preferred-lifetime (DHCPv6)
The preferred lifetime interval is 0 seconds by default.
DHCPv6 server configuration mode
DHCPv6 subnet configuration mode
Once the configured time interval expires, the IPv6 prefix is deprecated. The preferred
lifetime interval must be less than or equal to the valid lifetime interval. Refer
to the
valid-lifetime command for more information.
When configuring the DHCPv6 server using this
command along with the valid-lifetime (DHCPv6), renewal-time] (DHCPv6),
and rebind-time
(DHCPv6) commands, enter the commands in the following order:
If a preferred lifetime is not configured in DHCPv6 subnet configuration mode, the globally configured preferred lifetime is inherited.
The DHCPv6 lease expiry is calculated based on the current-time with the valid-lifetime configured, and must not exceed the value of 2147483647 seconds. The below error occurs when the preferred-lifetime configuration exceeds the allowed value:
device(config-dhcp6-subnet)# preferred-lifetime 4294967290 Error: preferred-lifetime + current-time must not exceed 2147483647 device(config-dhcp6-subnet)#
The following example sets the preferred lifetime to 200 seconds.
device# configure terminal device(config)# ipv6 dhcp6-server enable device(config-dhcp6)# preferred-lifetime 200
| Release version | Command history |
|---|---|
| 08.0.90 | This command was introduced. |