H3C Technologies H3C S7500E Series Switches - Manual (Page 57)

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To do… Use the command… Remarks
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.
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:
z With the keyword subaddress specified, the DHCP server will assign an IP address from the
address pool containing the secondary IP address of the server interface (connected to the client);
if the interface has multiple secondary IP addresses, the address pool containing the first
secondary IP address is selected. If the interface has no secondary IP addresses, the server is
unable to assign an IP address to the client.
z Without the keyword subaddress specified, the DHCP server will assign an IP address from the
address pool containing the primary IP address of the server interface (connected to the client).
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.