HPE FlexNetwork HSR6800 Security Command Reference page 341

Use undo time-out to restore the default.
Syntax
time-out time-out
undo time-out
Views
IKE DPD view
Default command level
2: System level
Parameters
time-out: Specifies the DPD packet retransmission interval in seconds, in the range of 1 to 60.
Usage guidelines
The default DPD packet retransmission interval is 5 seconds.
Examples
# Set the DPD packet retransmission interval to 1 second for dpd2.
<Sysname> system-view
[Sysname] ike dpd dpd2
[Sysname-ike-dpd-dpd2] time-out 1
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