Configuring Option 82 Supporting - Huawei Quidway S3900 Series Operation Manual

Operation Manual - DHCP
Quidway S3900 Series Ethernet Switches-Release 1510
After the pseudo DHCP server detection function is enabled on a DHCP relay, when a
DHCP client sends the DHCP-REQUEST message, the DHCP relay can obtain the IP
address of the server that assigns an IP address to the client from the message and
records the assigned IP address as well as the information of the interface receiving
the message. As a result, the administrator can find and deal with the pseudo DHCP
server.
Table 3-7 Configure pseudo-DHCP server detection function
Enter system view
Enable
server detection function

3.2.5 Configuring Option 82 Supporting

I. Prerequisites
Before configuring option 82 supporting on a DHCP relay, you need to:
Configure network parameters and relay function of the DHCP relay device.
Perform assignment strategy-related configurations, such as network parameters
of the DHCP server, address pool, and lease time.
The routes between the DHCP relay and the DHCP server are reachable.
II. Enabling option 82 supporting on a DHCP relay
The following operations need to be performed on a DHCP relay–enabled network
device.
Table 3-8 Enable option 82 supporting on a DHCP relay
Operation
Enter system view
Enable
supporting
DHCP relay
Operation
system-view
pseudo-DHCP
dhcp-server detect
Command
system-view
option 82 dhcp
on the information
enable
Huawei Technologies Proprietary
Chapter 3 DHCP Relay Configuration
Command
—
relay
Required
By default, this function is disabled
3-9
Description
—
Required
By default, the pseudo
DHCP server detection
function is disabled
Description