The above message corresponds to receiving the acknowledge (ACK) message from the peer. The above message corresponds to sending the DPD R_U_THERE message. To see that IKE DPD is enabled (and that the peer supports DPD): when periodic DPD is enabled, you should see the followingĭebug messages at the interval specified by the command: The following sample output from the debug crypto isakmp command verifies that IKE DPD is enabled: Using the IPsec Dead Peer Detection Periodic Message Option On the other hand, if the router has traffic to send to the peer, and the peerĭoes not respond, the router will initiate a DPD message to determine the state of the peer. Is not trying to communicate with the peer). Out until the IKE or IPsec security association (SA) has to be rekeyed (the liveliness of the peer is unimportant if the router If a peer is dead, and the router never has any traffic to send to the peer, the router will not find If a router has no traffic to send, it never Questionable, the router sends a DPD message to query the status of the peer.
For example, if a router has to send outbound traffic and the liveliness of the peer is The contrasting on-demand approach is the default. Peers must encrypt and decrypt more packets.ĭPD also has an on-demand approach. The result of sending frequent messages is that the communicating Messages that have to be sent with considerable frequency. However, IOS keepalives and periodic DPD rely on periodic IOS keepalives and periodic DPD is earlier detection of dead peers.
If the timer is set for 10 seconds, the router will sendĪ “hello” message every 10 seconds (unless, of course, the router receives a “hello” message from the peer). DPD and Cisco IOS XE keepalives function on the basis of the timer.
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