Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1742)

DHCP for IPv6 (DHCPv6) Introduction and Configuration
Software Reference for x310 Series Switches
65.6 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
DHCPv6 Renewal and Rebinding
See the below list of descriptions for DHCPv6 Renewal and Rebinding terminology:
■ T1 Timer:
Indicates when a DHCPv6 Client must attempt to renew IPv6 addresses or prefixes.
■ T2 Timer:
Indicates when a DHCPv6 Client must attempt to rebind IPv6 addresses or prefixes.
■ Preferred Lifetime:
Indicates when preferred IPv6 addresses or prefixes are available to interfaces for
unrestricted use and are deprecated when the preferred timer expires. Deprecated
addresses and prefixes are available for use and are discouraged but not forbidden. A
deprecated address or prefix should not be used as a source address or prefix, but
packets sent from deprecated addresses or prefixes are delivered as expected.
■ Valid Lifetime:
Indicates when IPv6 addresses or prefixes must be abandoned. An IPv6 address or
prefix becomes invalid and is not available to an interface when the valid lifetime
timer expires. Invalid addresses or prefixes should not appear as the source or
destination for a packet.
■ Client States:
« Bound: Normal operation.
« Renewing: Renewing lease.
« Rebinding: Occurs when no reply has been received from the DHCPv6 Server.
« Bound: Receive, process, and finalize new lease.
■ Renewal Process:
« Renewal T1 Timer expires (the default T1 Timer period is 50% of the lease length)
« DHCPv6 Client transitions from Bound to Renewing state.
« DHCPv6 Client sends DHCPv6 Request/Renew messages
(REQUEST/RENEW message types)
« DHCPv6 Client transitions to Rebinding state
(If no reply from DHCPv6 Server and the T2 Timer expires).
« DHCPv6 Client transitions to Bound state
(When DHCPv6 Client receives a reply from DHCPv6 Server).