DHCP Configuration 97
DHCP Relay
Configuration
DHCP relay configuration is described in the followng sections:
■ Configuring the IP address for the DHCP server
■ Configuring the DHCP Server Group for the VLAN Interfaces
■ Configuring the User Address Entry for the DHCP Server Group
■ Enabling/Disabling the DHCP Security Feature on the VLAN interface
Note:
■ After you have configured DHCP Relay, the Switch automatically configure
UDP-Helper whether the Switch is a single unit or in a fabric. The UDP-Helper
configuration remains when you remove the DHCP Relay configuration.
■ If you remove UDP-Helper configuration when the DHCP Relay configuration
still remains, the Switch will display the following prompt
This may result in
DHCP Relay errors
, and you will need to confirm if you really want to remove
the UDP-Helper configuration.
Configuring the IP address for the DHCP server
You can configure a master and a backup DHCP server, which are in the same
DHCP server group, in the same network segment to ensure reliability.
Perform the following configuration in System View.
By default, no IP address is configured for the DHCP server.
Note that you must configure an IP address for the backup DHCP server together
with that of the master server.
Configuring the DHCP Server Group for the VLAN Interfaces
Perform the following configuration in VLAN Interface View.
By default, no DHCP server corresponds to VLAN interfaces.
When associating a VLAN interface to a new DHCP server group, you can
configure the association without disassociating it from the previous group.
Tab le 90 Configuring the IP Address for the DHCP Server
Operation Command
Configure IP address for DHCP server dhcp-server
groupNo
ip
ipaddress1
[
ipaddress2
]
Delete all DHCP server IP addresses (set
the IP addresses of master and backup
DHCP servers to 0)
undo dhcp-server
groupNo
Tab le 91 Configuring the DHCP Server Group Corresponding to VLAN Interfaces
Operation Command
Configure DHCP server group corresponding to VLAN
interfaces
dhcp-server
groupNo
Delete DHCP server group undo dhcp-server
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