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# Configure the IKE peer.
[RouterA] ike peer peer
[RouterA-ike-peer-peer] pre-shared-key abcde
[RouterA-ike-peer-peer] remote-address 2.2.3.1
[RouterA-ike-peer-peer] quit
# Create an IPsec policy that uses IKE for IPsec SA negotiation.
[RouterA] ipsec policy map1 10 isakmp
# Apply the IPsec transform set.
[RouterA-ipsec-policy-isakmp-map1-10] transform-set tran1
# Apply the ACL.
[RouterA-ipsec-policy-isakmp-map1-10] security acl 3101
# Apply the IKE peer.
[RouterA-ipsec-policy-isakmp-map1-10] ike-peer peer
[RouterA-ipsec-policy-isakmp-map1-10] quit
# Configure the IP address of the serial interface.
[RouterA] interface serial 2/1
[RouterA-Serial2/1] ip address 2.2.2.1 255.255.255.0
# Apply the IPsec policy group to the interface.
[RouterA-Serial2/1] ipsec policy map1
[RouterA-Serial2/1] quit
# Enter encryption card interface view.
[RouterA] interface encrypt 5/1
# Bind the IPsec policy to the card and specify the card as the primary.
[RouterA-Encrypt5/1] ipsec binding policy map1 10 primary
[RouterA-Encrypt5/1] quit
# Enable the encryption engine.
[RouterA] cryptoengine enable
# Enable the IPsec module backup function.
[RouterA] ipsec cpu-backup enable
2. Configure Router B:
# Define an ACL to identify data flows from subnet 10.1.2.0/24 to subnet 10.1.1.0/24.
<RouterB> system-view
[RouterB] acl number 3101
[RouterB-acl-adv-3101] rule permit ip source 10.1.2.0 0.0.0.255 destination 10.1.1.0
0.0.0.255
[RouterB-acl-adv-3101] quit
# Configure a static route to Host A.
[RouterB] ip route-static 10.1.1.0 255.255.255.0 serial 2/2
# Create an IPsec transform set named tran1.
[RouterB] ipsec transform-set tran1
# Specify the encapsulation mode as tunnel.
[RouterB-ipsec-transform-set-tran1] encapsulation-mode tunnel
# Specify the security protocol as ESP.
[RouterB-ipsec-transform-set-tran1] transform esp
# Specify the algorithms.
[RouterB-ipsec-transform-set-tran1] esp encryption-algorithm des
[RouterB-ipsec-transform-set-tran1] esp authentication-algorithm sha1
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