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    DHCPv6 Lease Timers

    Subscriber management supports configurable timers that you can use to manage the DHCPv6 address leases provided by address-assignment pools. In addition to the maximum-lease-time timer, which sets the maximum time for which the DHCPv6 server can grant a lease, you can use DHCP client-specific attributes to configure timers that govern the lifetimes of existing leases that have been obtained from an address-assignment pool.

    The following list describers the configurable timers for DHCPv6 address-assignment pools:

    • preferred-lifetime—Length of time that a valid address is in the preferred state and can be used without any restrictions. When the preferred-lifetime expires, the address becomes deprecated. A deprecated address should not be used for new communications, but might continue to be used for existing communications in certain cases.

      If the valid-lifetime is also configured, the preferred-lifetime must be less than the valid-lifetime. The preferred-lifetime and the maximum-lease-time are mutually exclusive and cannot both be configured.

    • valid-lifetime—Length of time that an address remains in the valid state, during which the address can be used for new or existing communications. When the valid-lifetime expires, the address becomes invalid, and can no longer be used.

      If the preferred-lifetime is also configured, the valid-lifetime must be greater than the preferred-lifetime. The valid-lifetime and the maximum-lease-time are mutually exclusive and cannot both be configured.

    • t1 percentage—Percentage of the preferred-lifetime that the client waits before contacting the DHCPv6 server that originally granted the lease to request that the address lease be extended. This timer is also called the renewal time.
    • t2 percentage—Percentage of the preferred-lifetime that the client waits before sending a request to any available DHCPv6 server to extend the address lease. This timer is also called the rebind time.

    Modified: 2016-04-20