Example: Configuring an IKE-based IPsec tunnel for IPv4 packets

As shown in Figure 118, establish an IPsec tunnel between Switch A and Switch B to protect data flows between them. Configure the IPsec tunnel as follows:

• Specify the encapsulation mode as tunnel, the security protocol as ESP, the encryption algorithm as AES-CBC-192, and the authentication algorithm as HMAC-SHA1.

• Set up SAs through IKE negotiation.

1. Configure Switch A:

   # Configure an IP address for VLAN-interface 1.

   <SwitchA> system-view
   [SwitchA] interface vlan-interface 1
   [SwitchA-Vlan-interface1] ip address 2.2.2.1 255.255.255.0
   [SwitchA-Vlan-interface1] quit
   

   # Configure an IPv4 advanced ACL to identify data flows from Switch A to Switch B.

   [SwitchA] acl number 3101
   [SwitchA-acl-adv-3101] rule 0 permit ip source 2.2.2.1 0 destination 2.2.3.1 0
   [SwitchA-acl-adv-3101] quit
   

   # Create an IPsec transform set named tran1.

   [SwitchA] ipsec transform-set tran1
   

   # Specify the encapsulation mode as tunnel.

   [SwitchA-ipsec-transform-set-tran1] encapsulation-mode tunnel
   

   # Specify the security protocol as ESP.

   [SwitchA-ipsec-transform-set-tran1] protocol esp
   

   # Specify the ESP encryption and authentication algorithms.

   [SwitchA-ipsec-transform-set-tran1] esp encryption-algorithm aes-cbc-192
   [SwitchA-ipsec-transform-set-tran1] esp authentication-algorithm sha1
   [SwitchA-ipsec-transform-set-tran1] quit
   

   # Create an IKE keychain named keychain1.

   [SwitchA] ike keychain keychain1
   

   # Specify 12345zxcvb!@#$%ZXCVB in plain text as the pre-shared key to be used with the remote peer at 2.2.3.1.

   [SwitchA-ike-keychain-keychain1] pre-shared-key address 2.2.3.1 255.255.255.0 key simple 12345zxcvb!@#$%ZXCVB
   [SwitchA-ike-keychain-keychain1] quit
   

   # Create and configure the IKE profile named profile1.

   [SwitchA] ike profile profile1
   [SwitchA-ike-profile-profile1] keychain keychain1
   [SwitchA-ike-profile-profile1] match remote identity address 2.2.3.1 255.255.255.0
   [SwitchA-ike-profile-profile1] quit
   

   # Create an IKE-based IPsec policy entry. Specify the policy name as map1 and set the sequence number to 10.

   [SwitchA] ipsec policy map1 10 isakmp
   

   # Apply ACL 3101.

   [SwitchA-ipsec-policy-isakmp-map1-10] security acl 3101
   

   # Apply IPsec transform set tran1.

   [SwitchA-ipsec-policy-isakmp-map1-10] transform-set tran1
   

   # Specify the local and remote IP addresses of the IPsec tunnel as 2.2.2.1 and 2.2.3.1.

   [SwitchA-ipsec-policy-isakmp-map1-10] local-address 2.2.2.1
   [SwitchA-ipsec-policy-isakmp-map1-10] remote-address 2.2.3.1
   

   # Apply IKE profile profile1.

   [SwitchA-ipsec-policy-isakmp-map1-10] ike-profile profile1
   [SwitchA-ipsec-policy-isakmp-map1-10] quit
   

   # Apply IPsec policy map1 to VLAN interface 1.

   [SwitchA] interface vlan-interface 1
   [SwitchA-Vlan-interface1] ipsec apply policy map1
   

2. Configure Switch B:

   # Configure an IP address for VLAN-interface 1.

   <SwitchB> system-view
   [SwitchB] interface vlan-interface 1
   [SwitchB-Vlan-interface1] ip address 2.2.3.1 255.255.255.0
   [SwitchB-Vlan-interface1] quit
   

   # Configure an IPv4 advanced ACL to identify data flows from Switch B to Switch A.

   [SwitchB] acl number 3101
   [SwitchB-acl-adv-3101] rule 0 permit ip source 2.2.3.1 0 destination 2.2.2.1 0
   [SwitchB-acl-adv-3101] quit
   

   # Create an IPsec transform set named tran1.

   [SwitchB] ipsec transform-set tran1
   

   # Specify the encapsulation mode as tunnel.

   [SwitchB-ipsec-transform-set-tran1] encapsulation-mode tunnel
   

   # Specify the security protocol as ESP.

   [SwitchB-ipsec-transform-set-tran1] protocol esp
   

   # Specify the ESP encryption and authentication algorithms.

   [SwitchB-ipsec-transform-set-tran1] esp encryption-algorithm aes-cbc-192
   [SwitchB-ipsec-transform-set-tran1] esp authentication-algorithm sha1
   [SwitchB-ipsec-transform-set-tran1] quit
   

   # Create an IKE keychain named keychain1.

   [SwitchB] ike keychain keychain1
   

   # Specify 12345zxcvb!@#$%ZXCVB in plain text as the pre-shared key to be used with the remote peer at 2.2.2.1.

   [SwitchB-ike-keychain-keychain1] pre-shared-key address 2.2.2.1 255.255.255.0 key simple 12345zxcvb!@#$%ZXCVB
   [SwitchB-ike-keychain-keychain1] quit
   

   # Create and configure the IKE profile named profile1.

   [SwitchB] ike profile profile1
   [SwitchB-ike-profile-profile1] keychain keychain1
   [SwitchB-ike-profile-profile1] match remote identity address 2.2.2.1 255.255.255.0
   [SwitchB-ike-profile-profile1] quit
   

   # Create an IKE-based IPsec policy entry. Specify the policy name as use1 and set the sequence number to 10.

   [SwitchB] ipsec policy use1 10 isakmp
   

   # Apply ACL 3101.

   [SwitchB-ipsec-policy-isakmp-use1-10] security acl 3101
   

   # Apply IPsec transform set tran1.

   [SwitchB-ipsec-policy-isakmp-use1-10] transform-set tran1
   

   # Specify the local and remote IP addresses of the IPsec tunnel as 2.2.3.1 and 2.2.2.1.

   [SwitchB-ipsec-policy-isakmp-use1-10] local-address 2.2.3.1
   [SwitchB-ipsec-policy-isakmp-use1-10] remote-address 2.2.2.1
   

   # Apply IKE profile profile1.

   [SwitchB-ipsec-policy-isakmp-use1-10] ike-profile profile1
   [SwitchB-ipsec-policy-isakmp-use1-10] quit
   

   # Apply IPsec policy use1 to VLAN-interface 1.

   [SwitchB] interface vlan-interface 1
   [SwitchB-Vlan-interface1] ipsec apply policy use1
   

# Initiate a connection between Switch A and Switch B to trigger IKE negotiation. After IPsec SAs are successfully negotiated by IKE, the traffic between the two switches is IPsec-protected.