Ip Address Allocation Sequence; Dhcp Server Configuration Task List - HPE FlexNetwork MSR Series Comware 7 Layer 3 - Ip Services Configuration Manuals

NOTE:
As a best practice, configure a minimum of one matching primary subnet in your network. Otherwise,
the DHCP server selects only the first matching secondary subnet for address allocation. If the
network has more DHCP clients than the assignable IP addresses in the secondary subnet, not all
DHCP clients can obtain IP addresses.

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. 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 configuration task list

Tasks at a glance
(Required.)
(Required.)
(Required.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(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 a DHCP policy for dynamic address assignment
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
Configuring DHCP binding auto backup
Configuring address pool usage alarming
Binding gateways to a common MAC address
Advertising subnets assigned to clients
Applying a DHCP address pool to a VPN instance
"DHCP address
42
pool."