IP Security VPN Monitoring  [Support] (2024)

The Per-IKE Peer Description function allows you to enter a description of your choosing for an IKE peer. (Before Cisco IOS Release 12.3(4)T, you could use only the IP address or fully qualified domain name [FQDN] to identify the peer; there was no way to configure a description string.) The unique peer description, which can include up to 80 characters, can be used whenever you are referencing that particular IKE peer. To add the peer description, use the description command.

Note	IKE peers that "sit" behind a Network Address Translation (NAT) device cannot be uniquely identified; therefore, they have to share the same peer description.

The primary application of this description field is for monitoring purposes (for example, when using show commands or for logging [syslog messages]). The description field is purely informational (for example, it cannot act as a substitute for the peer address or FQDN when defining crypto maps).

You can get a list of all the active VPN sessions by entering the show crypto session command. The listing will include the following:

• Interface
• IKE peer description, if available
• IKE SAs that are associated with the peer by whom the IPSec SAs are created
• IPSec SAs serving the flows of a session

Multiple IKE or IPSec SAs may be established for the same peer (for the same session), in which case IKE peer descriptions will be repeated with different values for the IKE SAs that are associated with the peer and for the IPSec SAs that are serving the flows of the session.

You can also use the show crypto session detail variant of this command to obtain more detailed information about the sessions.

The Syslog Notification for Crypto Session Up or Down Status function provides syslog notification every time the crypto session comes up or goes down.

The following is a sample syslog notification showing that a crypto session is up:

%CRYPTO-5-SESSION_STATUS: Crypto session is UP. Peer 10.6.6.1:500 fvrf=name10 ivrf=name20 Description: SJC24-2-VPN-Gateway Id: 10.5.5.2

The following is a sample syslog notification showing that a crypto session is down:

%CRYPTO-5-SESSION_STATUS: Crypto session is DOWN. Peer 10.6.6.1:500 fvrf=name10 ivrf=name20 Description: SJC24-2-VPN-Gateway Id: 10.5.5.2 

In previous IOS versions, there was no single command to clear both IKE and IPSec connections (that is, SAs). Instead, you had to use the clear crypto isakmp command to clear IKE and the clear crypto ipsec command to clear IPSec. The new clear crypto session command allows you to clear both IKE and IPSec with a single command. To clear a specific crypto session or a subset of all the sessions (for example, a single tunnel to one remote site), you need to provide session-specific parameters, such as a local or remote IP address, a local or remote port, a front door VPN routing and forwarding (FVRF) name, or an inside VRF (IVRF) name. Typically, the remote IP address will be used to specify a single tunnel to be deleted.

If a local IP address is provided as a parameter when you use the clear crypto session command, all the sessions (and their IKE SAs and IPSec SAs) that share the IP address as a local crypto endpoint (IKE local address) will be cleared. If you do not provide a parameter when you use the clear crypto session command, all IPSec SAs and IKE SAs that are in the router will be deleted.

SUMMARY STEPS

1. enable

2. configure terminal

3. crypto isakmp peer {ip-addressip-address}

4. description

DETAILED STEPS

SUMMARY STEPS

1. enable

2. show crypto isakmp peer

DETAILED STEPS

Router# show crypto isakmp peerPeer: 10.2.2.9 Port: 500 Description: connection from site A flags: PEER_POLICY

%CRYPTO-5-SESSION_STATUS: Crypto tunnel is UP. Peer 10.2.2.9:500 Description: connection from site A Id: ezvpn

Router# show crypto isakmp peerPeer: 10.2.2.9 Port: 500 Description: connection from site A flags: PEER_POLICY

%CRYPTO-5-SESSION_STATUS: Crypto tunnel is UP. Peer 10.2.2.9:500 Description: connection from site A Id: ezvpn

SUMMARY STEPS

1. enable

2. clear crypto session

DETAILED STEPS

Related Documents

MIBs

Technical Assistance

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.