Huawei Quidway S6500 Series Operation Manual page 107

Operation Manual - Network Protocol
Quidway S6500 Series Ethernet Switches
DHCP client
DHCP client
Figure 5-2 DHCP Relay typical application
DHCP Relay work on this principle:
In the startup and DHCP initialization, DHCP Client advertises configuration
request messages to the local network.
If there is a DHCP Server in the local network, you can initiate DHCP configuration
directly, with DHCP Relay unnecessary.
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.
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.
5.2 Configuring DHCP Relay
DHCP relay configuration includes:
Configuring the IP Address of a DHCP Server
Configuring the Corresponding DHCP Server Group of the VLAN Interface
Configuring the Address Table Entry
Enabling/disabling DHCP security features
Activating/Deactivating DHCP Relay Dynamic Entries
Allow/Inhibit the Passing of Unknown Machines through DHCP Security Check
5.2.1 Configuring the IP Address of a DHCP Server
To enhance reliability, you can set two DHCP servers on a network segment, forming a
DHCP server group. These two servers can be specified as primary and backup on the
DHCP servers.
Perform the following configuration in System view.
DHCP client
Ethernet
Switch ( DHCP Rel
DHCP client
Huawei Technologies Proprietary
Internet
ay)
DHCP Server
5-2
Chapter 5 DHCP Configuration