H3C Technologies H3C S3100 Series Switches - Manual (Page 507)

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address, the DHCP server searches for the IP address corresponding to the MAC address of the DHCP
client and assigns the IP address to the DHCP client.
When some DHCP clients send DHCP-DISCOVER packets to the DHCP server to apply for IP
addresses, they construct client IDs and add them in the DHCP-DISCOVER packets. If the bindings of
client IDs and IP addresses are configured on the DHCP server, when such a client requests an IP
address, the DHCP server will find the corresponding IP address based on the client ID and assign it to
the DHCP client.
Currently, only one IP address in a global DHCP address pool can be statically bound to a MAC address
or a client ID.
Follow these steps to configure the static IP address allocation mode:
To do… Use the command… Remarks
Enter system view system-view —
Enter DHCP address pool view
dhcp server ip-pool
pool-name
—
Configure an IP address to be statically
bound static-bind ip-address
ip-address [ mask mask ]
Required
By default, no IP
address is statically
bound.
Configure the MAC
address to which the IP
address is to be
statically bound
static-bind mac-address
mac-address
Bind an IP
address to the
MAC address
of a DHCP
client or a
client ID
statically
Configure the client ID
to which the IP address
is to be statically bound
static-bind client-identifier
client-identifier
One of these two
options is required
By default, no MAC
address or client ID to
which an IP address is
to be statically bound is
configured.
z The static-bind ip-address command and the static-bind mac-address command or the static-bind
client-identifier command must be coupled.
z In the same global DHCP address pool, if you configure the static-bind client-identifier command
after configuring the static-bind mac-address command, the new configuration overwrites the
previous one, and vice versa.
z In the same global DHCP address pool, if the static-bind ip-address command, the static-bind
mac-address command, or the static-bind client-identifier is executed repeatedly, the new
configuration overwrites the previous one.
z The IP address to be statically bound cannot be an interface IP address of the DHCP server;
otherwise static binding does not take effect.
z A client can permanently use the statically-bound IP address that it has obtained. The IP address is
not limited by the lease time of the IP addresses in the address pool.