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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 22 Configuring DHCP Features and IP Source Guard
Configuring DHCP Server Port-Based Address Allocation
Beginning in privileged EXEC mode follow these steps to preassign an IP address and to associate it to
a client identified by the interface name.
To disable DHCP port-based address allocation, use the
no ip dhcp use subscriber-id client-id
global
configuration command. To disable the automatic generation of a subscriber identifier, use the
no ip
dhcp subscriber-id interface-name
global configuration command. To disable the subscriber identifier
on an interface, use the
no ip dhcp server use subscriber-id client-id
interface configuration command.
To remove an IP address reservation from a DHCP pool, use the
no address
ip-address
client-id
string
DHCP pool configuration command. To change the address pool to nonrestricted, enter the
no
reserved-only
DHCP pool configuration command.
In this example, a subscriber identifier is automatically generated, and the DHCP server ignores any
client identifier fields in the DHCP messages and uses the subscriber identifier instead. The subscriber
identifier is based on the short name of the interface and the client preassigned IP address 10.1.1.7.
switch#
show running config
Building configuration...
Current configuration : 4899 bytes
!
version 12.2
!
hostname switch
!
no aaa new-model
clock timezone EST 0
ip subnet-zero
ip dhcp relay information policy removal pad
no ip dhcp use vrf connected
ip dhcp use subscriber-id client-id
ip dhcp subscriber-id interface-name
ip dhcp excluded-address 10.1.1.1 10.1.1.3
!
ip dhcp pool dhcppool
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
ip dhcp pool
poolname
Enter DHCP pool configuration mode, and define the
name for the DHCP pool. The pool name can be a
symbolic string (such as Engineering) or an integer
(such as 0).
Step 3
network
network-number
[
mask
|
/prefix-length
]
Specify the subnet network number and mask of the
DHCP address pool.
Step 4
address
ip-address
client-id
string
[
ascii
]
Reserve an IP address for a DHCP client identified by
the interface name.
string
—can be an ASCII value or a hexadecimal
value.
Step 5
reserved-only
(Optional) Use only reserved addresses in the DHCP
address pool. The default is to not restrict pool
addresses.
Step 6
end
Return to privileged EXEC mode.
Step 7
show ip dhcp pool
Verify DHCP pool configuration.
Step 8
copy running-config startup-config
(Optional) Save your entries in the configuration file.
