H3C Technologies H3C S12500-X Series Switches - Manual (Page 42)

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