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This chapter contains the following sections:
Use the ip dhcp relay enable Global Configuration mode command to enable the DHCP relay feature on the device. Use the no form of this command to disable the DHCP relay feature.
ip dhcp relay enable
no ip dhcp relay enable
DHCP relay feature is disabled.
Global Configuration mode
The following example enables the DHCP relay feature on the device.
switchxxxxxx(config)# ip dhcp relay enable
Use the ip dhcp relay enable Interface Configuration mode command to enable the DHCP relay feature on an interface. Use the no form of this command to disable the DHCP relay agent feature on an interface.
ip dhcp relay enable
no ip dhcp relay enable
Disabled
Interface Configuration mode
The operational status of DHCP Relay on an interface is active if one of the following conditions exist:
DHCP Relay is globally enabled, and there is an IP address defined on the interface.
Or
DHCP Relay is globally enabled, there is no IP address defined on the interface, the interface is a VLAN, and option 82 is enabled.
The following example enables DHCP Relay on VLAN 21.
switchxxxxxx(config)# interface vlan 21
switchxxxxxx(config-if)# ip dhcp relay enable
Use the ip dhcp relay address Global Configuration mode command to define the DHCP servers available for the DHCP relay. Use the no form of this command to remove the server from the list.
ip dhcp relay address ip-address
no ip dhcp relay address [ip-address]
ip-address—Specifies the DHCP server IP address. Up to 8 servers can be defined.
No server is defined.
Global Configuration mode
Use the ip dhcp relay address command to define a global DHCP Server IP address. To define a few DHCP Servers, use the command a few times.
To remove a DHCP Server, use the no form of the command with the ip-address argument.
The no form of the command without the ip-address argument deletes all global defined DHCP servers.
The following example defines the DHCP server on the device.
switchxxxxxx(config)# ip dhcp relay address 176.16.1.1
Use the show ip dhcp relay EXEC mode command to display the DHCP relay information.
show ip dhcp relay
User EXEC mode
Option 82 is disabled:
switchxxxxxx# show ip dhcp relay
DHCP relay is globally disabled
Option 82 is disabled
Maximum number of supported VLANs without IP Address: 0
Number of DHCP Relays enabled on VLANs without IP Address: 4
DHCP relay is enabled on Ports: gi1/0/1,po1-2
Active:
Inactive: gi1/0/1, po1-4
DHCP relay is enabled on VLANs: 1, 2, 4, 5
Active:
Inactive: 1, 2, 4, 5
Global Servers: 1.1.1.1 , 2.2.2.2
Option 82 is enabled:
switchxxxxxx# show ip dhcp relay
DHCP relay is globally enabled
Option 82 is enabled
Maximum number of supported VLANs without IP Address is 4
Number of DHCP Relays enabled on VLANs without IP Address: 2
DHCP relay is enabled on Ports: gi1/0/1,po1-2
Active: gi1/0/1
Inactive: po1-2
DHCP relay is enabled on VLANs: 1, 2, 4, 5
Active: 1, 2, 4, 5
Inactive:
Global Servers: 1.1.1.1 , 2.2.2.2
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