H3C Technologies H3C SecPath F1000-E - Manual (Page 212)

187
If a client's
requesting
message has…
Handling
strategy
Padding format The DHCP relay agent will…
no Option 82
N/A normal
Forward the message after adding the
Option 82 padded in normal format.
N/A verbose
Forward the message after adding the
Option 82 padded in verbose format.
N/A user-defined
Forward the message after adding the
user-defined Option 82.
Configuring the DHCP relay agent in the web
interface
DHCP relay agent configuration task list
Complete the following tasks to configure the DHCP relay agent:
Task Remarks
Enabling DHCP and configuring
advanced parameters for the
DHCP relay agent
Required.
Enable DHCP globally and configure advanced DHCP parameters.
By default, global DHCP is disabled.
Creating a DHCP server group
Required.
To improve reliability, you can specify several DHCP servers as a group on
the DHCP relay agent and correlate a relay agent interface with the server
group. When the interface receives requesting messages from clients, the
relay agent will forward them to all the DHCP servers of the group.
Enabling the DHCP relay agent
on an interface
Required.
Enable the DHCP relay agent on an interface, and correlate the interface
with a DHCP server group.
With DHCP enabled, interfaces work in the DHCP server mode.
IMPORTANT:
• An interface cannot serve as both the DHCP server and the DHCP relay
agent. The latest configuration takes effect.
• If the DHCP relay agent is enabled on an Ethernet subinterface, a packet
received from a client on this interface must contain a VLAN tag and the
VLAN tag must be the same as the VLAN ID of the subinterface;
otherwise, the packet is discarded.
• The DHCP relay agent works on interfaces with IP addresses manually
configured only.
• If an Ethernet subinterface serves as a DHCP relay agent, it conveys IP
addresses only to subinterfaces of DHCP clients. In this case, a PC cannot
obtain an IP address as a DHCP client.