ダイヤラウォッチを使用した ISDN 上の IPSec 冗長性設定

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Updated: 2008 年 1 月 14 日

Document ID:23100

偏向のない言語

この製品のドキュメントセットは、偏向のない言語を使用するように配慮されています。このドキュメントセットでの偏向のない言語とは、年齢、障害、性別、人種的アイデンティティ、民族的アイデンティティ、性的指向、社会経済的地位、およびインターセクショナリティに基づく差別を意味しない言語として定義されています。製品ソフトウェアのユーザインターフェイスにハードコードされている言語、RFP のドキュメントに基づいて使用されている言語、または参照されているサードパーティ製品で使用されている言語によりドキュメントに例外が存在する場合があります。シスコのインクルーシブランゲージの取り組みの詳細は、こちらをご覧ください。

翻訳について

シスコは世界中のユーザにそれぞれの言語でサポートコンテンツを提供するために、機械と人による翻訳を組み合わせて、本ドキュメントを翻訳しています。ただし、最高度の機械翻訳であっても、専門家による翻訳のような正確性は確保されません。シスコは、これら翻訳の正確性について法的責任を負いません。原典である英語版（リンクからアクセス可能）もあわせて参照することを推奨します。

内容

概要

前提条件

要件

使用するコンポーネント

表記法

設定

ネットワーク図

設定

確認

コマンド出力例

トラブルシュート

トラブルシューティングのためのコマンド

概要

このドキュメントでは、ルータ 1 の背後のネットワークからルータ 2 の背後のネットワークへのトラフィックを暗号化するための設定例を紹介します（この例では、ループバック 0 がネットワークとして使用されています）。ルータ 1 とルータ 2 の間のプライマリリンク（イーサネット）がダウンしても、IP セキュリティ（IPSec）トラフィックはセカンダリリンク（ISDN）を経由して流れ続けます。この目標を達成する方法は複数あります。ダイヤラウォッチ、バックアップインターフェイス、デマンド回線、およびフローティングスタティックを使用できます。この設定例では、ダイヤラウォッチのメカニズムについて説明します。その他の機能の詳細については、『DDR バックアップのためのバックアップインターフェイス、フローティングスタティックルート、ダイヤラウォッチの比較』を参照してください。

前提条件

要件

このドキュメントに特有の要件はありません。

使用するコンポーネント

このドキュメントの情報は、次のソフトウェアとハードウェアのバージョンに基づいています。

Cisco 2621 および 3640 ルータ
Cisco IOS® Software リリース 12.3（3）

このマニュアルの情報は、特定のラボ環境に置かれたデバイスに基づいて作成されました。このドキュメントで使用するすべてのデバイスは、初期（デフォルト）設定の状態から起動しています。ネットワークが実稼働中である場合は、コマンドを使用する前に、コマンドによる潜在的な影響について理解しておく必要があります。

