Prerequisites; Configuring Dhcp Snooping To Support Option 82 - H3C S5810 Series Operation Manual

You need to specify the ports connected to the authorized 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.
You can specify Layer 2 Ethernet interfaces and Layer 2 aggregate interfaces as trusted ports. For
details about aggregate interfaces, refer to Link Aggregation Configuration in the Access Volume.
If a Layer 2 Ethernet interface is added to an aggregation group, the DHCP snooping configuration
of the interface will not take effect. After the interface quits the aggregation group, the configuration
will be effective.

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:
Enter system view
Enter interface view
Enable DHCP snooping to support
Option 82
Configure the handling strategy for
requesting messages containing
Option 82
Configure
non-user-defined
Option 82
To do...
Configure the
padding format for
Option 82
Configure the code
type for the circuit
ID sub-option
Use the command...
system-view
interface interface-type
interface-number
dhcp-snooping
information enable
dhcp-snooping
information strategy
{ drop | keep | replace }
dhcp-snooping
information format
{ normal | verbose
[ node-identifier { mac |
sysname | user-defined
node-identifier } ] }
dhcp-snooping
information circuit-id
format-type { ascii |
hex }
2-5
Remarks
—
—
Required
Disabled by default.
Optional
replace by default.
Optional
normal by default.
Optional
By default, the code type
depends on the padding
format of Option 82. Each
field has its own code type.
This code type configuration
applies to non-user-defined
Option 82 only.