H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 387)

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With this feature enabled, upon receiving a DHCP request, the DHCP relay agent will record the IP
address of the DHCP server which assigned an IP address to the DHCP client and the receiving
interface. The administrator can use this information to check out any DHCP unauthorized servers.
Follow these steps to enable unauthorized DHCP server detection:
To do… Use the command… Remarks
Enter system view system-view —
Enable unauthorized DHCP server
detection
dhcp relay server-detect
Required
Disabled by default.
With the unauthorized DHCP server detection enabled, the device puts a record once for each DHCP
server. The administrator needs to find unauthorized DHCP servers from the log information. After the
recorded information of a DHCP server is cleared, a new record will be put for the DHCP server.
Configuring the DHCP Relay Agent to Support Option 82
Prerequisites
You need to complete the following tasks before configuring the DHCP relay agent to support Option 82.
z
Enabling DHCP
z
Enabling the DHCP relay agent on the specified interface
z
Correlating a DHCP server group with relay agent interfaces
Configuring the DHCP relay agent to support Option 82
Follow these steps to configure the DHCP relay agent to support Option 82:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable the relay agent to support
Option 82
dhcp relay information enable
Required
Disabled by default.
Configure the handling strategy for
requesting messages containing
Option 82
dhcp relay information strategy
{ drop | keep | replace }
Optional
replace by default.
Configure the padding format for
Option 82
dhcp relay information format
{ normal | verbose
[ node-identifier { mac | sysname
| user-defined node-identifier } ] } Optional
normal by default.