Manual

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Москва, Новозаводская ул., 18, стр. 1
231
DHCP Relay Configuration
As shown in the above figure, route switch is configured as a DHCP relay. The DHCP server
address is 10.1.1.10, the configuration steps is as follows:
Switch(config)#service dhcp
Switch(config)#interface vlan 1
Switch(Config-if-Vlan1)#ip address 192.168.1.1 255.255.255.0
Switch(Config-if-Vlan1)#exit
Switch(config)#vlan 2
Switch(Config-Vlan-2)#exit
Switch(config)#interface Ethernet 1/2
Switch(Config-Erthernet1/2)#switchport access vlan 2
Switch(Config-Erthernet1/2)#exit
Switch(config)#interface vlan 2
Switch(Config-if-Vlan2)#ip address 10.1.1.1 255.255.255.0
Switch(Config-if-Vlan2)#exit
Switch(config)#ip forward-protocol udp bootps
Switch(config)#interface vlan 1
Switch(Config-if-Vlan1)#ip help-address 10.1.1.10
Switch(Config-if-Vlan1)#exit
Note: It is recommended to use the combination of command ip forward-protocol udp <port>
and ip helper-address <ipaddress>. ip help-address can only be configured for ports on layer 3
and cannot be configured on layer 2 ports directly.
Scenario 3:
DHCP Server
10.1.1.10
DHCP Client
DHCP Client
DHCP Client
E1/1
192.168.1.1
DHCP Relay
E1/2
10.1.1.1