ::, Ethernet1/1
C 2000::32:0/112 [0/0]
via ::, Ethernet1/2
L 2000::32:3/128 [0/0]
via ::, Ethernet1/2
C 2000::33:0/112 [0/0]
via ::, Ethernet1/3
L 2000::33:3/128 [0/0]
via ::, Ethernet1/3
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R3#
検証3 再配送の見直し
- 概要
R1は2000::20:0/112を、R3は2000::10:0/112を認識していません。この問題に対応するために、再配送の設定を見直します。
- 設定の修正
推測にしか過ぎませんが、再配送の仕様は以下のようになっているのかもしれません。
| 再配送 | 方法 |
|---|---|
| RIP -> OSPF | rip databaseをOSPFに再配送 |
| OSPF -> RIP | ospf databaseをRIPに再配送 |
| RIPng -> OSPFv3 | ルーティングテーブル上でRIPであるものをOSPFに再配送？（Connetedは再配送されない？） |
| OPSFv3 -> RIPng | ルーティングテーブル上でOSPFであるものをOSPFに再配送？（Connetedは再配送されない？） |
そこで、以下の設定を投入します。
R2(config)#interface Ethernet 1/1 R2(config-if)#ipv6 ospf 1 area 0 R2(config-if)#exit R2(config)#interface Ethernet 1/0 R2(config-if)#ipv6 rip HOGE enable
- ルーティングテーブルの確認
再配送の設定を見直した結果、R1上に2000::20:0/112が、R3上に2000::10:0/112が載りました。
R1#show ipv6 route
IPv6 Routing Table - 14 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
C 2000::1:0/112 [0/0]
via ::, Ethernet1/1
L 2000::1:1/128 [0/0]
via ::, Ethernet1/1
C 2000::2:0/112 [0/0]
via ::, Ethernet1/2
L 2000::2:1/128 [0/0]
via ::, Ethernet1/2
C 2000::3:0/112 [0/0]
via ::, Ethernet1/3
L 2000::3:1/128 [0/0]
via ::, Ethernet1/3
C 2000::10:0/112 [0/0]
via ::, Ethernet1/0
L 2000::10:1/128 [0/0]
via ::, Ethernet1/0
O 2000::20:0/112 [110/20] <- 新たに加わったR2 e1/1へのルート
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
OE2 2000::31:0/112 [110/5], tag 10
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
OE2 2000::32:0/112 [110/5], tag 10
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
OE2 2000::33:0/112 [110/5], tag 10
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R1#
R3#show ipv6 route
IPv6 Routing Table - 14 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
R 2000::1:0/112 [120/6]
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
R 2000::2:0/112 [120/6]
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
R 2000::3:0/112 [120/6]
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
R 2000::10:0/112 [120/2] <- 新たに加わったR2 e1/0へのルート
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
C 2000::20:0/112 [0/0]
via ::, Ethernet1/0
L 2000::20:3/128 [0/0]
via ::, Ethernet1/0
C 2000::31:0/112 [0/0]
via ::, Ethernet1/1
L 2000::31:3/128 [0/0]
via ::, Ethernet1/1
C 2000::32:0/112 [0/0]
via ::, Ethernet1/2
L 2000::32:3/128 [0/0]
via ::, Ethernet1/2
C 2000::33:0/112 [0/0]
via ::, Ethernet1/3
L 2000::33:3/128 [0/0]
via ::, Ethernet1/3
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R3#
検証4 経路集約
- OSPFの集約
OSPFに再配送されたルートを集約します。使用するコマンドはsummary-addressです。rangeコマンドはOSPFエリアをまたぐ時の集約の設定であるのに対し、summary-addressコマンドは再配送するルートを集約するコマンドです。
R2(config)#router ospf 1 R2(config-router)#summary-address 10.0.32.0 255.255.254.0 tag 10
ルートが集約された事を確認します。なお、tagはルーティングテーブル上からは確認できませんが、OSPF databaseからは確認する事ができます。
R1#show ip route
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 not set
10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
C 10.0.10.0/24 is directly connected, Ethernet1/0
C 10.0.2.0/24 is directly connected, Ethernet1/2
C 10.0.3.0/24 is directly connected, Ethernet1/3
C 10.0.1.0/24 is directly connected, Ethernet1/1
O E1 10.0.31.0/24 [110/60] via 10.0.10.2, 00:02:17, Ethernet1/0
