H3C Technologies H3C S10500 Series Switches - Manual (Page 73)

62
Follow these steps to configure the DHCP relay agent to send DHCP-RELEASE messages:
To do… Use the command… Remarks
Enter system view system-view —
Configure the DHCP relay agent to release an
IP address
dhcp relay release ip client-ip Required
NOTE:
•
The IP address to be released must be available in a dynamic client entry.
• Dynamic client entries can be generated only after you enable address check, or IP source guard on the
DHCP relay agent. For more information about IP source guard, see the
Security Configuration Guide.
Configuring the DHCP relay agent to support
Option 82
Configuration guidelines
• To support Option 82, perform related configuration on both the DHCP server and relay agent. See
the chapter “DHCP server configuration” for DHCP server configuration of this kind.
• If the handling strategy of the DHCP relay agent is configured as replace, you must configure a
padding format for Option 82. If the handling strategy is keep or drop, you need not configure any
padding format.
• If sub-option 1 (node identifier) of Option 82 is padded with the device name (sysname) of a node,
the device name must contain no spaces. Otherwise, the DHCP relay agent will drop the message.
Configuration prerequisites
Before performing this configuration, complete the following tasks:
• Enable DHCP.
• Enable the DHCP relay agent on the specified interface.
• Correlate a DHCP server group with relay agent interfaces.
Configuration procedure
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.