H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 72)

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NOTE:
•
You must 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 Ethernet interfaces and aggregate interfaces as trusted ports. For more information
about aggregate interfaces, see the
Layer 2—LAN Switching Configuration Guide.
• If an 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.
• Do not configure DHCP snooping and QinQ on the same device; otherwise, DHCP snooping may not
work.
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 interface view
interface interface-type
interface-number
—
Enable DHCP snooping to support
Option 82 dhcp-snooping information
enable Required
Disabled by default.
Configure the handling strategy for
requests containing Option 82
dhcp-snooping information
strategy { append | drop | keep |
replace }
Optional
replace by default.
Configure
non-user-defined
Option 82
Configure the
padding format for
Option 82
dhcp-snooping information
format { normal | private private
| standard | verbose
[ node-identifier { mac | sysname
| user-defined node-identifier } ] }
Optional
normal by default.
Configure the code
type for the circuit
ID sub-option
dhcp-snooping information
circuit-id format-type { ascii |
hex }
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.
Configure the code
type for the remote
ID sub-option
dhcp-snooping information
remote-id format-type { ascii |
hex }
Optional
hex by default.
The code type configuration
applies to non-user-defined
Option 82 only.