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4-160
Command Usage
This command is used to configure DHCP relay functions for host
devices attached to the switch. If DHCP relay service is enabled, and this
switch sees a DHCP request broadcast, it inserts its own IP address into
the request so the DHCP server will know the subnet where the client is
located. Then, the switch forwards the packet to the DHCP server on
another network. When the server receives the DHCP request, it allocates
a free IP address for the DHCP client from its defined scope for the
DHCP client’s subnet, and sends a DHCP response back to the DHCP
relay agent (i.e., this switch). This switch then broadcasts the DHCP
response received from the server to the client.
Example
In the following example, the device is reassigned the same address.
Related Commands
ip dhcp relay server (4-160)
ip dhcp relay server
This command specifies the addresses of DHCP servers to be used by the
switch’s DHCP relay agent. Use the no form to clear all addresses.
Syntax
ip dhcp relay server address1 [address2 [address3 ...]]
no ip dhcp relay server
address - IP address of DHCP server. (Range: 1-3 addresses)
Default Setting
None
Console(config)#interface vlan 1
Console(config-if)#ip dhcp relay
Console(config-if)#end
Console#show ip interface
Vlan 1 is up, addressing mode is Dhcp
Interface address is 10.1.0.254, mask is 255.255.255.0, Primary
MTU is 1500 bytes
Proxy ARP is disabled
Split horizon is enabled
Console#