Address/Prefix Lease Renewal - HPE FlexNetwork 10500 Series Configuration Manual

Figure 66 Assignment involving four messages
DHCPv6 client

Address/prefix lease renewal

An IPv6 address/prefix assigned by a DHCPv6 server has a valid lifetime. After the valid lifetime
expires, the DHCPv6 client cannot use the IPv6 address/prefix. To use the IPv6 address/prefix, the
DHCPv6 client must renew the lease time.
Figure 67 Using the Renew message for address/prefix lease renewal
DHCPv6 client
T1
As shown in
The recommended value of T1 is half the preferred lifetime. The DHCPv6 server responds with a
Reply message, informing the client whether the lease is renewed.
Figure 68 Using the Rebind message for address/prefix lease renewal
DHCPv6 client
T1
T2
As shown in
•
If the DHCPv6 client does not receive a response from the DHCPv6 server after sending a
Renew message at T1, it multicasts a Rebind message to all DHCPv6 servers at T2. Typically,
the value of T2 is 0.8 times the preferred lifetime.
•
The DHCPv6 server responds with a Reply message, informing the client whether the lease is
renewed.
•
If the DHCPv6 client does not receive a response from any DHCPv6 server before the valid
lifetime expires, the client stops using the address/prefix.
For more information about the valid lifetime and the preferred lifetime, see
settings."
DHCPv6 server
(1) Solicit
(2) Advertise
(3) Request
(4) Reply
DHCPv6 server
(1) Renew
(2) Reply
Figure 67, at T1, the DHCPv6 client sends a Renew message to the DHCPv6 server.
DHCPv6 server
(1) Renew
...
...
(2) Rebind
(3) Reply
Figure 68:
187
"Configuring basic IPv6