H3C Technologies H3C SecPath F1000-E - Manual (Page 51)

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To do… Use the command… Remarks
Enter system view system-view —
Enter interface view interface interface-type interface-number —
Enable the DHCP server on an
interface
dhcp select server global-pool [ subaddress ]
Optional
Enabled by default.
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.
NOTE:
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.
• 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, the 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, 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… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Apply an extended address
pool on the interface dhcp server apply ip-pool
pool-name
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.
NOTE:
Only an extended address pool can be applied on the interface. The address pool to be referenced must
already exist.