3Com Switch 4800G 24-Port Configuration Manual page 801

When the client with the MAC address or ID requests an IP address, the DHCP
server will find the IP address from the binding for the client.
A DHCP address pool now supports only one static binding, which can be a
MAC-to-IP or ID-to-IP binding.
Follow these steps to configure the static binding in a DHCP address pool:
To do...
Enter system view
Enter DHCP address pool view
Bind IP addresses statically
Bind MAC Specify the MAC
addresses or address
IDs statically
Specify the ID
n
Use the static-bind ip-address command together with static-bind
■
mac-address or static-bind client-identifier command to accomplish a
static binding configuration.
In a DHCP address pool, if you execute the static-bind mac-address
■
command before the static-bind client-identifier command, the latter will
overwrite the former and vice versa.
If you use the static-bind ip-address, static-bind mac-address, or
■
static-bind client-identifier command repeatedly in the DHCP address pool,
the new configuration will overwrite the previous one.
The IP address of the static binding cannot be an interface address of the DHCP
■
server. Otherwise, an IP address conflict may occur and the bound client cannot
obtain an IP address correctly.
The ID of the static binding must be identical to the ID displayed by using the
■
display dhcp client verbose command on the client. Otherwise, the client
cannot obtain an IP address.
Configuring dynamic address allocation
You need to specify one and only one address range using a mask for the dynamic
address allocation.
To avoid address conflicts, the DHCP server excludes IP addresses used by the GW,
FTP server and so forth from dynamic allocation.
You can specify the lease duration for a DHCP address pool different from others,
and a DHCP address pool can only have the same lease duration. A lease does not
enjoy the inheritance attribute.
Follow these steps to configure the dynamic address allocation:
Configuring an Address Pool for the DHCP Server
Use the command...
system-view
dhcp server ip-pool
pool-name
static-bind ip-address
ip-address [ mask-length |
mask mask ]
static-bind mac-address
mac-address
static-bind
client-identifier
client-identifier
801
Remarks
-
-
Required
No IP addresses are
statically bound by default.
Required to configure either
of the two
Neither is bound statically
by default.