Configuring Option 82 Supporting - H3C S7500 Series Operation Manual

Operation Manual – DHCP
H3C S7500 Series Ethernet Switches
III. Configuring whether to allow freely-connected clients to pass DHCP
security check
A freely-connected client refers to the client whose IP address and MAC address are
not in the DHCP security table. When the freely-connected client is not allowed to
pass DHCP security check, you cannot access the network on this client even if the
freely-connected client has a valid IP address.
Follow these steps to configure whether to allow freely-connected clients to pass
DHCP security check:
Enter system view
Enter VLAN interface view
Forbid freely-connected
clients to pass DHCP
security check
This configuration will take effect only after the address checking function of the
DHCP relay agent on the VLAN interface is enabled.

3.2.5 Configuring Option 82 Supporting

I. Prerequisites
Before configuring option 82 supporting on a DHCP relay agent, you need to:
Configure network parameters and relay function of the DHCP relay agent.
Perform
parameters of the DHCP server, address pool, and lease time.
The routes between the DHCP relay agent and the DHCP server are reachable.
II. Enabling option 82 supporting on a DHCP relay agent
The following operations need to be performed on a DHCP relay agent–enabled
network device.
Follow these steps to enable option 82 supporting on a DHCP relay agent:
Enter system view
Enable option 82
supporting on the DHCP
relay agent
To do...
system-view
interface interface-type
interface-number
address-check
no-matched enable
assignment strategy-related
To do...
system-view
dhcp relay information
enable
Chapter 3 DHCP Relay Agent Configuration
Use the command...
configurations,
Use the command...
3-7
Remarks
—
—
Optional
Freely-connected clients
are not allowed to pass
DHCP security check
such as network
Remarks
—
Required
By default, this function is
disabled