3Com Switch 8800 Configuration Guide Chapter 13 DHCP Configuration
13-22
z After receiving the packet, the DHCP server generates configuration information
accordingly and sends it to the DHCP client through the DHCP Relay to complete
the dynamic configuration of the DHCP client.
Note that the entire configuration procedure may goes through multiples times of such
interactions.
13.4.2 Configuring DHCP Relay DHCP Relay configuration includes the following: The following text describes the
DHCP Relay configuration tasks:
z Configuring a DHCP server for a VLAN interface
z Configure user address entries for a DHCP Server
z Enable/Disable DHCP security on a VLAN interface
z Enabling/Disabling fake DHCP server detecting
I. Configuring a DHCP server for a VLAN interface
You can execute the ip relay address command to configure the DHCP packet
processing mode on VLAN interface as relay and a corresponding DHCP server for a
VLAN interface.
Perform the following configuration in VLAN interface view.
Table 13-33 Configure a corresponding DHCP server for a VLAN interface
Operation Command
Configure a corresponding DHCP server
for current VLAN interface ip relay address ip_address
Remove the DHCP server configured for
current VLAN interface undo ip relay address { ip_address |
all }
No DHCP server is configured for a VLAN interface by default.
Note that when configuring a new DHCP server for a VLAN that already has a DHCP
server configured for it, the newly configured one does not overwrite the existing ones.
Both the new and the old ones are valid. You can configure up to 20 DHCP server
addresses for a VLAN interface.
II. Configure user address entries for a DHCP Server
In a VLAN that has DHCP Relay configured, to enable a DHCP client using a legal fixed
IP address to pass the address checking of the DHCP security feature, you must add a
static address entry for the DHCP client. A static address entry indicates the relation
between a fixed IP address and a MAC address.
Perform the following configuration in system view.