表記法

ドキュメント表記の詳細は、「シスコテクニカルティップスの表記法」を参照してください。

設定

このセクションでは、このドキュメントで説明する機能を設定するために必要な情報を提供しています。

注：この文書で使用されているコマンドの詳細を調べるには、「Command Lookup ツール」を使用してください（登録ユーザのみ）。

ネットワーク図

このドキュメントでは次の図に示すネットワーク設定を例にあげています。

設定

このドキュメントで使用する設定を次に示します。

ルータ 1（2621）
ルータ 2（3640）

ルータ 1（2621）
r1#show running-config Building configuration... Current configuration : 2244 bytes ! version 12.3 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname r1 ! boot-start-marker boot-end-marker ! ! username r2 password 0 cisco !--- This is the username for remote router (Router 2) !--- and shared secret. Shared secret (used for Challenge Handshake !--- Authentication Protocol [CHAP]) must be the same on both sides. no aaa new-model ip subnet-zero ip tcp synwait-time 5 ! ! no ip domain lookup ! ip audit notify log ip audit po max-events 100 ip ssh break-string no ftp-server write-enable ! ! ! crypto isakmp policy 10 hash md5 authentication pre-share crypto isakmp key cisco address 222.222.222.222 ! ! crypto ipsec transform-set abc esp-des esp-md5-hmac ! crypto map cisco local-address Loopback1 crypto map cisco 10 ipsec-isakmp set peer 222.222.222.222 !--- Peer address, Loopback 1 of Router 2 set transform-set abc match address 101 !--- Networks to encrypt (Loopback 0 on both ends) ! isdn switch-type basic-ts013 ! ! ! ! ! ! ! ! ! no voice hpi capture buffer no voice hpi capture destination ! ! ! ! ! ! interface Loopback0 !--- Network to encrypt ip address 11.11.11.11 255.255.255.0 ! interface Loopback1 !--- Used for peer address for IPSec ip address 111.111.111.111 255.255.255.0 ! interface FastEthernet0/0 !--- Primary link ip address 10.1.1.1 255.255.255.0 no ip route-cache !--- Enable process switching no ip mroute-cache duplex auto speed auto crypto map cisco !--- Apply crypto map on primary interface ! interface BRI0/0 no ip address encapsulation ppp no ip route-cache no ip mroute-cache dialer pool-member 1 isdn switch-type basic-ts013 no cdp enable ! interface Dialer1 !--- Backup link ip address 20.1.1.1 255.255.255.0 encapsulation ppp no ip route-cache !--- Enable process switching ip ospf cost 9999 !--- Increase the cost so that when primary comes up again, !--- Open Shortest Path First (OSPF) routes are !--- preferred using the primary link (due to better cost). no ip mroute-cache dialer idle-timeout 180 dialer pool 1 dialer string 94134028 dialer watch-group 1 !--- Enable dialer watch on this backup interface. !--- Watch the route specified with the dialer watch-list 1* command.* dialer-group 1 !--- Apply interesting traffic defined in dialer list 1. no peer neighbor-route ppp authentication chap crypto map cisco !--- Apply crypto map on backup interface. ! router ospf 1 !--- OSPF advertising Loopback 0, Loopback 1, !--- primary, and secondary links. log-adjacency-changes network 10.1.1.0 0.0.0.255 area 0 network 11.11.11.0 0.0.0.255 area 0 network 20.1.1.0 0.0.0.255 area 0 network 111.111.111.0 0.0.0.255 area 0 ! ip http server no ip http secure-server ip classless ! ! access-list 101 permit ip host 11.11.11.11 host 22.22.22.22 !--- Access control list (ACL) 101 is the !--- IPSec traffic used in match address. access-list 110 deny ip any any !--- ACL 110 is for the dialer list to mark !--- all IP traffic uninteresting. The dialer watch will !--- trigger the ISDN backup when the route is lost. dialer watch-list 1 ip 222.222.222.222 255.255.255.255 !--- This defines the route(s) to be watched. !--- This exact route (including subnet mask) !--- must exist in the routing table. !--- Use the dialer watch-group 1 command to apply this !--- list to the backup interface. dialer watch-list 1 delay route-check initial 10 dialer-list 1 protocol ip list 110 !--- Interesting traffic is defined by ACL 110. !--- This is applied to Dialer1 using dialer group 1. ! ! ! dial-peer cor custom ! ! ! ! ! line con 0 exec-timeout 0 0 logging synchronous escape-character 27 line aux 0 line vty 0 4 login ! end

ルータ 1（2621）

r1#show running-config
Building configuration...
 
Current configuration : 2244 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname r1
!
boot-start-marker
boot-end-marker
!
!
username r2 password 0 cisco

!--- This is the username for remote router (Router 2) !--- and shared secret. Shared secret (used for Challenge Handshake !--- Authentication Protocol [CHAP]) must be the same on both sides.

no aaa new-model
ip subnet-zero
ip tcp synwait-time 5
!
!
no ip domain lookup
!
ip audit notify log
ip audit po max-events 100
ip ssh break-string
no ftp-server write-enable
!
!
!
crypto isakmp policy 10
 hash md5
 authentication pre-share
crypto isakmp key cisco address 222.222.222.222
!
!
  crypto ipsec transform-set abc esp-des esp-md5-hmac
!
crypto map cisco local-address Loopback1
crypto map cisco 10 ipsec-isakmp
 set peer 222.222.222.222

!--- Peer address, Loopback 1 of Router 2

 set transform-set abc
 match address 101

!--- Networks to encrypt (Loopback 0 on both ends)

!
isdn switch-type basic-ts013
!
!
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
!
!
!
!
interface Loopback0