O E1 10.0.20.0/24 [110/60] via 10.0.10.2, 00:02:45, Ethernet1/0
O E1 10.0.32.0/23 [110/60] via 10.0.10.2, 00:02:45, Ethernet1/0 <- 集約されたルート
R1#
R1#
R1#show ip ospf database
OSPF Router with ID (10.0.10.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.0.10.1 10.0.10.1 230 0x80000004 0x0090CF 4
10.0.20.2 10.0.20.2 226 0x80000003 0x00E1D8 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.0.10.1 10.0.10.1 230 0x80000001 0x0038A2
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
10.0.20.0 10.0.20.2 226 0x80000002 0x003D86 0
10.0.31.0 10.0.20.2 65 0x80000001 0x00C5F3 0
10.0.32.0 10.0.20.2 107 0x80000003 0x006647 10 <- 集約されたルート tagも確認できます
R1#
- OSPFv3の集約
OPSFv3の経路を集約します。設定方法はIPv4とほぼ同様です。
R2(config)#ipv6 router ospf 1 R2(config-rtr)#summary-prefix 2000::32:0/111 tag 20
ルーティングテーブルを見て、経路が集約された事を確認します。
R1#show ipv6 route
IPv6 Routing Table - 13 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
C 2000::1:0/112 [0/0]
via ::, Ethernet1/1
L 2000::1:1/128 [0/0]
via ::, Ethernet1/1
C 2000::2:0/112 [0/0]
via ::, Ethernet1/2
L 2000::2:1/128 [0/0]
via ::, Ethernet1/2
C 2000::3:0/112 [0/0]
via ::, Ethernet1/3
L 2000::3:1/128 [0/0]
via ::, Ethernet1/3
C 2000::10:0/112 [0/0]
via ::, Ethernet1/0
L 2000::10:1/128 [0/0]
via ::, Ethernet1/0
O 2000::20:0/112 [110/20]
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
OE2 2000::31:0/112 [110/5], tag 10
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
OE2 2000::32:0/111 [110/5], tag 20 <- 集約されたルート
via FE80::CE01:AFF:FEFC:10, Ethernet1/0
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R1#
- RIP, RIPngの集約
RIPとRIPngの集約を行います。また、RIPのバージョンがデフォルト(送信がv1, 受信がv1v2)になっているため、RIPもバージョンも変更します。
R2(config)#interface Ethernet 1/1 R2(config-if)#ip summary-address rip 10.0.0.0 255.255.252.0 R2(config-if)#ipv6 rip HOGE summary-address 2000::/110 R2(config)#router rip R2(config-router)#version 2
経路が集約された事を確認します。
R3#show ip route
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 not set
10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
R 10.0.10.0/24 [120/1] via 10.0.20.2, 00:00:26, Ethernet1/0
R 10.0.0.0/22 [120/6] via 10.0.20.2, 00:02:46, Ethernet1/0 <- 集約された経路
C 10.0.31.0/24 is directly connected, Ethernet1/1
C 10.0.20.0/24 is directly connected, Ethernet1/0
C 10.0.32.0/24 is directly connected, Ethernet1/2
R 10.0.32.0/23 [120/5] via 10.0.20.2, 00:02:46, Ethernet1/0
C 10.0.33.0/24 is directly connected, Ethernet1/3
R3#
R3#
R3#show ipv6 route
IPv6 Routing Table - 13 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D - EIGRP, EX - EIGRP external
R 2000::/110 [120/6] <- 集約された経路
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
R 2000::10:0/112 [120/2]
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
C 2000::20:0/112 [0/0]
via ::, Ethernet1/0
L 2000::20:3/128 [0/0]
via ::, Ethernet1/0
C 2000::31:0/112 [0/0]
via ::, Ethernet1/1
L 2000::31:3/128 [0/0]
via ::, Ethernet1/1
R 2000::32:0/111 [120/6]
via FE80::CE01:AFF:FEFC:11, Ethernet1/0
C 2000::32:0/112 [0/0]
via ::, Ethernet1/2
L 2000::32:3/128 [0/0]
via ::, Ethernet1/2
C 2000::33:0/112 [0/0]
via ::, Ethernet1/3
L 2000::33:3/128 [0/0]
via ::, Ethernet1/3
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
R3#
添付ファイル
