H3C S3100 Series Operation Manual page 507

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...
Enter system view
Enter DHCP address pool view
Configure an IP address to be statically
bound
Configure the MAC
Bind an IP
address to which the IP
address to the
address is to be
MAC address
statically bound
of a DHCP
client or a
Configure the client ID
client ID
to which the IP address
statically
is to be statically bound
The static-bind ip-address command and the static-bind mac-address command or the static-bind
client-identifier command must be coupled.
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.
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.
The IP address to be statically bound cannot be an interface IP address of the DHCP server;
otherwise static binding does not take effect.
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.
Use the command...
system-view
dhcp server ip-pool
pool-name
static-bind ip-address
ip-address [ mask mask ]
static-bind mac-address
mac-address
static-bind client-identifier
client-identifier
2-6
Remarks
—
—
Required
By default, no IP
address is statically
bound.
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.