!--- Network to encrypt

 ip address 11.11.11.11 255.255.255.0
!
interface Loopback1

!--- Used for peer address for IPSec

 ip address 111.111.111.111 255.255.255.0
!
interface FastEthernet0/0

!--- Primary link

 ip address 10.1.1.1 255.255.255.0
 no ip route-cache

!--- Enable process switching

 no ip mroute-cache
 duplex auto
 speed auto
 crypto map cisco

!--- Apply crypto map on primary interface

!
interface BRI0/0
 no ip address
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 dialer pool-member 1
 isdn switch-type basic-ts013
 no cdp enable
!
interface Dialer1

!--- Backup link

 ip address 20.1.1.1 255.255.255.0
 encapsulation ppp
 no ip route-cache

!--- Enable process switching

ip ospf cost 9999

!--- Increase the cost so that when primary comes up again, !--- Open Shortest Path First (OSPF) routes are !--- preferred using the primary link (due to better cost).

no ip mroute-cache
 dialer idle-timeout 180
 dialer pool 1
 dialer string 94134028
dialer watch-group 1

!--- Enable dialer watch on this backup interface. !--- Watch the route specified with the dialer watch-list 1 command.

 dialer-group 1

!--- Apply interesting traffic defined in dialer list 1.

 no peer neighbor-route
 ppp authentication chap
 crypto map cisco

!--- Apply crypto map on backup interface.

!
router ospf 1

!--- OSPF advertising Loopback 0, Loopback 1, !--- primary, and secondary links.

 log-adjacency-changes
 network 10.1.1.0 0.0.0.255 area 0
 network 11.11.11.0 0.0.0.255 area 0
 network 20.1.1.0 0.0.0.255 area 0
 network 111.111.111.0 0.0.0.255 area 0
!
ip http server
no ip http secure-server
ip classless
!
!
access-list 101 permit ip host 11.11.11.11 host 22.22.22.22

!--- Access control list (ACL) 101 is the !--- IPSec traffic used in match address.

access-list 110 deny   ip any any

!--- ACL 110 is for the dialer list to mark !--- all IP traffic uninteresting. The dialer watch will !--- trigger the ISDN backup when the route is lost.

dialer watch-list 1 ip 222.222.222.222 255.255.255.255

!--- This defines the route(s) to be watched. !--- This exact route (including subnet mask) !--- must exist in the routing table. !--- Use the dialer watch-group 1 command to apply this !--- list to the backup interface.

dialer watch-list 1 delay route-check initial 10
dialer-list 1 protocol ip list 110

!--- Interesting traffic is defined by ACL 110. !--- This is applied to Dialer1 using dialer group 1.

!
!
!
dial-peer cor custom
!
!
!
!
!
line con 0
 exec-timeout 0 0
 logging synchronous
 escape-character 27
line aux 0
line vty 0 4
 login
!
end

ルータ 2（3640）
r2#show running-config Building configuration... Current configuration : 2311 bytes ! 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 ! username r1 password 0 cisco !--- This is the username for remote router (Router 1) !--- and shared secret. Shared secret (used for CHAP) !--- must be the same on both sides. no aaa new-model ip subnet-zero ip tcp synwait-time 5 ! ! no ip domain lookup ! ip audit notify log ip audit po max-events 100 ip ssh break-string no ftp-server write-enable ! ! ! crypto isakmp policy 10 hash md5 authentication pre-share crypto isakmp key cisco address 111.111.111.111 ! ! crypto ipsec transform-set abc esp-des esp-md5-hmac ! ! crypto map cisco local-address Loopback1 crypto map cisco 10 ipsec-isakmp set peer 111.111.111.111 !--- Peer address, Loopback 1 of Router 1 set transform-set abc match address 101 !--- Networks to encrypt (Loopback 0 on both ends) ! isdn switch-type basic-ts013 ! ! ! ! ! ! ! ! ! no voice hpi capture buffer no voice hpi capture destination ! ! ! ! ! ! interface Loopback0 ip address 22.22.22.22 255.255.255.0 !--- Network to encrypt ! interface Loopback1 ip address 222.222.222.222 255.255.255.0 !--- Used for peer address for IPSec. ! interface BRI0/0 no ip address encapsulation ppp no ip route-cache no ip mroute-cache dialer pool-member 1 isdn switch-type basic-ts013 ! interface Ethernet0/0 !--- Primary link ip address 10.1.1.2 255.255.255.0 no ip route-cache !--- Enable process switching. no ip mroute-cache half-duplex crypto map cisco !--- Apply crypto map on primary interface. ! interface Dialer1 ip address 20.1.1.2 255.255.255.0 encapsulation ppp no ip route-cache ip ospf cost 9999 no ip mroute-cache dialer pool 1 dialer idle-timeout 600 dialer remote-name r1 !--- Dialer for the BRI interface of the remote router !--- without a dial string. dialer-group 1 !--- Apply interesting traffic defined in dialer list 1. ppp authentication chap crypto map cisco !--- Apply crypto map on backup interface. ! router ospf 1 log-adjacency-changes network 10.1.1.0 0.0.0.255 area 0 network 20.1.1.0 0.0.0.255 area 0 network 22.22.22.0 0.0.0.255 area 0 network 222.222.222.0 0.0.0.255 area 0 ! no ip http server no ip http secure-server ip classless ! ! access-list 101 permit ip host 22.22.22.22 host 11.11.11.11 access-list 110 deny ospf any any !--- Mark OSPF as uninteresting. !--- This will not allow OSPF hellos !--- to try to bring the link up. access-list 110 permit ip any any dialer-list 1 protocol ip list 110 !--- Interesting traffic is defined by ACL 110. !--- This is applied to Dialer1 using dialer group 1. ! line con 0 exec-timeout 0 0 logging synchronous escape-character 27 line aux 0 line vty 0 4 login ! end

