H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 397)

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The handling strategy and padding format for Option 82 on the DHCP-Snooping device are the same as
those on the relay agent.
Configuring DHCP Snooping Basic Functions
Follow these steps to configure DHCP snooping basic functions:
To do… Use the command… Remarks
Enter system view system-view —
Enable DHCP snooping dhcp-snooping
Required
Disabled by default.
Enter Ethernet port view
interface interface-type
interface-number
—
Specify the port as trusted
dhcp-snooping trust
[ no-user-binding ]
Required
Untrusted by default.
z
You need to specify the ports connected to the valid DHCP servers as trusted to ensure that DHCP
clients can obtain valid IP addresses. The trusted port and the port connected to the DHCP client
must be in the same VLAN.
z
You are not recommended to configure both the DHCP snooping and selective Q-in-Q function on
the switch, which may result in the DHCP snooping to function abnormally.
Configuring DHCP Snooping to Support Option 82
Prerequisites
You need to enable the DHCP Snooping function before configuring DHCP Snooping to support Option
82.
Configuring DHCP Snooping to Support Option 82
Follow these steps to configure DHCP snooping to support Option 82:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Enable DHCP Snooping to support
Option 82 dhcp-snooping information
enable
Required
Disabled by default.