EIGRP の Default-route を設定して下さい

概要

これは記述します Enhanced Interior Gateway Routing Protocol （EIGRP）のデフォルト ルートを設定する方法を文書化します。

前提条件

要件

EIGRP の基本的な知識。

使用するコンポーネント

このドキュメントは、特定のソフトウェアやハードウェアのバージョンに限定されるものではありません。

設定

この技術情報で説明される次のメソッドは EIGRP のデフォルト・ルートをアドバタイズして利用できます:

1. デフォルト ルートおよび再配布の使用。 

2. サマリー アドレスの使用。

ネットワーク図

設定

ここにルータ R1、R2 および R3 は EIGRP で設定され、EIGRP は R3 と R4 の間で動作していません。

R1 の設定

!
router eigrp 1 network 192.168.12.0
!

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

C 192.168.12.0/24 is directly connected, FastEthernet0/0
D 192.168.23.0/24 [90/30720] via 192.168.12.2, 00:10:27, FastEthernet0/0

R2 の設定

!router eigrp 1 network 192.168.12.0 network 192.168.23.0
!

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

C 192.168.12.0/24 is directly connected, FastEthernet0/0
C 192.168.23.0/24 is directly connected, FastEthernet0/1

R3 の設定

!router eigrp 1 network 192.168.23.0
!

R3#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
 a - application route
 + - replicated route, % - next hop override

Gateway of last resort is not set

D 192.168.12.0/24
 [90/28416] via 192.168.23.2, 00:05:16, GigabitEthernet0/0/1
 192.168.23.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.23.0/24 is directly connected, GigabitEthernet0/0/1
L 192.168.23.3/32 is directly connected, GigabitEthernet0/0/1
 192.168.34.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.34.0/24 is directly connected, Serial0/2/0
L 192.168.34.3/32 is directly connected, Serial0/2/0

デフォルト ルート及び再配布を使用する Method-1 

設定

この方式は静的デフォルト ルートを使用して EIGRP のデフォルト ルートをアドバタイズする方法を記述します。 

R3(config)#ip route 0.0.0.0 0.0.0.0 192.168.34.4

R3#show ip route Codes: L - local, 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, H - NHRP, l - LISP       a - application route       + - replicated route, % - next hop overrideGateway of last resort is 192.168.34.4 to network 0.0.0.0S*    0.0.0.0/0 [1/0] via 192.168.34.4D     192.168.12.0/24           [90/28416] via 192.168.23.2, 00:59:18, GigabitEthernet0/0/1      192.168.23.0/24 is variably subnetted, 2 subnets, 2 masksC        192.168.23.0/24 is directly connected, GigabitEthernet0/0/1L        192.168.23.3/32 is directly connected, GigabitEthernet0/0/1      192.168.34.0/24 is variably subnetted, 2 subnets, 2 masksC        192.168.34.0/24 is directly connected, Serial0/2/0L        192.168.34.3/32 is directly connected, Serial0/2/0

注: 直接接続されないので 0.0.0.0 をアドバタイズするのにこの場合 EIGRP の中でネットワークステートメントが使用することができません。

スタティック ルートの Redistriution は下記に示されているように EIGRP の下でされます:

R3(config)#router eigrp 1R3(config-router)#redistribute static metric 100000 1000 255 1 1500

検証

R1#show ip routeCodes: 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 routeGateway of last resort is 192.168.12.2 to network 0.0.0.0C    192.168.12.0/24 is directly connected, FastEthernet0/0D    192.168.23.0/24 [90/30720] via 192.168.12.2, 00:14:01, FastEthernet0/0D*EX 0.0.0.0/0 [170/286720] via 192.168.12.2, 00:00:39, FastEthernet0/0

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 routeGateway of last resort is 192.168.23.3 to network 0.0.0.0C    192.168.12.0/24 is directly connected, FastEthernet0/0C    192.168.23.0/24 is directly connected, FastEthernet0/1D*EX 0.0.0.0/0 [170/284160] via 192.168.23.3, 00:04:44, FastEthernet0/1

サマリー アドレスを使用する Method-2

設定

この方式は EIGRP の集約ルールを使用します。

!
R3(config)#interface gigabitEthernet 0/0/1R3(config-if)#ip summary-address eigrp 1 0.0.0.0 0.0.0.0
!

確認

R3#show ip routeCodes: L - local, 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, H - NHRP, l - LISP       a - application route       + - replicated route, % - next hop overrideGateway of last resort is 0.0.0.0 to network 0.0.0.0D*    0.0.0.0/0 is a summary, 00:00:06, Null0D     192.168.12.0/24           [90/28416] via 192.168.23.2, 00:15:54, GigabitEthernet0/0/1      192.168.23.0/24 is variably subnetted, 2 subnets, 2 masksC        192.168.23.0/24 is directly connected, GigabitEthernet0/0/1L        192.168.23.3/32 is directly connected, GigabitEthernet0/0/1      192.168.34.0/24 is variably subnetted, 2 subnets, 2 masksC        192.168.34.0/24 is directly connected, Serial0/2/0L        192.168.34.3/32 is directly connected, Serial0/2/0

R1 および R2 ルーティング テーブルは今 EIGRP から学習された defult ルートを示します

R1#show ip routeCodes: 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 routeGateway of last resort is 192.168.12.2 to network 0.0.0.0C    192.168.12.0/24 is directly connected, FastEthernet0/0D    192.168.23.0/24 [90/30720] via 192.168.12.2, 00:17:50, FastEthernet0/0D*   0.0.0.0/0 [90/30976] via 192.168.12.2, 00:01:30, FastEthernet0/0

R2#show ip routeCodes: 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 routeGateway of last resort is 192.168.23.3 to network 0.0.0.0C    192.168.12.0/24 is directly connected, FastEthernet0/0C    192.168.23.0/24 is directly connected, FastEthernet0/1D*   0.0.0.0/0 [90/28416] via 192.168.23.3, 00:03:50, FastEthernet0/1

トラブルシューティング

現在のところ、この設定に関する特定のトラブルシューティング情報はありません。