ルータ 2（3640）

r2#show running-config
Building configuration...
 
Current configuration : 2311 bytes
!
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
!
username r1 password 0 cisco

!--- This is the username for remote router (Router 1) !--- and shared secret. Shared secret (used for CHAP) !--- must be the same on both sides.

no aaa new-model
ip subnet-zero
ip tcp synwait-time 5
!
!
no ip domain lookup
!
ip audit notify log
ip audit po max-events 100
ip ssh break-string
no ftp-server write-enable
!
!
!
crypto isakmp policy 10
 hash md5
 authentication pre-share
crypto isakmp key cisco address 111.111.111.111
!
!
  crypto ipsec transform-set abc esp-des esp-md5-hmac
!
!
crypto map cisco local-address Loopback1
crypto map cisco 10 ipsec-isakmp
 set peer 111.111.111.111

!--- Peer address, Loopback 1 of Router 1

 set transform-set abc
 match address 101

!--- Networks to encrypt (Loopback 0 on both ends)

!
isdn switch-type basic-ts013
!
!
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
!
!
!
!
interface Loopback0
 ip address 22.22.22.22 255.255.255.0

!--- Network to encrypt

!
interface Loopback1
 ip address 222.222.222.222 255.255.255.0

!--- Used for peer address for IPSec.

!
interface BRI0/0
 no ip address
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 dialer pool-member 1
 isdn switch-type basic-ts013
!
interface Ethernet0/0

!--- Primary link

 ip address 10.1.1.2 255.255.255.0
 no ip route-cache

!--- Enable process switching.

 no ip mroute-cache
 half-duplex
 crypto map cisco

!--- Apply crypto map on primary interface.

!
interface Dialer1
 ip address 20.1.1.2 255.255.255.0
 encapsulation ppp
 no ip route-cache
 ip ospf cost 9999
 no ip mroute-cache
 dialer pool 1
 dialer idle-timeout 600
 dialer remote-name r1

!--- Dialer for the BRI interface of the remote router !--- without a dial string.

 dialer-group 1

!--- Apply interesting traffic defined in dialer list 1.

 ppp authentication chap
 crypto map cisco

!--- Apply crypto map on backup interface.

!
router ospf 1
 log-adjacency-changes
 network 10.1.1.0 0.0.0.255 area 0
 network 20.1.1.0 0.0.0.255 area 0
 network 22.22.22.0 0.0.0.255 area 0
 network 222.222.222.0 0.0.0.255 area 0
!
no ip http server
no ip http secure-server
ip classless
!
!
access-list 101 permit ip host 22.22.22.22 host 11.11.11.11
access-list 110 deny   ospf any any

!--- Mark OSPF as uninteresting. !--- This will not allow OSPF hellos !--- to try to bring the link up.

access-list 110 permit ip any any
dialer-list 1 protocol ip list 110

!--- Interesting traffic is defined by ACL 110. !--- This is applied to Dialer1 using dialer group 1.

