Ip Address Allocation Sequence; Dhcp Server Tasks At A Glance - H3C SR8800-F Configuration Manual

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
mechanisms" and
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. It does not assign the IP address that was once assigned to the client.
• Conflicted IP addresses can be assigned to other DHCP clients only after the addresses are in
conflict for an hour.

DHCP server tasks at a glance

Tasks at a glance
(Optional.) Creating a DHCP user class
(Required.)
(Required.)
(Required.)
(Optional.) Applying a DHCP address pool to a VPN instance
(Optional.) Applying an address pool on an interface
(Optional.) Configuring a DHCP policy for dynamic address assignment
(Optional.) Allocating different IP addresses to DHCP clients with the same MAC
(Optional.) Enabling random IP address allocation
(Optional.) Configuring IP address conflict detection
(Optional.) Enabling handling of Option 82
(Optional.) Disabling Option 60 encapsulation in DHCP replies
(Optional.) Configuring the DHCP server security features
(Optional.) Configuring DHCP server compatibility
(Optional.) Setting the DSCP value for DHCP packets sent by the DHCP server
(Optional.) Configuring DHCP packet rate limit on a DHCP server interface
(Optional.) Configuring DHCP binding auto backup
(Optional.) Binding gateways to DHCP server's MAC address
(Optional.) Advertising subnets assigned to clients
"Principles for selecting an address
Configuring an address pool on the DHCP server
Enabling DHCP
Enabling the DHCP server on an interface
"DHCP address assignment
pool."
97