User Manual

C HAPTER 46 | DHCP Commands
DHCP Server
– 1375 –
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 1377). 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 (1371)
hardware-address (1374)
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
days - Specifies the duration of the lease in numbers of days.
(Range: 0-364)