!
line con 0
 exec-timeout 0 0
 logging synchronous
 escape-character 27
line aux 0
line vty 0 4
 login
!
end

確認

このセクションでは、設定が正常に機能するかどうかを確認する際に役立つ情報を示しています。

コマンド出力例

一部の show コマンドはアウトプットインタープリタツールによってサポートされています（登録ユーザ専用）。このツールを使用することによって、show コマンド出力の分析結果を表示できます。

ルータ 1（2621）のルーティングテーブル：プライマリリンクのアップ

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
 
     222.222.222.0/32 is subnetted, 1 subnets
O       222.222.222.222 [110/2] via 10.1.1.2, 00:00:25, FastEthernet0/0
      20.0.0.0/24 is subnetted, 1 subnets
C       20.1.1.0 is directly connected, Dialer1
     22.0.0.0/32 is subnetted, 1 subnets
O       22.22.22.22 [110/2] via 10.1.1.2, 00:00:25, FastEthernet0/0
     111.0.0.0/24 is subnetted, 1 subnets
C       111.111.111.0 is directly connected, Loopback1
     10.0.0.0/24 is subnetted, 1 subnets
C       10.1.1.0 is directly connected, FastEthernet0/0
     11.0.0.0/24 is subnetted, 1 subnets
C       11.11.11.0 is directly connected, Loopback0

ルータ 2（3640）のルーティングテーブル：プライマリリンクのアップ

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    222.222.222.0/24 is directly connected, Loopback1
     20.0.0.0/24 is subnetted, 1 subnets
C       20.1.1.0 is directly connected, Dialer1
     22.0.0.0/24 is subnetted, 1 subnets
C       22.22.22.0 is directly connected, Loopback0
     111.0.0.0/32 is subnetted, 1 subnets
O       111.111.111.111 [110/11] via 10.1.1.1, 00:06:22, Ethernet0/0
     10.0.0.0/24 is subnetted, 1 subnets
C       10.1.1.0 is directly connected, Ethernet0/0
     11.0.0.0/32 is subnetted, 1 subnets
O       11.11.11.11 [110/11] via 10.1.1.1, 00:06:23, Ethernet0/0

ルータ 1（2621）の OSPF 隣接ルータ：プライマリリンクのアップ

r1#show ip ospf neighbor
Neighbor ID     Pri   State      Dead Time   Address    Interface
222.222.222.222   1   FULL/DR    00:00:33    10.1.1.2   FastEthernet0/0

ルータ 2（3640）の OSPF 隣接ルータ：プライマリリンクのアップ

r2#show ip ospf neighbor
Neighbor ID     Pri   State      Dead Time   Address    Interface
111.111.111.111   1   FULL/BDR   00:00:31    10.1.1.1   Ethernet0/0

ルータ 1（2621）のルーティングテーブル：プライマリリンクのダウン

r1#show 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.
 
     222.222.222.0/32 is subnetted, 1 subnets
O       222.222.222.222 [110/10000] via 20.1.1.2, 00:00:09, Dialer1
     20.0.0.0/24 is subnetted, 1 subnets
C       20.1.1.0 is directly connected, BRI0/0
     20.0.0.0/24 is subnetted, 1 subnets
C       20.1.1.0 is directly connected, Dialer1
     22.0.0.0/32 is subnetted, 1 subnets
O       22.22.22.22 [110/10000] via 20.1.1.2, 00:00:09, Dialer1
     111.0.0.0/24 is subnetted, 1 subnets
C       111.111.111.0 is directly connected, Loopback1
     10.0.0.0/24 is subnetted, 1 subnets
O       10.1.1.0 [110/10009] via 20.1.1.2, 00:00:09, Dialer1
     11.0.0.0/24 is subnetted, 1 subnets
C       11.11.11.0 is directly connected, Loopback0

ルータ 2（3640）のルーティングテーブル：プライマリリンクのダウン

r2#show 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.
 
C    222.222.222.0/24 is directly connected, Loopback1
     20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       20.1.1.0/24 is directly connected, Dialer1
C       20.1.1.1/32 is directly connected, Dialer1
     22.0.0.0/24 is subnetted, 1 subnets
C       22.22.22.0 is directly connected, Loopback0
     111.0.0.0/32 is subnetted, 1 subnets
O       111.111.111.111 [110/10000] via 20.1.1.1, 00:00:07, Dialer1
     10.0.0.0/24 is subnetted, 1 subnets
C       10.1.1.0 is directly connected, Ethernet0/0
     11.0.0.0/32 is subnetted, 1 subnets
O       11.11.11.11 [110/10000] via 20.1.1.1, 00:00:08, Dialer1

