3com MSR 20-20 참조 매뉴얼

group5: Uses the 1536-bit Diffie-Hellman group for key negotiation in phase 1.

group14: Uses the 2048-bit Diffie-Hellman group for key negotiation in phase 1.

Use the dh command to specify the DH group to be used in key negotiation phase 
1 for an IKE proposal.

Use the undo dh command to restore the default.

By default, group1, the 768-bit Diffie-Hellman group, is used.

ike proposal, display ike proposal.

# Specify 768-bit Diffie-Hellman for IKE proposal 10.

<Sysname> system-view

[Sysname] ike proposal 10

[Sysname-ike-proposal-10] dh group1 

display ike dpd [ dpd-name ]

Any view

dpd-name: DPD name, a string of 1 to 15 characters.

Use the display ike dpd command to display information about a specified or all 
DPDs.

ike dpd.

# Display information about all DPDs.

<Sysname> display ike dpd

---------------------------

IKE dpd: dpd1

references: 1

interval-time: 10

time_out: 5

--------------------------- 

Table 569   Description on the fields of the display ike dpd command

references 

Number of IKE peers referencing the DPD 

Interval-time DPD 

query 

triggering interval in seconds 

time_out 

DPD packet retransmission interval in seconds