Applying An Extended Address Pool On An Interface; Configuring The Dhcp Server Security Functions; Configuration Prerequisites - HP A5120 EI Series Configuration Manual

NOTE:
If a DHCP relay agent exists between the DHCP server and client, the DHCP server, regardless of
whether the subaddress keyword is used, will select an IP address from the address pool containing the
primary IP address of the DHCP relay agent's interface (connected to the client) for a requesting client.
When the DHCP server and client are on the same subnet:

With the keyword subaddress specified, the DHCP server will preferably assign an IP address from an address
pool that resides on the same subnet as the primary IP address of the server interface (connecting to the client). If
the address pool contains no assignable IP address, the server assigns an IP address from an address pool that
resides on the same subnet as the secondary IP addresses of the server interface. If the interface has multiple
secondary IP addresses, each address pool is tried in turn for address allocation. If the interface has no
secondary IP addresses, the server is unable to assign an IP address to the client.

Without the keyword subaddress specified, the DHCP server can only assign an IP address from the address
pool that resides on the same subnet as the primary IP address of the server interface.

Applying an extended address pool on an interface

After you create an extended address pool and apply it on an interface, a DHCP server, upon receiving a
client's request on the interface, attempts to assign the client the statically bound IP address first and then
an IP address from the specified address pool. If no IP address is available in this address pool, address
allocation fails, and the DHCP server will not assign the client any IP address from other address pools.
Follow these steps to apply an extended address pool on an interface:
To do...
Enter system view
Enter interface view
Apply an extended address
pool on the interface
NOTE:
Only an extended address pool can be applied on the interface. The address pool to be referenced
must already exist.

Configuring the DHCP server security functions

Configuration prerequisites

Before performing this configuration, complete the following configurations on the DHCP server:
Enable DHCP.

Configure the DHCP address pool.

Use the command...
system-view
interface interface-type interface-
number
dhcp server apply ip-pool pool-
name
41
Remarks
—
—
Optional
By default, the DHCP server has no
extended address pool applied on its
interface, and assigns an IP address
from a common address pool to a
requesting client.