ルータ 1（2621）の OSPF 隣接ルータ：プライマリリンクのダウン

r1#show ip ospf neighbor
Neighbor ID     Pri   State      Dead Time   Address     Interface
222.222.222.222   0   FULL/  -   00:00:32    20.1.1.2    Dialer1

ルータ 2（3640）の OSPF 隣接ルータ：プライマリリンクのダウン

r2#show ip ospf neighbor
Neighbor ID     Pri   State      Dead Time   Address     Interface
111.111.111.111   0   FULL/  -   00:00:31    20.1.1.1    Dialer1

debug dialer と以下に示す複数の show コマンドの出力には、プライマリリンクの障害と、喪失ルートを認識したダイヤラウォッチが示されています。次にルータはバックアップリンクを起動し、OSPF はセカンダリリンクを介して収束します。アイドルタイムアウトが満了するたび、ルータはプライマリリンクがダウンしているかどうかチェックします。プライマリリンクがアップしていることが確認されると、ディセーブルタイマーが満了し、コールが切断された後、ダイアラウォッチはバックアップリンクを接続解除し、OSPF は通常と同じプライマリリンク経由に収束します。

プライマリリンクがダウンして再度アップした場合の、ルータ 1（2621）の debug および show コマンド出力を以下に示します。

r1#show debug
Dial on demand:
  Dial on demand events debugging is on

r1#
03:00:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, 
   changed state to down

!--- Primary link was brought down manually when you disable the switch ports.

03:00:21: %OSPF-5-ADJCHG: Process 1, Nbr 222.222.222.222 on FastEthernet0/0
   from FULL to DOWN, Neighbor Down: Interface down or detached

!--- Primary link goes down. !--- OSPF loses neighbor adjacency.

r1#

!--- Dialer watch kicks in.

03:00:21: DDR: Dialer Watch: watch-group = 1
03:00:21: DDR:    network 222.222.222.222/255.255.255.255 DOWN,
03:00:21: DDR:    primary DOWN
03:00:21: DDR: Dialer Watch: Dial Reason: Primary of group 1 DOWN
03:00:21: DDR: Dialer Watch: watch-group = 1, 
03:00:21: BR0/0 DDR: rotor dialout [best] 
   least recent failure is also most recent failure
03:00:21: BR0/0 DDR: rotor dialout [best] also has most recent failure
03:00:21: BR0/0 DDR: rotor dialout [best]
03:00:21: DDR:    dialing secondary by dialer string 94134028 on Di1
03:00:21: BR0/0 DDR: Attempting to dial 94134028
03:00:21: DDR: Dialer Watch: watch-group = 1
r1#
03:00:21: DDR:    network 222.222.222.222/255.255.255.255 DOWN,
03:00:21: DDR:    primary DOWN
03:00:21: DDR: Dialer Watch: Dial Reason: Secondary of group 1 AVAILABLE
03:00:21: DDR: Dialer Watch: watch-group = 1, 
03:00:21: DDR: Dialer Watch: watch-group = 1
03:00:21: DDR:    network 222.222.222.222/255.255.255.255 DOWN,
03:00:21: DDR:    primary DOWN
03:00:21: DDR: Dialer Watch: Dial Reason: Secondary of group 1 AVAILABLE
03:00:21: DDR: Dialer Watch: watch-group = 1, 
03:00:21: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0, TEI 82 changed to up
03:00:94489280514: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to up
03:00:94489280516: BR0/0:1 DDR: Dialer Watch: resetting call in progress
03:00:94489280512: BR0/0:1: interface must be fifo queue, force fifo
03:00:94489280512: %DIALER-6-BIND: Interface BR0/0:1 bound to profile Di1
r1#
03:00:22: BR0/0:1 DDR: Remote name for r2
03:00:22: BR0/0:1 DDR: dialer protocol up
03:00:23: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0:1, 
   changed state to up
r1#
03:00:28: %ISDN-6-CONNECT: Interface BRI0/0:1 is now connected to 94134028 r2

!--- Backup link is now connected to Router 2.

r1#
03:00:31: %OSPF-5-ADJCHG: Process 1, Nbr 222.222.222.222 on Dialer1 
   from LOADING to FULL, Loading Done

!--- OSPF converges over the backup link.

r1#
r1#show dialer
 
BRI0/0 - dialer type = ISDN
 
Dial String   Successes   Failures   Last DNIS   Last status
0 incoming call(s) have been screened.
0 incoming call(s) rejected for callback.
 
