Here you specify the time in seconds that the client should treat this prefix as "preferred". After this time elapses, a client classifies this address as "deprecated".
- SNMP ID:
 - 2.70.3.1.3.5
 - Console path:
 - Setup > IPv6 > DHCPv6 > Server > PD-Pools
 - Possible values:
 Max. 10 characters from [0-9]
- Default:
 - 3600