Ip Address Allocation Sequence; Dhcp Server Configuration Task List - HP 6125XLG Layer 3-Ip Services Configuration Manual

only a secondary subnet is matched, the DHCP server does not select any IP address from other
secondary subnets when the matching secondary subnet has no assignable addresses.
NOTE:
To make sure correct address allocation, keep the IP addresses used for dynamic allocation in the subnet
where the interface of the DHCP server or DHCP relay agent resides as possible as you can.

IP address allocation sequence

The DHCP server selects an IP address for a client in the following sequence:
1. IP address statically bound to the client's MAC address or ID.
2. IP address that was ever assigned to the client.
3. IP address designated by the Option 50 field in the DHCP-DISCOVER message sent by the client.
Option 50 is the Requested IP Address option. The client uses this option to specify the wanted IP
address in a DHCP-DISCOVER message. The content of Option 50 is user defined.
4. First assignable IP address found in the way discussed in
5. IP address that was a conflict or passed its lease duration. If no IP address is assignable, the server
does not respond.
NOTE:
If a client moves to another subnet, the DHCP server selects an IP address in the address pool matching the
new subnet instead of assigning the IP address that was once assigned to the client.

DHCP server configuration task list

Tasks at a glance
(Required.)
(Required.)
(Required.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
Configuring an address pool on the DHCP server
Enabling DHCP
Enabling the DHCP server on an interface
Applying an address pool on an interface
Configuring IP address conflict detection
Enabling handling of Option 82
Configuring DHCP server compatibility
Setting the DSCP value for DHCP packets sent by the DHCP server
"DHCP address
34
pool."