497
Use
undo pfs
to restore the default.
Syntax
In non-FIPS mode:
pfs
{
dh-group1
|
dh-group2
|
dh-group5
|
dh-group14
|
dh-group24
|
dh-group19
|
dh-group20
}
undo
pfs
In FIPS mode:
pfs
{
dh-group14
|
dh-group19
|
dh-group20
}
undo pfs
Default
The PFS feature is disabled for the IPsec transform set.
Views
IPsec transform set view
Predefined user roles
network-admin
Parameters
dh-group1
: Uses 768-bit Diffie-Hellman group.
dh-group2
: Uses 1024-bit Diffie-Hellman group.
dh-group5
: Uses 1536-bit Diffie-Hellman group.
dh-group14
: Uses 2048-bit Diffie-Hellman group.
dh-group24
: Uses 2048-bit and 256-bit subgroup Diffie-Hellman group.
dh-group19
: Uses 256-bit ECP Diffie-Hellman group. This keyword is available only for IKEv2.
dh-group20
: Uses 384-bit ECP Diffie-Hellman group. This keyword is available only for IKEv2.
Usage guidelines
In terms of security and necessary calculation time, the following groups are in descending order:
384-bit ECP Diffie-Hellman group (
dh-group20
), 256-bit ECP Diffie-Hellman group (
dh-group19
),
2048-bit and 256-bit subgroup Diffie-Hellman group (
dh-group24
), 2048-bit Diffie-Hellman group
(
dh-group14
), 1536-bit Diffie-Hellman group (
dh-group5
), 1024-bit Diffie-Hellman group
(
dh-group2
), and 768-bit Diffie-Hellman group (
dh-group1
).
The security level of the Diffie-Hellman group of the initiator must be higher than or equal to that of
the responder.
The end without the PFS feature performs IKE negotiation according to the PFS requirements of the
peer end.
Examples
# Enable PFS using 2048-bit Diffie-Hellman group for IPsec transform set
tran1
.
<Sysname> system-view
[Sysname] ipsec transform-set tran1
[Sysname-ipsec-transform-set-tran1] pfs dh-group14
protocol
Use
protocol
to specify a security protocol for an IPsec transform set.
Summary of Contents for FlexNetwork MSR Series
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