Router to Router Encrypting DLSw Traffic

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Updated:June 8, 2006

Document ID:14128

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Introduction

Prerequisites

Requirements

Components Used

Conventions

Configure

Network Diagram

Configurations

Verify

Troubleshoot

debug and show Commands

Related Information

Introduction

In the sample configuration in this document, there are two routers with data-link switching (DLSw) peers set up between their loopback interfaces. All DLSw traffic is encrypted between them. This configuration works for any self-generated traffic the router transmits.

In this configuration, the crypto access-list is generic. The user can be more specific and allow DLSw traffic between the two loopback addresses. In general, only DLSw traffic travels from loopback interface to loopback interface.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This configuration was developed and tested using these software and hardware versions:

Cisco IOS® Software Release 12.0. This configuration has been tested with 12.28T.
Cisco 2500-is56i-l.120-7.T
Cisco 2513

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Router A
Router B

Router A
Current configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname RouterA ! enable secret 5 $1$7WP3$aEqtNjvRJ9Vy6i41x0RJf0 enable password ww ! ip subnet-zero ! cns event-service server source-bridge ring-group 20 dlsw local-peer peer-id 1.1.1.1 dlsw remote-peer 0 tcp 2.2.2.2 ! crypto isakmp policy 1 hash md5 authentication pre-share crypto isakmp key cisco123 address 99.99.99.2 ! crypto ipsec transform-set dlswset esp-des esp-md5-hmac ! crypto map dlswstuff 10 ipsec-isakmp set peer 99.99.99.2 set transform-set dlswset match address 101 ! ! interface Loopback0 ip address 1.1.1.1 255.255.255.0 no ip directed-broadcast ! interface TokenRing0 ip address 10.2.2.3 255.255.255.0 ring-speed 16 source-bridge 2 3 20 source-bridge spanning no ip directed-broadcast no mop enabled ! interface Serial0 ip address 99.99.99.1 255.255.255.0 no ip directed-broadcast crypto map dlswstuff ! ip classless ip route 0.0.0.0 0.0.0.0 99.99.99.2 no ip http server ! access-list 101 permit ip host 1.1.1.1 host 2.2.2.2 ! line con 0 transport input none line aux 0 line vty 0 4 password ww login ! end

Router A

Current configuration:
 !
 version 12.0
 service timestamps debug uptime
 service timestamps log uptime
 no service password-encryption
 !
 hostname RouterA
 !
 enable secret 5 $1$7WP3$aEqtNjvRJ9Vy6i41x0RJf0
 enable password ww
 !
 ip subnet-zero
 !
 cns event-service server
 
 source-bridge ring-group 20
 dlsw local-peer peer-id 1.1.1.1
 dlsw remote-peer 0 tcp 2.2.2.2
 !
 crypto isakmp policy 1
  hash md5
  authentication pre-share
 crypto isakmp key cisco123 address 99.99.99.2
 !
 crypto ipsec transform-set dlswset esp-des esp-md5-hmac 
 !
 crypto map dlswstuff 10 ipsec-isakmp
  set peer 99.99.99.2
  set transform-set dlswset 
  match address 101
 !
 !
 interface Loopback0
  ip address 1.1.1.1 255.255.255.0
  no ip directed-broadcast
 !
 interface TokenRing0
  ip address 10.2.2.3 255.255.255.0
  ring-speed 16
  source-bridge 2 3 20
  source-bridge spanning
  no ip directed-broadcast
  no mop enabled
 !
 interface Serial0
  ip address 99.99.99.1 255.255.255.0
  no ip directed-broadcast
  crypto map dlswstuff
 !
 ip classless
 ip route 0.0.0.0 0.0.0.0 99.99.99.2
 no ip http server
 !
 access-list 101 permit ip host 1.1.1.1 host 2.2.2.2
 !
 line con 0
  transport input none
 line aux 0
 line vty 0 4
  password ww
  login
 !
 end

Router B
Current configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname RouterB ! enable secret 5 $1$7WP3$aEqtNjvRJ9Vy6i41x0RJf0 enable password ww ! ip subnet-zero ! cns event-service server source-bridge ring-group 10 dlsw local-peer peer-id 2.2.2.2 dlsw remote-peer 0 tcp 1.1.1.1 ! crypto isakmp policy 1 hash md5 authentication pre-share crypto isakmp key cisco123 address 99.99.99.1 ! crypto ipsec transform-set dlswset esp-des esp-md5-hmac ! crypto map dlswstuff 10 ipsec-isakmp set peer 99.99.99.1 set transform-set dlswset match address 101 ! ! interface Loopback0 ip address 2.2.2.2 255.255.255.0 no ip directed-broadcast ! interface TokenRing0 ip address 10.1.1.3 255.255.255.0 ring-speed 16 source-bridge 2 3 10 source-bridge spanning no ip directed-broadcast no mop enabled ! interface Serial0 ip address 99.99.99.2 255.255.255.0 no ip directed-broadcast crypto map dlswstuff ! ip classless ip route 0.0.0.0 0.0.0.0 99.99.99.1 no ip http server ! access-list 101 permit ip host 2.2.2.2 host 1.1.1.1 ! line con 0 transport input none line aux 0 line vty 0 4 password ww login ! end

Router B

Current configuration:
 !
 version 12.0
 service timestamps debug uptime
 service timestamps log uptime
 no service password-encryption
 !
 hostname RouterB
 !
 enable secret 5 $1$7WP3$aEqtNjvRJ9Vy6i41x0RJf0
 enable password ww
 !
 ip subnet-zero
 !
 cns event-service server
 
 source-bridge ring-group 10
 dlsw local-peer peer-id 2.2.2.2
 dlsw remote-peer 0 tcp 1.1.1.1
 !
 crypto isakmp policy 1
  hash md5
  authentication pre-share
 crypto isakmp key cisco123 address 99.99.99.1
 !
 crypto ipsec transform-set dlswset esp-des esp-md5-hmac 
 !
 crypto map dlswstuff 10 ipsec-isakmp
  set peer 99.99.99.1
  set transform-set dlswset 
  match address 101
 !
 !
 interface Loopback0
  ip address 2.2.2.2 255.255.255.0
  no ip directed-broadcast
 !
 interface TokenRing0
  ip address 10.1.1.3 255.255.255.0
  ring-speed 16
  source-bridge 2 3 10
  source-bridge spanning
  no ip directed-broadcast
  no mop enabled
 !
 interface Serial0
  ip address 99.99.99.2 255.255.255.0
  no ip directed-broadcast
  crypto map dlswstuff
 !
 ip classless
 ip route 0.0.0.0 0.0.0.0 99.99.99.1
 no ip http server
 !
 access-list 101 permit ip host 2.2.2.2 host 1.1.1.1
 !
 line con 0
  transport input none
 line aux 0
 line vty 0 4
  password ww
  login
 !
 end

debug crypto ipsec — This command displays the IP Security Protocol (IPSec) negotiations of Phase 2.
debug crypto isakmp — This command displays the Internet Security Association and Key Management Protocol (ISAKMP) negotiations of Phase 1.
debug crypto engine — This command displays the traffic that is encrypted.
show crypto ipsec sa — This displays the Phase 2 security associations.
show crypto isakmp sa — This command displays the Phase 1 security associations.
show dlsw peer — This command displays the DLSw peer status and the connect status.