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DHCP Relay 73
Figure 20 DHCP Relay Schematic Diagram
When the DHCP Client performs initialization, it broadcasts the request packet on
the local network segment. If there is a DHCP server on the local network segment
(e.g. the Ethernet on the right side of the figure), then the DHCP can be
configured directly without the relay. If there is no DHCP server on the local
network segment, DHCP relay will process the received broadcast packets and
forward them to remote DHCP servers. The server configures the clients based on
the information provided in the DHCP request packet and in the server setup.
Then the server transmits the configuration information to the clients through the
DHCP relay, thereby, completing the dynamic configuration of the client.
Configuring DHCP is described in the following sections:
■ Configuring DHCP Relay
■ Troubleshooting a DHCP Relay Configuration
Configuring DHCP Relay DHCP relay configuration includes tasks described in the following sections:
■ Configuring a DHCP Server IP Address in a DHCP Server Group
■ Configuring the DHCP Server Group for the VLAN Interface
■ Configuring the Address Table Entry
■ Enabling/Disabling DHCP Security Features
■ Displaying and Debugging DHCP Relay
The server IP address is associated , through its DHCP server group, with a specific
VLAN interface. This implementation differs from others in which the server IP is a
global parameter.
Configuring a DHCP Server IP Address in a DHCP Server Group
Perform the following configuration in System view.
DHCP clients
DHCP clients
Switch
Switch
Intranet
Intranet
DHCP client
DHCP client
DHCP server
DHCP server
Ethernet
Ethernet
Ethernet
Ethernet
Table 69 Configure/Delete the IP Address of the DHCP Server
Operation Command
Configure the IP address for a DHCP Server dhcp-server groupNo ip ipaddress1
[ ipaddress2 ]