CLI Reference Guide-R04

Chapter 30 | DHCP Commands
DHCP Server
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Command Mode
DHCP Pool Configuration
Usage Guidelines
◆ Host addresses must fall within the range specified for an existing network
pool.
◆ When a client request is received, the switch first checks for a network address
pool matching the gateway where the request originated (i.e., if the request
was forwarded by a relay server). If there is no gateway in the client request (i.e.,
the request was not forwarded by a relay server), the switch searches for a
network pool matching the interface through which the client request was
received. It then searches for a manually configured host address that falls
within the matching network pool.
◆ When searching for a manual binding, the switch compares the client identifier
for DHCP clients, and then compares the hardware address for DHCP or BOOTP
clients.
◆ If no manual binding has been specified for a host entry with the client-
identifier or hardware-address commands, then the switch will assign an
address from the matching network pool.
◆ If the mask is unspecified, DHCP examines its address pools. If no mask is found
in the pool database, the Class A, B, or C natural mask is used (see page 884).
This command is valid for manual bindings only.
◆ The no host command only clears the address from the DHCP server database.
It does not cancel the IP address currently in use by the host.
Example
Console(config-dhcp)#host 10.1.0.21 255.255.255.0
Console(config-dhcp)#
Related Commands
client-identifier (878)
hardware-address (881)
lease This command configures the duration that an IP address is assigned to a DHCP
client. Use the no form to restore the default value.
Syntax
lease {days [hours] [minutes] | infinite}
no lease