3Com 4500 PWR 26-Port Configuration Manual page 460

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
39-7
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.