BRI0/0:1 - dialer type = ISDN
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Dial reason: Dialing on watched route loss

!--- Dial reason is the lost route.

Interface bound to profile Di1
Time until disconnect 154 secs

!--- Idle timeout is ticking.

Current call connected 00:00:25
Connected to 94134028 (r2)
 
BRI0/0:2 - dialer type = ISDN
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle
 
Di1 - dialer type = DIALER PROFILE
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Number of active calls = 1
 
Dial String      Successes   Failures    Last DNIS   Last status
94134028                45         24    00:00:27       successful   Default
r1#show isdn active
-----------------------------------------------------------------------------
                                ISDN ACTIVE CALLS
-----------------------------------------------------------------------------
Call    Calling     Called     Remote  Seconds Seconds Seconds Charges
Type    Number      Number     Name    Used    Left    Idle    Units/Currency
-----------------------------------------------------------------------------
Out   ---N/A---   94134028         r2       37     142      37      0        
-----------------------------------------------------------------------------
r1#show dialer
 
BRI0/0 - dialer type = ISDN
 
Dial String      Successes   Failures    Last DNIS   Last status
0 incoming call(s) have been screened.
0 incoming call(s) rejected for callback.
 
BRI0/0:1 - dialer type = ISDN
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Dial reason: Dialing on watched route loss
Interface bound to profile Di1
Time until disconnect 47 secs

!--- Idle timeout is ticking.

Current call connected 00:02:12
Connected to 94134028 (r2)
 
BRI0/0:2 - dialer type = ISDN
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle
 
Di1 - dialer type = DIALER PROFILE
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Number of active calls = 1
 
Dial String   Successes   Failures   Last DNIS   Last status
94134028             45         24   00:02:14    successful   Default
r1#show dialer
 
BRI0/0 - dialer type = ISDN
 
Dial String      Successes   Failures    Last DNIS   Last status
0 incoming call(s) have been screened.
0 incoming call(s) rejected for callback.
 
BRI0/0:1 - dialer type = ISDN
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Dial reason: Dialing on watched route loss
Interface bound to profile Di1
Time until disconnect 0 secs

!--- Idle timeout is ticking.

Current call connected 00:02:59
Connected to 94134028 (r2)
 
BRI0/0:2 - dialer type = ISDN
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle
 
Di1 - dialer type = DIALER PROFILE
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Number of active calls = 1
 
Dial String   Successes   Failures   Last DNIS   Last status
94134028             45         24   00:03:05    successful   Default
r1#
03:03:22: BR0/0:1 DDR: idle timeout

!--- Idle timed out. !--- Dialer watch checks lost routes !--- again and reset the idle time since primary is not up yet.

03:03:22: DDR: Dialer Watch: watch-group = 1
03:03:22: DDR:    network 222.222.222.222/255.255.255.255 UP,
03:03:22: DDR:    primary DOWN

!--- Primary link is still down.

r1#
r1#show dialer
 
BRI0/0 - dialer type = ISDN
 
Dial String    Successes   Failures    Last DNIS   Last status
0 incoming call(s) have been screened.
0 incoming call(s) rejected for callback.
 
BRI0/0:1 - dialer type = ISDN
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Dial reason: Dialing on watched route loss
Interface bound to profile Di1
Time until disconnect 154 secs

!--- Idle timeout was reset by dialer watch.

Current call connected 00:03:25
Connected to 94134028 (r2)
 
BRI0/0:2 - dialer type = ISDN
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle
 
Di1 - dialer type = DIALER PROFILE
Idle timer (180 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Number of active calls = 1
 
Dial String   Successes   Failures   Last DNIS   Last status
94134028             45         24   00:03:28    successful   Default
r1#
03:04:59: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0,
   changed state to up

!--- Primary link was brought up manually when the switch ports are enabled.

r1#
r1#
03:05:50: %OSPF-5-ADJCHG: Process 1, Nbr 222.222.222.222 on FastEthernet0/0
   from LOADING to FULL, Loading Done
r1#
r1#show ip ospf neigh
 
Neighbor ID     Pri   State      Dead Time   Address     Interface
222.222.222.222   0   FULL/  -   00:00:02    20.1.1.2    Dialer1

!--- OSPF over secondary link is still up because !--- the call is not terminated yet, waiting for idle timeout.

222.222.222.222   1   FULL/DR    00:00:38    10.1.1.2    FastEthernet0/0

!--- OSPF is now starts to converge over primary link.

r1#
r1#show ip route 222.222.222.222

!--- The watched route is now learned through the primary link. !--- Check the cost.

