Operation Manual - Network Protocol
Quidway S3500 Series Ethernet Switches Chapter 4 DHCP Relay Configuration
Huawei Technologies Proprietary
4-2
DHCP Relay work on this principle:
z In the startup and DHCP initialization, DHCP Client advertises configuration
request messages to the local network.
z If there is a DHCP Server in the local network, you can initiate DHCP configuration
directly, with DHCP Relay unnecessary.
z Otherwise, when a device with DHCP Relay enabled which is connected with the
local network receives the messages, it will make necessary processing and
forward them to the designated DHCP Server on other network.
z DHCP Server makes configurations according to the information from DHCP
Client and sends the configuration result via DHCP Relay back to DHCP Client.
In practice, several times of interaction behaviors may be required in the dynamic
configuration of DHCP Client.
4.2 Configure DHCP Relay
DHCP relay configuration includes:
z Configure IP Address of a DHCP Server
z Configure Corresponding DHCP Server Group of the VLAN Interface
z Configure the Address Table Entry
z Enable/Disable DHCP security features
z Enable/Disable DHCP pseudo-server detection
4.2.1 Configure IP Address of a DHCP Server
Perform the following configuration in System view.
Table 4-1 Configure/Delete the IP address of the DHCP Server
Operation Command
Configure the IP address of the DHCP
Server
dhcp-server groupNo ip ipaddress1
[ ipaddress2 ]
Remove all the IP addresses of the
DHCP Server (namely, set the IP
addresses of the primary and secondary
DHCP Servers to 0)
undo dhcp-server groupNo
Note that the backup DHCP Server IP address cannot be configured independently,
instead, it has to be configured together with the master DHCP Server IP address.
By default, the corresponding IP address of the DHCP Server is not configured. That is,
The DHCP Server address must be configured before DHCP relay can be used.
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