when you run "show crypto engine connections active" you will see an entry in the last with connection ID 1001, type is IKE, algorithm SHA-3DES, it shows the parameters that are negotiated for phase 1 tunnel with the peer 10.1.1.1.This Conn-id is also reflected when you run "Show crypto isakmp sa". whereas conn-id 1 and 2 represent phase 2 parameters negotiated . these id you can see under "show crypto ipsec sa" when you see outbound/inbound esp sas to verify.
Crypto Engine Connections
ID Interface Type Algorithm Encrypt Decrypt IP-Address 1 Fa0/0 IPsec 3DES+SHA 0 9 10.1.1.1 2 Fa0/0 IPsec 3DES+SHA 9 0 10.1.1.1 1001 Fa0/0 IKE SHA+3DES 0 0 10.1.1.1
Internet Security Association and Key Management Protocol (ISAKMP) is a protocol defined by RFC 2408 for establishing security association (SA) and cryptographic keys in an Internet environment.
https://en.wikipedia.org › wiki › Internet_Security_Associatio...
sa` for Phase 1 and `show crypto ipsec sa` for Phase 2 to check the status of the tunnel's phases on a Cisco device. Checking the status of an IPSec VPN tunnel involves two phases, Phase 1 (IKE or ISAKMP) and Phase 2 (IPSec).
In Phase 1 negotiations, the two VPN gateway devices exchange credentials. The devices identify each other and negotiate to find a common set of Phase 1 settings to use. When Phase 1 negotiations are completed, the two devices have a Phase 1 Security Association (SA).
On a Cisco router, the show ip route command is used to display the IPv4 routing table of a router. A router provides additional route information, including how the route was learned, how long the route has been in the table, and which specific interface to use to get to a predefined destination.
To verify that your VPN tunnel is working properly, it is necessary to ping the IP address of a computer on the remote network. By pinging the remote network, you send data packets to the remote network and the remote network replies that it has received the data packets.
To view status information about active IPsec tunnels, use the show ipsec tunnel command. This command prints status output for all IPsec tunnels, and it also supports printing tunnel information individually by providing the tunnel ID.
The show interface tunnel < Tunnel-ID-List > command displays the tunnel information with supported fields. Unsupported fields are indicated with n/a .
Use the command `show crypto isakmp sa` on a Cisco device. This command displays the current IKE Security Associations (SAs) built between your device and the peer. A state of “QM_IDLE” indicates a successful Phase 1.
The first phase in IKEv2 is IKE_SA, consisting of the message pair IKE_SA_INIT. The attributes of the IKE_SA phase are defined in the Key Exchange Policy. The second phase in IKEv2 is CHILD_SA. The first CHILD_SA is the IKE_AUTH message pair.
The ASAs will exchange secret keys, they authenticate each other and will negotiate about the IKE security policies. This is what happens in phase 1: Authenticate and protect the identities of the IPsec peers. Negotiate a matching IKE policy between IPsec peers to protect the IKE exchange.
To display information about neighbors, use the show cdp neighbors privileged EXEC command. (Optional) Type of the interface connected to the neighbors about which you want information. (Optional) Number of the interface connected to the neighbors about which you want information.
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