Routing entry for 222.222.222.222/32
  Known via "ospf 1", distance 110, metric 2, type intra area
  Last update from 10.1.1.2 on FastEthernet0/0, 00:00:16 ago
  Routing Descriptor Blocks:
  * 10.1.1.2, from 222.222.222.222, 00:00:16 ago, via FastEthernet0/0
      Route metric is 2, traffic share count is
r1#
03:06:22: BR0/0:1 DDR: idle timeout

!--- Idle timed out. !--- Dialer watch checks lost routes. Since primary is up, !--- it tears down the call.

03:06:22: DDR: Dialer Watch: watch-group = 1
03:06:22: DDR:    network 222.222.222.222/255.255.255.255 UP,
03:06:22: DDR:    primary UP
03:06:22: BR0/0:1 DDR: disconnecting call
03:06:22: BR0/0:1 DDR: Dialer Watch: resetting call in progress
03:06:22: DDR: Dialer Watch: watch-group = 1
03:06:22: DDR:    network 222.222.222.222/255.255.255.255 UP,
03:06:22: DDR:    primary UP
03:06:22: %ISDN-6-DISCONNECT: Interface BRI0/0:1  
   disconnected from 94134028 r2,
   call lasted 360 seconds
03:06:96677768412: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down
03:06:94489281195: BR0/0 DDR: has total 0 call(s), dial_out 0, dial_in 0
r1#
03:06:94489280544: %DIALER-6-UNBIND: Interface BR0/0:1 
   unbound from profile Di1
03:06:23: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0:1,
   changed state to down
r1#
03:06:37: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0, 
   TEI 82 changed to down
r1#
03:07:01: %OSPF-5-ADJCHG: Process 1, Nbr 222.222.222.222 on Dialer1 
   from FULL to DOWN, Neighbor Down: Dead timer expired

!--- OSPF neighbor is down because the secondary link is down. !--- Dead timer has expired.

r1#
r1#show ip ospf neigh
 
Neighbor ID     Pri   State       Dead Time   Address     Interface
222.222.222.222   1   FULL/DR     00:00:38    10.1.1.2    FastEthernet0/0

!--- OSPF neighbor is through the primary link only.

r1#u all
All possible debugging has been turned off
r1#

トラブルシュート

ここでは、設定のトラブルシューティングに使用できる情報を示します。ISDN レイヤ 1、2 および 3 に関する一般的な問題のトラブルシューティングについては、「show isdn status コマンドを使用した BRI のトラブルシューティング」を参照してください。

トラブルシューティングのためのコマンド

注：debugコマンドを発行する前に、『debugコマンドの重要な情報』を参照してください。

以下の debug コマンドは、両方の IPSec ピアで実行できます。

debug crypto isakmp：フェーズ 1 のエラーを表示します。
debug crypto ipsec：フェーズ 2 のエラーを表示します。
debug crypto engine：暗号エンジンからの情報を表示します。

以下の show コマンドは、両方の IPSec ピアで実行できます。

show crypto isakmp sa：ピアにおける現在の Internet Key Exchange（IKE; インターネット鍵交換）Security Association（SA; セキュリティアソシエーション）をすべて表示します。
show crypto ipsec sa：現在の [IPSec] SA が使用している設定を表示します。
show crypto engine connections active：現在の接続と、暗号パケットと暗号解除パケットに関する情報を表示します。

以下の clear コマンドは、SA のクリアに使用できます。

clear crypto isakmp：フェーズ1のセキュリティアソシエーションをクリアします。
clear crypto sa：フェーズ2のセキュリティアソシエーションをクリアします。

ダイヤラウォッチを使用した ISDN 上の IPSec 冗長性設定

ダウンロードオプション

偏向のない言語

翻訳について

内容

概要

前提条件

要件

使用するコンポーネント

表記法

設定

ネットワーク図

設定

確認

コマンド出力例

トラブルシュート

トラブルシューティングのためのコマンド

関連情報

更新履歴

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シスコに問い合わせ

ダイヤラ ウォッチを使用した ISDN 上の IPSec 冗長性設定

ダウンロード オプション

偏向のない言語

翻訳について

内容

更新履歴

このドキュメントは役に立ちましたか?

シスコに問い合わせ

ダイヤラウォッチを使用した ISDN 上の IPSec 冗長性設定

ダウンロードオプション